Two new compounds,1([Cu(IDB_)2]Cl_2·2CH_3CH_2OH·2H_2O(IDB = N,N-di(2-benzimidazolylmethyl)imine]) and 2([Cu(EDTB)]·2[C_6H_4(OH)COO]·6H_2O(EDTB = N,N,N',N'-tetrakis-[(2-benzimidazoly...Two new compounds,1([Cu(IDB_)2]Cl_2·2CH_3CH_2OH·2H_2O(IDB = N,N-di(2-benzimidazolylmethyl)imine]) and 2([Cu(EDTB)]·2[C_6H_4(OH)COO]·6H_2O(EDTB = N,N,N',N'-tetrakis-[(2-benzimidazolyl)methyl]-1,2-ethanediamine]),have been synthesized and their crystal structures were determined by single-crystal X-ray diffraction. Crystal 1 belongs to the triclinic system,space group P1 with a = 9.565(2),b = 9.863(2),c = 10.252(3) ?,α = 81.915,β = 88.330,γ = 87.347°,V = 956.28(40) ?3,Z = 1,F(000) = 427,D_c = 1.419 g/cm3,Mr = 817.27 and μ(MoKα) = 0.764 mm^(-1). The final R indices(I 〉 2σ(I)): R = 0.0505,wR = 0.1417; R indices(all data): R = 0.0591,wR = 0.1525. Crystal 2 is of triclinic system,space group P1 with a = 11.487(3),b = 13.396(4),c = 17.977(5) ?,α = 73.899(5),β = 86.629(5),γ = 65.018(4)°,V = 2403.8(12) ?3,Z = 2,F(000) = 1072,D3c = 1.417 g/cm,Mr = 1025.54,μ(MoKα) = 0.528 mm^(-1). The final R indices(I 〉 2σ(I)): R = 0.0769,w R = 0.163 2; R indices(all data): R = 0.0769,wR = 0.1632. The two compounds exhibit mononuclear structures. The copper(Ⅱ) atom of crystal 1 is six-coordinated by four nitrogen atoms of benzimidazole groups and two amine nitrogen atoms from the ligand IDB to adopt a distorted octahedral coordination geometry. The copper(Ⅱ) atom of crystal 2 is six-coordinated by four nitrogen atoms of benzimidazole groups and two amine nitrogen atoms from the ligand EDTB to show a distorted octahedral coordination geometry. Particularly,the two compounds exhibit fluorescent properties at room temperature in ethanol.展开更多
A new supramolecular compound, { [2-(2-pyridyl)benzimidazoleH2]2+.[SBC15]2-}2, was synthesized by the hydrothermal reaction of o-diaminobenzene, 2-pyridinecarboxylie acid and SbCl3 in 1:1 HC1 solution, and charact...A new supramolecular compound, { [2-(2-pyridyl)benzimidazoleH2]2+.[SBC15]2-}2, was synthesized by the hydrothermal reaction of o-diaminobenzene, 2-pyridinecarboxylie acid and SbCl3 in 1:1 HC1 solution, and characterized by chemical analysis, elemental analysis, IR spectra, thermogravimetfic analysis and fluorescence spectra. The crystal structure was deter- mined by X-ray single-crystal diffraction. The crystal belongs to the monoclinic system, space group P211c, with a = 16.0397(13), b = 14.3189(12), c = 15.6370(13) A, β = 105.8980(10)°, V = 3454.0(5) A3, Z = 4, C24H22Cl10N6Sb2, Mr = 992.48, Dc = 1.909 g/cm3,/z = 2.366 mm-1, S = 1.010, F(000) = 1920, R = 0.0254 and wR = 0.0555. The coordination anion, [SbCl5]2- which is a distorted tetragonal pyramid, is composed by coordinating action with Sb3+ ion and five adjacent chloride ions. Every four coordination anions of [SbCl5]2- form a biquaternion ring structure through the secondary bonding of Sb...Cl. Moreover, the compound adopts a three-dimensional network supramolecular structure because of the hydrogen bonds and π-π stacking between the rings and the 2-(2-pyridyl)benzimidazole divalent cations. The title compound also shows good fluorescent behaviors.展开更多
A metal-organic coordination compound formulated as [Cd(MDPPz)(BDC)(H2O)], 1 (MDPPz = 11-methyldipyrido[3,2-a:2′,3′-c]phenazine, BDC = 1,4-benzenedicarboxylate)has been hydrothermally synthesized and struct...A metal-organic coordination compound formulated as [Cd(MDPPz)(BDC)(H2O)], 1 (MDPPz = 11-methyldipyrido[3,2-a:2′,3′-c]phenazine, BDC = 1,4-benzenedicarboxylate)has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectrum, fluorescence spectrum and single-crystal X-ray diffraction. The title compound crystallizes in the monoclinic system, space group C2/c, with a = 30.673(8), b = 9.623(3), c = 20.784(6) A, β = 98.646(3)°, V = 6065(3) A3, C27H17CdN4O5, Mr= 589.85, Dc = 1.292 g/cm^3, μ(MoKα) = 0.757 mm-1, F(000) = 2360, Z = 8, the fmal R = 0.0381 and wR = 0.0855 for 4191 observed reflections (I〉 2σ(Ⅰ)). 1 exhibits blue fluorescence property at room temperature.展开更多
A new cadmium(Ⅱ) polymer [Cd(tdc)(Phen)]n 1 (H2tdc = thiophene-3,4-dicar-boxylic acid, Phen = 1,10-phenanthroline) was synthesized under hydrothermal conditions. The compound crystallizes in the triclinic sys...A new cadmium(Ⅱ) polymer [Cd(tdc)(Phen)]n 1 (H2tdc = thiophene-3,4-dicar-boxylic acid, Phen = 1,10-phenanthroline) was synthesized under hydrothermal conditions. The compound crystallizes in the triclinic system, space group P , with a = 7.3150(10), b = 10.3598(14), c = 10.8784(15) , α = 82.2740(10), β = 72.9730(10), γ = 80.236(2)°, V = 773.68(18) 3, Z = 2, Mr = 462.74, Dc = 1.986 Mg/m3, μ = 1.58 mm-1, F(000) = 456, the final R = 0.0218 and wR = 0.0465 for 3361 observed reflections with Ⅰ 〉 2σ(Ⅰ). The compound presents a one-dimensional (1-D) double-stranded structure and exhibits fluorescent emission at room temperature. Furthermore, infrared spectroscopy, elemental analyses, thermogravimetric analysis and powder X-ray diffraction properties of the compound are also investigated.展开更多
The title compound, {CdI2(2,2'-bipy)}n, was prepared by the hydrothermal reaction of CdI2 and 2,2'-bipy in an aqueous solution, and its crystal structure was determined by X-ray single-crystal analysis. Crystallog...The title compound, {CdI2(2,2'-bipy)}n, was prepared by the hydrothermal reaction of CdI2 and 2,2'-bipy in an aqueous solution, and its crystal structure was determined by X-ray single-crystal analysis. Crystallographic data for 1: C10H8N2CdI2, monoclinic system, space group C2/c, a = 16.927(1), b = 10.0925(7), c = 7.7422(3) A, β = 106.0629(4)°, V = 1271.00(14) A^3, Z = 4, F(000) = 944,/a = 6.546 mm^-1, Dc= 2.730 g/cm^3, Mr = 522.38, the final R = 0.0309 and wR = 0.0805 for 1310 observed reflections (I 〉 20(I)). X-ray crystal structure analysis shows that the Cd atom is coordinated by four iodines and two N atoms from one 2,2'-bipy to form an 1-D chain-like structure through bridging iodines. The fluorescene of the title compound was also discussed.展开更多
A three-dimensional complex [Cd(μ1,3-SCN)2(dmpo)]n has been synthesized with μ1,3-SCN^- and dmpo as mixed bridge ligands. The crystal belongs to monoclinic, space group C2/c with a = 15.648(2), b = 15.126(2)...A three-dimensional complex [Cd(μ1,3-SCN)2(dmpo)]n has been synthesized with μ1,3-SCN^- and dmpo as mixed bridge ligands. The crystal belongs to monoclinic, space group C2/c with a = 15.648(2), b = 15.126(2), c = 11.9773(15) A, β= 112.416(2)°, V= 2620.7(6) ,A, Z= 8, C9H9CdN3OS2, Mr = 351.71, Dc = 1.783 g/cm^3, F(000) = 1376 and μ = 1.967 mm^-1. The structure was refined to R = 0.0260 and wR = 0.0647 for 2186 observed reflections (I 〉 2σ(I)). In the crystal the Cd(Ⅱ) ions are coordinated by ,μ1,3-SCN^- bridge ligands to form the crossing chains on the adjacent planes, and these chains are further joined by μ-dmpo mono-dentate bridge ligands leading to a three-dimensional structure. The complex exhibits strong fluorescent emission property.展开更多
A novel one-dimensional chain-like coordination polymer constructed from 3-nitrobenzene- 1,2-dicarboxylic acid, [Cd2(C8H3NO6)2(H2O)4]n·2nH2O, has been synthesized and its structure was determined by X-ray cry...A novel one-dimensional chain-like coordination polymer constructed from 3-nitrobenzene- 1,2-dicarboxylic acid, [Cd2(C8H3NO6)2(H2O)4]n·2nH2O, has been synthesized and its structure was determined by X-ray crystallography method. The crystal belongs to monoclinic, space group P21/c with a = 6.1252(8), b = 20.706(3), c = 8.8067(11)A, β = 95.608(2)^o, V = 1111.6(2)A^3, Mr = 751.12, De= 2.244 g/cm^3, F(000) = 736,μ = 2.011 mm^-1, Z= 2, the final R = 0.0262 and wR = 0.0692 for 2338 observed reflections with I 〉 2a(I). The structure of the title compound presents a 1-D chain-like structure constructed by dimer units, [Cd2(C8H3NO6)2(H2O)4]n, through two carboxylate oxygen atoms. The fluorescence of the title compound has been also discussed in this paper.展开更多
The reaction of L-histidine, CdCl22.5H2O and 4,4-bipyridine in methane/water gave rise to a two-dimensional coordination polymer [CdCl2(4,4-bipyridine)] which has been characterized by single-crystal X-ray diffraction...The reaction of L-histidine, CdCl22.5H2O and 4,4-bipyridine in methane/water gave rise to a two-dimensional coordination polymer [CdCl2(4,4-bipyridine)] which has been characterized by single-crystal X-ray diffraction. The polymer crystallizes in the orthorhombic sys- tem, space group Cmmm with a = 12.083(7), b = 11.771(7), c = 3.781(2) ? V = 537.8(6) ?, Z = 2, C10H8N2CdCl2, Mr = 339.48, Dc = 2.097 g/cm3, F(000) = 328 and (MoK? = 2.490 mm-1. The final R = 0.0658 and wR = 0.1398 for 257 observed reflections with I≥2(I).展开更多
A new complex [Cd(H2biim)2(H2O)2]·(ino)2·4H2O (H2biim = 2,2'-biimidazole, ino = isonicotinate-N-oxide) has been prepared and characterized by single-crystal X-ray diffraction analysis, IR and fluore...A new complex [Cd(H2biim)2(H2O)2]·(ino)2·4H2O (H2biim = 2,2'-biimidazole, ino = isonicotinate-N-oxide) has been prepared and characterized by single-crystal X-ray diffraction analysis, IR and fluorescence spectra analysis. The crystal is of triclinic system, space group P1 with a = 7.5380(6), b = 8.0402(7), c = 13.5094(11) , α = 104.269(1), β = 93.604(1), γ = 98.349(1)°, V = 780.93(11) 3, Mr = 765.00, Dc = 1.627 g/cm3, F(000) = 390, μ = 0.776 mm-1 and Z = 1. The final R = 0.0322 and wR = 0.0825 for 7038 observed reflections with I 2σ(I) and R = 0.0341 and wR = 0.0832 for all data. The title complex exhibits an infinite chain-like structure through bridging isonicotinate-N-oxide. Strong interchain hydrogen bonds between isonicotinate-N-oxide and H2biim result in the robust 3-D supramolecular architecture. Moreover, the complex shows strong photoluminescence with emission maximum at λ = 401 nm upon λex = 330 nm.展开更多
A new cadmium(N) compound, {[ CdLu-(4,4'-dps) ]2(H2O)2]'(4'abs )2(H2O)2n 1 (4,4'-dps = 4,4'-dipyridylsulfide, 4-abs = deprotonated 4-amino benzenesulfonic acid), has been synthesized and structurally ...A new cadmium(N) compound, {[ CdLu-(4,4'-dps) ]2(H2O)2]'(4'abs )2(H2O)2n 1 (4,4'-dps = 4,4'-dipyridylsulfide, 4-abs = deprotonated 4-amino benzenesulfonic acid), has been synthesized and structurally characterized. It belongs to the orthorhombic system, space group Pbcn with a = 19.950(3), b = 10.6381(13), c = 18.055(2)A, V= 3831.8(8) A3, Z = 4, C32H36CdN6010S4, Mr = 905.31, F(000) = 1848, μ= 0.850 mm^-1, Dc = 1.569 Mg/m^3, the final R = 0.0238 and wR = 0.0589 for 3080 observed reflections with I 〉 2σ(I). Complex I is a one-dimensional linear chain coordination polymer and the repeat unit is comprised of doubly charged cadmium complex cation, uncoordinated 4-aminobenzene sulfonate anions and water molecules. The cadmium(H) ion adopts a six-coordinate distorted octahedral geometry. Complex 1 is stabilized and linked into a three-dimensional layered structure through intermolecular O-H…O and N-H…O hydrogen bonds together with electrostatic force. The cyclic voltammograms and fluorescence spectrum of 1 were also measured. It shows one irreversible redox process and emits a very strong and sharp fluorescent band at about 341 nm.展开更多
Two compounds C_8H_(18)N_2Br_3Mn_(0.5)(1) and C_(12)H_(26)N_2Cl_4Mn(2) based on triethylenediamine derivatives were synthesized by solution method and were characterized by elemental analysis, infrared spectroscopy, s...Two compounds C_8H_(18)N_2Br_3Mn_(0.5)(1) and C_(12)H_(26)N_2Cl_4Mn(2) based on triethylenediamine derivatives were synthesized by solution method and were characterized by elemental analysis, infrared spectroscopy, single-crystal X-ray structure analysis, fluorescence test, circular dichroism(CD) analysis and dielectric measurement, respectively. According to single-crystal X-ray determination, compound 1 crystallizes in the cubic system, space group Pa3 with a = b = c = 13.7246(5) ?, Z = 24, V = 2585.2(3) ?~3; and compound 2 crystallizes in the orthorhombic system, space group P212121 with a = 7.9716(13), b = 15.309(3), c = 15.804(3) ?, Z = 4 and V = 1928.7(6) ?3. Fluorescent analysis of compound 1 showed an intense emission band at 670 nm when the exciting radiation was set at 378 nm and fluorescent analysis of compound 2 showed an intense emission band at 515 nm when the exciting radiation was set at 363 nm. Dielectric constants of compounds 1 and 2 were measured at different frequencies with temperature variation.展开更多
The two title complexes, [Cd{3,5-(NO2)2sal}(2,2′-bipy)]n 1 and [Mn{3,5- (NO2)2sal}(2,2′-bipy)]n 2 (3,5-(NO2)2sal = 3,5-dinitrosalicylate, 2,2'-bipy = 2,2′-bipyridine), were synthesized by the hydrother...The two title complexes, [Cd{3,5-(NO2)2sal}(2,2′-bipy)]n 1 and [Mn{3,5- (NO2)2sal}(2,2′-bipy)]n 2 (3,5-(NO2)2sal = 3,5-dinitrosalicylate, 2,2'-bipy = 2,2′-bipyridine), were synthesized by the hydrothermal reaction and structurally characterized. Complex 1 crystallizes in triclinic, space group P1, a = 5.581(4), b = 12.071(8), c = 12.88(1)A, α= 92.10(3),β= 96.73(3), γ = 102.02(2)°, C17H10N407Cd, Mr = 494.69, V= 841(1)A3, Z = 2, Dc = 1.954 g/cm3, F(000) = 488, μ= 1.353 mm^-1, R = 0.0248 and wR = 0.0761. Complex 2 crystallizes in monoclinic with space group P21/c, a = 8.604(3), b = 23.88(1), c = 8.894(3) A, β = 102.45(1)°, C17H10N407Mn, Mr = 437.23, V= 1785(1) A3, Z=.4, Dc = 1.627 g/cm3, F(000) = 884, μ = 0.791 mm^-1, R = 0.0471 and wR = 0.1250. Complex 1 possesses an infinite 1D polymeric chain structure consisting of the repeated basic four-membered ring units (Cd2O2) and eight-membered ring units (CdOCO)2. Compound 2displays a linear 1D chain through Mn(Ⅱ) atoms and bridging carboxylate groups of 3,5-dinitrosalicylic acid ligands with the Mn…Mn separation of 4.472(2)A. The fluorescence properties and cyclic voltammetric behaviors of the complexes are also reported.展开更多
A new Cd(II) complex [Cd(C12H6OaN2)(Phen)ffH2O)]'3H2O with 2,2"-bipyridine- 3,3"-dicarboxylic acid as a ligand has been synthesized. Crystal data for the title complex are as follows: monoclinic, space grou...A new Cd(II) complex [Cd(C12H6OaN2)(Phen)ffH2O)]'3H2O with 2,2"-bipyridine- 3,3"-dicarboxylic acid as a ligand has been synthesized. Crystal data for the title complex are as follows: monoclinic, space group P2dn, a = 12.8458(5), b = 17.9131(7), c = 15.2960(6) A, β = 111.7430(10)°, V = 3269.3(2) A3, Dc = 1.581 g/cm3, Z = 4,/a(MoKa) = 0.731 mm-1, F(000) = 1580, the R = 0.0244 and wR = 0.0605. In the title complex, the central Cd(ll) ion is located in a distorted octahedral coordination environment. The electrochemical and fluorescent properties of the title complex were studied. The results show that the electron transfer of the title complex is irreversible in the electrode reaction and it has a broad emission peak in the range of 470-508 nm with the excitation wavelength of 488 nm.展开更多
A new inorganic-organic hybrid cadmium(Ⅱ) complex [Cd2(H1/2C4BIm)2(CH3COO)]nhas been prepared by a hydrothermal reaction,and characterized by fluorescence,IR,TGA,and single-crystal X-ray diffraction analysis.In...A new inorganic-organic hybrid cadmium(Ⅱ) complex [Cd2(H1/2C4BIm)2(CH3COO)]nhas been prepared by a hydrothermal reaction,and characterized by fluorescence,IR,TGA,and single-crystal X-ray diffraction analysis.In its crystal structure,there are two kinds of coordinating forms for those Cd(Ⅱ) ions.One is that the Cd(Ⅱ) ion is coordinated by one carboxylate oxygen atom from one acetate oxygen ligand and three benzimidazole nitrogen atoms from three 2,2’-(1,4-butanediyl)bis(1H-benzimidazole)(H2C4BIm) ligands,and the other is that the Cd(Ⅱ) ion is coordinated by four benzimidazole nitrogen atoms from four H2C4 BIm ligands to furnish two distorted tetrahedral coordination geometries.It exhibits a beautiful structure for a 2D layer and a 3D network,with its four-connecting nodes provided by the H2C4 BIm ligands.Furthermore,this complex shows intense luminescent property at room temperature.In [Cd2(H2C2BIm)2(C9H6O4)2]n,the H2C2 BIm ligand lost the role as a bridging ligand because of the shorter alkyl chain compared with that of H2C4 BIm ligand.展开更多
Two new bearing Bi(Ⅲ) supramolecular compounds [Bi(pydcH)_(3)(Bi(pydcH)(pydcH_(2))(pydc)(Bi(pydcH)(pydcH_(2))(pydc)](1) and {[Bi(pydcH)_(3)]·(H_(2)O)_(5)(Dmap)}_(2)(2) have been successfully synthesized via hydr...Two new bearing Bi(Ⅲ) supramolecular compounds [Bi(pydcH)_(3)(Bi(pydcH)(pydcH_(2))(pydc)(Bi(pydcH)(pydcH_(2))(pydc)](1) and {[Bi(pydcH)_(3)]·(H_(2)O)_(5)(Dmap)}_(2)(2) have been successfully synthesized via hydrothermal reaction(pydcH_(2) = 2,6-pyridine dicarboxylate, Dmap = 4-dimethylamiopyridine). They have been structurally determined by single-crystal X-ray analysis, and characterized by fluorescence analysis and thermogravimetric analysis(TG). Both compounds 1 and 2 are of the same triclinic system with different structures. The decomposition mechanisms of compounds 1 and 2 are discussed. Compared to 1, lots of small molecules were possibly removed from compound 2 below 250 ℃. In addition, the photoluminescence properties were also investigated.展开更多
The coordination polymer [Mn2(cipt)2(aic)2]n (cipt = 2-(3-chlorophenyl)-1H- imidazo[4,5-f][1,10]phenanthroline, aic = 5-amino-isophthalic acid) has been obtained from hydrothermal reaction and characterized by...The coordination polymer [Mn2(cipt)2(aic)2]n (cipt = 2-(3-chlorophenyl)-1H- imidazo[4,5-f][1,10]phenanthroline, aic = 5-amino-isophthalic acid) has been obtained from hydrothermal reaction and characterized by elemental analysis, IR, TG and single-crystal X-ray diffraction. The title compound crystallizes in the triclinic system, space group P , with a = 11.523(3), b = 12.162(3), c = 18.706(5) A^°, β = 81.789(5)°, V = 2455.2(1) A^°3, C54H32Cl2Mn2N10O8, Mr = 1129.68, Z = 2, Dc = 1.528 g/cm3, μ = 0.692 mm^-1, F(000) = 1148, R = 0.064 and wR = 0.145 for 9571 observed reflections (I 〉 2σ(I)). In this polymer, the Mn(II) atoms adopt different coordination modes. The Mn(1) atom is five-coordinated, forming a distorted tetragonal pyramidal geometry. Mn(2) atom is six-coordinated to get a distorted octahedral geometry, which is different from the Mn(1) atom. Each Mn(II) atom is linked by aic ligands with neighboring Mn(II) atoms, forming an infinite one-dimensional (1D) double-chain structure. The existence of N–H…O hydrogen bonding interactions leads the 1D chains to generate a 2D structure. Luminescent properties for the ligand cipt and compound 1 have also been discussed in detail.展开更多
Two phase transition materials[iPrQ]2MnBr4(1,iPrQ=N-isopropyl-quinuclidinium)and[iPrQ]_(2)MnCl_(4)(2)were synthesized and characterized.Dielectric measurements and differential scanning calorimetry showed that the two...Two phase transition materials[iPrQ]2MnBr4(1,iPrQ=N-isopropyl-quinuclidinium)and[iPrQ]_(2)MnCl_(4)(2)were synthesized and characterized.Dielectric measurements and differential scanning calorimetry showed that the two compounds underwent reversible phase transitions at ca.–47 and–37℃,respectively.Variable-temperature single-crystal X-ray diffraction suggested that the two compounds underwent the same phase transitions from space group C2/c to Cc but at different temperature.The variable crystal structures indicated that the structural phase transitions of the compound were ascribed to the torsional movement of quinuclidine ring and the disappearance of the c-slide plane.The second harmonic generation(SHG)response further proved this structural phase transition.Fluorescence tests showed that the two compounds have strong fluorescence.The strong variations in dielectric anomalies make compounds 1 and 2 suitable for promising switchable dielectric materials.展开更多
A dimeric coordination complex Cd2(ncpo)2(phen)2(H2O)2 was constructed by a flexible dicarboxylic acid, 2-nitro-4-carboxylphenoxyacetic acid. Its crystal structure was determined by X-ray single-crystal diffract...A dimeric coordination complex Cd2(ncpo)2(phen)2(H2O)2 was constructed by a flexible dicarboxylic acid, 2-nitro-4-carboxylphenoxyacetic acid. Its crystal structure was determined by X-ray single-crystal diffraction analysis. The crystal is of monoclinic system, space group P21/n with a = 17.2616(3), b = 12.7460(2), c = 18.4041(3) A^°, β= 94.432(1)°, C42H30Cd2N6O16, Mr = 1099.52, V = 4037.09(12)A^°^3 Dc = 1.809 g/cm^3, F(000) = 2192, μ = 1.139 cm^-1 and Z = 4. The final R = 0.0218 and wR = 0.0703 for 8288 observed reflections with I 〉 2σ(I). There are two crystallographically independent but structurally very similar molecules in the unit cell of the title complex. It is noticeable that the ligand ncpo^2- displays a good flexibility, demonstrating different modes from the rigid ligands. The luminescence property has been investigated, which shows photoluminescence at 465, 490 and 574 nm upon excitation at 320 nm in the solid state at room temperature.展开更多
One new coordination polymer(CP) [Cd(bct)(bib)]·2(H2O)(1), based on 3,5-bis(4'-carboxy-phenyl)-1,2,4-triazole(H2 bct) and 1,4-bis(imidazol-1-ylmethyl)benzene(bib), has been synthesized by hydro...One new coordination polymer(CP) [Cd(bct)(bib)]·2(H2O)(1), based on 3,5-bis(4'-carboxy-phenyl)-1,2,4-triazole(H2 bct) and 1,4-bis(imidazol-1-ylmethyl)benzene(bib), has been synthesized by hydrothermal method, and its structure was determined and characterized by single-crystal X-ray diffraction analysis, elemental analysis, IR spectroscopy, and thermogravimetric analysis. The crystal structure of CP 1 is a three-dimensional framework with(3,5)-connected topology, where the bct ligands adopt a μ3-kO,kO,kO coordination mode connecting with three Cd centers and the bib ligands adopt a μ2-k N,k N coordination mode bridging two Cd ions. It crystallizes in monoclinic system, space group C2/c, with a = 2.6838(4), b = 1.24221(17), c = 1.8011(2) nm, β = 102.939(2)o, V = 5.8522(13) nm^3, Z = 8, C30 H27 CdN7O6, Mr = 694.00, Dc = 1.566 g/cm^3, F(000) = 2784, S = 1.055, R = 0.0294 and wR = 0.0731. Furthermore, solid-state photoluminescence measurements show that CP 1 produces strong emissions at room temperature.展开更多
Two mixed-ligand polymeric complexes formulated as {[Zn(pda)(bpy)]·0.5H2O}n (pda = 1,4-phenylenediacetate, bpy = 2,2'-bipyridine) 1 and {[Cd(pda)(bpy)]·1.5H2O}n 2 have been hydrothermally synthesi...Two mixed-ligand polymeric complexes formulated as {[Zn(pda)(bpy)]·0.5H2O}n (pda = 1,4-phenylenediacetate, bpy = 2,2'-bipyridine) 1 and {[Cd(pda)(bpy)]·1.5H2O}n 2 have been hydrothermally synthesized. Single-crystal X-ray diffraction analyses reveal that the structures of complexes 1 and 2 possess similar one-dimensional zigzag chains. Crystal data for compound 1: monoclinic, space group P21/c, a = 15.965(2), b = 8.305(1), c= 14.856(2) °A, β= 111.048(2)°, Mr = 422.73, V = 1838.2(4)°A^3, Z = 4, Dc = 1.528 g/cm^3, μ= 1.368 mm^-1, F(000) = 868, the final R = 0.0783 and wR = 0.1469 (w =1/[σ^2(Fo^2) + (0.0351P)^2+ 8.0014P], where P = (Fo^2 + 2Fc^2)/3) based on 2025 observed reflections with I〉 2σ(I); and those for compound 2: monoclinic, space group C2/c, a = 29.921 (7), b = 8.5400(17), c = 15.320(3) °A,β= 99.59(3)°, Mr = 487.75, V = 3859.9(14) °A^3, Z = 8, Dc = 1.668 g/cm^3, μ= 1.169 mm^-1, F(000) = 1936, the final R = 0.0723 and wR = 0.1612 (w = 1/[σ^2(Fo^2) + (0.0681P)^2 + 55.9577P], where P = (Fo^2 + 2Fc^2)/3) based on 2130 observed reflections with I〉 2σ(I). Fluorescent analyses show that both complexes exhibit intense blue luminescence (λmax = 485 nm for 1 and 475 nm for 2) upon excitation at 330 nm.展开更多
基金supported by Research Fund for the Doctor Program of Hubei University of Technology(No.BSQD12139)Ministry of Science and Technology Small and Medium-sized Enterprise Venture Funds(No.12C26214204453)+1 种基金Natural Foundation of Hubei Province(No.2010CDA020)the Key Foundation of Industry-University-Research Cooperation of Education Department,Hubei Province(No.CXY2009A010)
文摘Two new compounds,1([Cu(IDB_)2]Cl_2·2CH_3CH_2OH·2H_2O(IDB = N,N-di(2-benzimidazolylmethyl)imine]) and 2([Cu(EDTB)]·2[C_6H_4(OH)COO]·6H_2O(EDTB = N,N,N',N'-tetrakis-[(2-benzimidazolyl)methyl]-1,2-ethanediamine]),have been synthesized and their crystal structures were determined by single-crystal X-ray diffraction. Crystal 1 belongs to the triclinic system,space group P1 with a = 9.565(2),b = 9.863(2),c = 10.252(3) ?,α = 81.915,β = 88.330,γ = 87.347°,V = 956.28(40) ?3,Z = 1,F(000) = 427,D_c = 1.419 g/cm3,Mr = 817.27 and μ(MoKα) = 0.764 mm^(-1). The final R indices(I 〉 2σ(I)): R = 0.0505,wR = 0.1417; R indices(all data): R = 0.0591,wR = 0.1525. Crystal 2 is of triclinic system,space group P1 with a = 11.487(3),b = 13.396(4),c = 17.977(5) ?,α = 73.899(5),β = 86.629(5),γ = 65.018(4)°,V = 2403.8(12) ?3,Z = 2,F(000) = 1072,D3c = 1.417 g/cm,Mr = 1025.54,μ(MoKα) = 0.528 mm^(-1). The final R indices(I 〉 2σ(I)): R = 0.0769,w R = 0.163 2; R indices(all data): R = 0.0769,wR = 0.1632. The two compounds exhibit mononuclear structures. The copper(Ⅱ) atom of crystal 1 is six-coordinated by four nitrogen atoms of benzimidazole groups and two amine nitrogen atoms from the ligand IDB to adopt a distorted octahedral coordination geometry. The copper(Ⅱ) atom of crystal 2 is six-coordinated by four nitrogen atoms of benzimidazole groups and two amine nitrogen atoms from the ligand EDTB to show a distorted octahedral coordination geometry. Particularly,the two compounds exhibit fluorescent properties at room temperature in ethanol.
基金Supported by the Natural Science Foundation of Henan Province (No. 0611023700)Natural Science Foundation of Education Department of Henan Province (No. 2006150019)
文摘A new supramolecular compound, { [2-(2-pyridyl)benzimidazoleH2]2+.[SBC15]2-}2, was synthesized by the hydrothermal reaction of o-diaminobenzene, 2-pyridinecarboxylie acid and SbCl3 in 1:1 HC1 solution, and characterized by chemical analysis, elemental analysis, IR spectra, thermogravimetfic analysis and fluorescence spectra. The crystal structure was deter- mined by X-ray single-crystal diffraction. The crystal belongs to the monoclinic system, space group P211c, with a = 16.0397(13), b = 14.3189(12), c = 15.6370(13) A, β = 105.8980(10)°, V = 3454.0(5) A3, Z = 4, C24H22Cl10N6Sb2, Mr = 992.48, Dc = 1.909 g/cm3,/z = 2.366 mm-1, S = 1.010, F(000) = 1920, R = 0.0254 and wR = 0.0555. The coordination anion, [SbCl5]2- which is a distorted tetragonal pyramid, is composed by coordinating action with Sb3+ ion and five adjacent chloride ions. Every four coordination anions of [SbCl5]2- form a biquaternion ring structure through the secondary bonding of Sb...Cl. Moreover, the compound adopts a three-dimensional network supramolecular structure because of the hydrogen bonds and π-π stacking between the rings and the 2-(2-pyridyl)benzimidazole divalent cations. The title compound also shows good fluorescent behaviors.
基金the Natural Science Foundation of Jilin Province (No. 2005103)
文摘A metal-organic coordination compound formulated as [Cd(MDPPz)(BDC)(H2O)], 1 (MDPPz = 11-methyldipyrido[3,2-a:2′,3′-c]phenazine, BDC = 1,4-benzenedicarboxylate)has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectrum, fluorescence spectrum and single-crystal X-ray diffraction. The title compound crystallizes in the monoclinic system, space group C2/c, with a = 30.673(8), b = 9.623(3), c = 20.784(6) A, β = 98.646(3)°, V = 6065(3) A3, C27H17CdN4O5, Mr= 589.85, Dc = 1.292 g/cm^3, μ(MoKα) = 0.757 mm-1, F(000) = 2360, Z = 8, the fmal R = 0.0381 and wR = 0.0855 for 4191 observed reflections (I〉 2σ(Ⅰ)). 1 exhibits blue fluorescence property at room temperature.
基金supported by the National Natural Science Foundation of China (No. 21172105)the Foundation of the Education Department of Henan Province (No. 2011A150021)
文摘A new cadmium(Ⅱ) polymer [Cd(tdc)(Phen)]n 1 (H2tdc = thiophene-3,4-dicar-boxylic acid, Phen = 1,10-phenanthroline) was synthesized under hydrothermal conditions. The compound crystallizes in the triclinic system, space group P , with a = 7.3150(10), b = 10.3598(14), c = 10.8784(15) , α = 82.2740(10), β = 72.9730(10), γ = 80.236(2)°, V = 773.68(18) 3, Z = 2, Mr = 462.74, Dc = 1.986 Mg/m3, μ = 1.58 mm-1, F(000) = 456, the final R = 0.0218 and wR = 0.0465 for 3361 observed reflections with Ⅰ 〉 2σ(Ⅰ). The compound presents a one-dimensional (1-D) double-stranded structure and exhibits fluorescent emission at room temperature. Furthermore, infrared spectroscopy, elemental analyses, thermogravimetric analysis and powder X-ray diffraction properties of the compound are also investigated.
基金Supported by the Education Foundation of Fujian (JA 05304)the Project of Fujian Science & Technology Committee (2006F5067)
文摘The title compound, {CdI2(2,2'-bipy)}n, was prepared by the hydrothermal reaction of CdI2 and 2,2'-bipy in an aqueous solution, and its crystal structure was determined by X-ray single-crystal analysis. Crystallographic data for 1: C10H8N2CdI2, monoclinic system, space group C2/c, a = 16.927(1), b = 10.0925(7), c = 7.7422(3) A, β = 106.0629(4)°, V = 1271.00(14) A^3, Z = 4, F(000) = 944,/a = 6.546 mm^-1, Dc= 2.730 g/cm^3, Mr = 522.38, the final R = 0.0309 and wR = 0.0805 for 1310 observed reflections (I 〉 20(I)). X-ray crystal structure analysis shows that the Cd atom is coordinated by four iodines and two N atoms from one 2,2'-bipy to form an 1-D chain-like structure through bridging iodines. The fluorescene of the title compound was also discussed.
基金This work was supported by the National Natural Science Foundation of China (No. 20271043) and Natural Science Foundation of Shandong Province (Y2005B25)
文摘A three-dimensional complex [Cd(μ1,3-SCN)2(dmpo)]n has been synthesized with μ1,3-SCN^- and dmpo as mixed bridge ligands. The crystal belongs to monoclinic, space group C2/c with a = 15.648(2), b = 15.126(2), c = 11.9773(15) A, β= 112.416(2)°, V= 2620.7(6) ,A, Z= 8, C9H9CdN3OS2, Mr = 351.71, Dc = 1.783 g/cm^3, F(000) = 1376 and μ = 1.967 mm^-1. The structure was refined to R = 0.0260 and wR = 0.0647 for 2186 observed reflections (I 〉 2σ(I)). In the crystal the Cd(Ⅱ) ions are coordinated by ,μ1,3-SCN^- bridge ligands to form the crossing chains on the adjacent planes, and these chains are further joined by μ-dmpo mono-dentate bridge ligands leading to a three-dimensional structure. The complex exhibits strong fluorescent emission property.
基金Supported by the Project of Fujian Science & Technology Committee (2006F5067)National Natural Science Foundations of China(20705031)
文摘A novel one-dimensional chain-like coordination polymer constructed from 3-nitrobenzene- 1,2-dicarboxylic acid, [Cd2(C8H3NO6)2(H2O)4]n·2nH2O, has been synthesized and its structure was determined by X-ray crystallography method. The crystal belongs to monoclinic, space group P21/c with a = 6.1252(8), b = 20.706(3), c = 8.8067(11)A, β = 95.608(2)^o, V = 1111.6(2)A^3, Mr = 751.12, De= 2.244 g/cm^3, F(000) = 736,μ = 2.011 mm^-1, Z= 2, the final R = 0.0262 and wR = 0.0692 for 2338 observed reflections with I 〉 2a(I). The structure of the title compound presents a 1-D chain-like structure constructed by dimer units, [Cd2(C8H3NO6)2(H2O)4]n, through two carboxylate oxygen atoms. The fluorescence of the title compound has been also discussed in this paper.
基金This work was supported by the National Natural Science Foundation of China (No. 20231020)
文摘The reaction of L-histidine, CdCl22.5H2O and 4,4-bipyridine in methane/water gave rise to a two-dimensional coordination polymer [CdCl2(4,4-bipyridine)] which has been characterized by single-crystal X-ray diffraction. The polymer crystallizes in the orthorhombic sys- tem, space group Cmmm with a = 12.083(7), b = 11.771(7), c = 3.781(2) ? V = 537.8(6) ?, Z = 2, C10H8N2CdCl2, Mr = 339.48, Dc = 2.097 g/cm3, F(000) = 328 and (MoK? = 2.490 mm-1. The final R = 0.0658 and wR = 0.1398 for 257 observed reflections with I≥2(I).
基金supported by the National Natural Science Foundation of China (No. 20772042)
文摘A new complex [Cd(H2biim)2(H2O)2]·(ino)2·4H2O (H2biim = 2,2'-biimidazole, ino = isonicotinate-N-oxide) has been prepared and characterized by single-crystal X-ray diffraction analysis, IR and fluorescence spectra analysis. The crystal is of triclinic system, space group P1 with a = 7.5380(6), b = 8.0402(7), c = 13.5094(11) , α = 104.269(1), β = 93.604(1), γ = 98.349(1)°, V = 780.93(11) 3, Mr = 765.00, Dc = 1.627 g/cm3, F(000) = 390, μ = 0.776 mm-1 and Z = 1. The final R = 0.0322 and wR = 0.0825 for 7038 observed reflections with I 2σ(I) and R = 0.0341 and wR = 0.0832 for all data. The title complex exhibits an infinite chain-like structure through bridging isonicotinate-N-oxide. Strong interchain hydrogen bonds between isonicotinate-N-oxide and H2biim result in the robust 3-D supramolecular architecture. Moreover, the complex shows strong photoluminescence with emission maximum at λ = 401 nm upon λex = 330 nm.
基金supported by the National Natural Science Foundation of China (No. 20471026)the Natural Science Foundation of Henan Province (No. 0311021200)
文摘A new cadmium(N) compound, {[ CdLu-(4,4'-dps) ]2(H2O)2]'(4'abs )2(H2O)2n 1 (4,4'-dps = 4,4'-dipyridylsulfide, 4-abs = deprotonated 4-amino benzenesulfonic acid), has been synthesized and structurally characterized. It belongs to the orthorhombic system, space group Pbcn with a = 19.950(3), b = 10.6381(13), c = 18.055(2)A, V= 3831.8(8) A3, Z = 4, C32H36CdN6010S4, Mr = 905.31, F(000) = 1848, μ= 0.850 mm^-1, Dc = 1.569 Mg/m^3, the final R = 0.0238 and wR = 0.0589 for 3080 observed reflections with I 〉 2σ(I). Complex I is a one-dimensional linear chain coordination polymer and the repeat unit is comprised of doubly charged cadmium complex cation, uncoordinated 4-aminobenzene sulfonate anions and water molecules. The cadmium(H) ion adopts a six-coordinate distorted octahedral geometry. Complex 1 is stabilized and linked into a three-dimensional layered structure through intermolecular O-H…O and N-H…O hydrogen bonds together with electrostatic force. The cyclic voltammograms and fluorescence spectrum of 1 were also measured. It shows one irreversible redox process and emits a very strong and sharp fluorescent band at about 341 nm.
基金financially supported by the National Natural Science Foundation of China(21671084)Six Talent Peaks Project in Jiangsu Province(2014-XCL-008)the Qing Lan Project of Jiangsu Province and the Foundation of Jiangsu Educational Committee(16KJB430011)
文摘Two compounds C_8H_(18)N_2Br_3Mn_(0.5)(1) and C_(12)H_(26)N_2Cl_4Mn(2) based on triethylenediamine derivatives were synthesized by solution method and were characterized by elemental analysis, infrared spectroscopy, single-crystal X-ray structure analysis, fluorescence test, circular dichroism(CD) analysis and dielectric measurement, respectively. According to single-crystal X-ray determination, compound 1 crystallizes in the cubic system, space group Pa3 with a = b = c = 13.7246(5) ?, Z = 24, V = 2585.2(3) ?~3; and compound 2 crystallizes in the orthorhombic system, space group P212121 with a = 7.9716(13), b = 15.309(3), c = 15.804(3) ?, Z = 4 and V = 1928.7(6) ?3. Fluorescent analysis of compound 1 showed an intense emission band at 670 nm when the exciting radiation was set at 378 nm and fluorescent analysis of compound 2 showed an intense emission band at 515 nm when the exciting radiation was set at 363 nm. Dielectric constants of compounds 1 and 2 were measured at different frequencies with temperature variation.
基金the National Natural Science Foundation of China (No. 20431010)
文摘The two title complexes, [Cd{3,5-(NO2)2sal}(2,2′-bipy)]n 1 and [Mn{3,5- (NO2)2sal}(2,2′-bipy)]n 2 (3,5-(NO2)2sal = 3,5-dinitrosalicylate, 2,2'-bipy = 2,2′-bipyridine), were synthesized by the hydrothermal reaction and structurally characterized. Complex 1 crystallizes in triclinic, space group P1, a = 5.581(4), b = 12.071(8), c = 12.88(1)A, α= 92.10(3),β= 96.73(3), γ = 102.02(2)°, C17H10N407Cd, Mr = 494.69, V= 841(1)A3, Z = 2, Dc = 1.954 g/cm3, F(000) = 488, μ= 1.353 mm^-1, R = 0.0248 and wR = 0.0761. Complex 2 crystallizes in monoclinic with space group P21/c, a = 8.604(3), b = 23.88(1), c = 8.894(3) A, β = 102.45(1)°, C17H10N407Mn, Mr = 437.23, V= 1785(1) A3, Z=.4, Dc = 1.627 g/cm3, F(000) = 884, μ = 0.791 mm^-1, R = 0.0471 and wR = 0.1250. Complex 1 possesses an infinite 1D polymeric chain structure consisting of the repeated basic four-membered ring units (Cd2O2) and eight-membered ring units (CdOCO)2. Compound 2displays a linear 1D chain through Mn(Ⅱ) atoms and bridging carboxylate groups of 3,5-dinitrosalicylic acid ligands with the Mn…Mn separation of 4.472(2)A. The fluorescence properties and cyclic voltammetric behaviors of the complexes are also reported.
基金Fund of Science and Technology Committee of Hunan Province(No.2012GK3030)Scientific Research Fund of Hunan Provincial Education Department(No.11C0186)+1 种基金Hengyang Bureau of Science and Technology(No.2011kG28)the Key Discipline Project of Hunan Province
文摘A new Cd(II) complex [Cd(C12H6OaN2)(Phen)ffH2O)]'3H2O with 2,2"-bipyridine- 3,3"-dicarboxylic acid as a ligand has been synthesized. Crystal data for the title complex are as follows: monoclinic, space group P2dn, a = 12.8458(5), b = 17.9131(7), c = 15.2960(6) A, β = 111.7430(10)°, V = 3269.3(2) A3, Dc = 1.581 g/cm3, Z = 4,/a(MoKa) = 0.731 mm-1, F(000) = 1580, the R = 0.0244 and wR = 0.0605. In the title complex, the central Cd(ll) ion is located in a distorted octahedral coordination environment. The electrochemical and fluorescent properties of the title complex were studied. The results show that the electron transfer of the title complex is irreversible in the electrode reaction and it has a broad emission peak in the range of 470-508 nm with the excitation wavelength of 488 nm.
基金supported by the Natural Science Foundation of China(No.21173003)the Scientific Research Project(No.13JS007)from Shaanxi Key Laboratory of PhytochemistryKey Research Project(No.ZK12016)from Baoji University of Arts and Sciences
文摘A new inorganic-organic hybrid cadmium(Ⅱ) complex [Cd2(H1/2C4BIm)2(CH3COO)]nhas been prepared by a hydrothermal reaction,and characterized by fluorescence,IR,TGA,and single-crystal X-ray diffraction analysis.In its crystal structure,there are two kinds of coordinating forms for those Cd(Ⅱ) ions.One is that the Cd(Ⅱ) ion is coordinated by one carboxylate oxygen atom from one acetate oxygen ligand and three benzimidazole nitrogen atoms from three 2,2’-(1,4-butanediyl)bis(1H-benzimidazole)(H2C4BIm) ligands,and the other is that the Cd(Ⅱ) ion is coordinated by four benzimidazole nitrogen atoms from four H2C4 BIm ligands to furnish two distorted tetrahedral coordination geometries.It exhibits a beautiful structure for a 2D layer and a 3D network,with its four-connecting nodes provided by the H2C4 BIm ligands.Furthermore,this complex shows intense luminescent property at room temperature.In [Cd2(H2C2BIm)2(C9H6O4)2]n,the H2C2 BIm ligand lost the role as a bridging ligand because of the shorter alkyl chain compared with that of H2C4 BIm ligand.
基金supported by the Natural Science Foundation of Hunan Province(2020JJ6041)the Foundation of Key Laboratory of Functional Organometallic Compounds of Hunan Province(MO20K04)the Center for Functionalization of Metal-Organic Frameworks Materials Studies(KYJG1082)。
文摘Two new bearing Bi(Ⅲ) supramolecular compounds [Bi(pydcH)_(3)(Bi(pydcH)(pydcH_(2))(pydc)(Bi(pydcH)(pydcH_(2))(pydc)](1) and {[Bi(pydcH)_(3)]·(H_(2)O)_(5)(Dmap)}_(2)(2) have been successfully synthesized via hydrothermal reaction(pydcH_(2) = 2,6-pyridine dicarboxylate, Dmap = 4-dimethylamiopyridine). They have been structurally determined by single-crystal X-ray analysis, and characterized by fluorescence analysis and thermogravimetric analysis(TG). Both compounds 1 and 2 are of the same triclinic system with different structures. The decomposition mechanisms of compounds 1 and 2 are discussed. Compared to 1, lots of small molecules were possibly removed from compound 2 below 250 ℃. In addition, the photoluminescence properties were also investigated.
基金supported by the National Natural Science Foundation of China(No.21406085)
文摘The coordination polymer [Mn2(cipt)2(aic)2]n (cipt = 2-(3-chlorophenyl)-1H- imidazo[4,5-f][1,10]phenanthroline, aic = 5-amino-isophthalic acid) has been obtained from hydrothermal reaction and characterized by elemental analysis, IR, TG and single-crystal X-ray diffraction. The title compound crystallizes in the triclinic system, space group P , with a = 11.523(3), b = 12.162(3), c = 18.706(5) A^°, β = 81.789(5)°, V = 2455.2(1) A^°3, C54H32Cl2Mn2N10O8, Mr = 1129.68, Z = 2, Dc = 1.528 g/cm3, μ = 0.692 mm^-1, F(000) = 1148, R = 0.064 and wR = 0.145 for 9571 observed reflections (I 〉 2σ(I)). In this polymer, the Mn(II) atoms adopt different coordination modes. The Mn(1) atom is five-coordinated, forming a distorted tetragonal pyramidal geometry. Mn(2) atom is six-coordinated to get a distorted octahedral geometry, which is different from the Mn(1) atom. Each Mn(II) atom is linked by aic ligands with neighboring Mn(II) atoms, forming an infinite one-dimensional (1D) double-chain structure. The existence of N–H…O hydrogen bonding interactions leads the 1D chains to generate a 2D structure. Luminescent properties for the ligand cipt and compound 1 have also been discussed in detail.
基金supported by the National Natural Science Foundation of China(21671084)the Six talent peaks project in Jiangsu Province(2014-XCL-008)the Qing Lan Project of Jiangsu Province and the Foundation of Jiangsu Educational Committee(16KJB430011)。
文摘Two phase transition materials[iPrQ]2MnBr4(1,iPrQ=N-isopropyl-quinuclidinium)and[iPrQ]_(2)MnCl_(4)(2)were synthesized and characterized.Dielectric measurements and differential scanning calorimetry showed that the two compounds underwent reversible phase transitions at ca.–47 and–37℃,respectively.Variable-temperature single-crystal X-ray diffraction suggested that the two compounds underwent the same phase transitions from space group C2/c to Cc but at different temperature.The variable crystal structures indicated that the structural phase transitions of the compound were ascribed to the torsional movement of quinuclidine ring and the disappearance of the c-slide plane.The second harmonic generation(SHG)response further proved this structural phase transition.Fluorescence tests showed that the two compounds have strong fluorescence.The strong variations in dielectric anomalies make compounds 1 and 2 suitable for promising switchable dielectric materials.
基金supported by the National Natural Science Foundation of China (No. 20471008)the Excellent Young Scholars Research Fund of Beijing Institute of Technology (No. 000Y02-8)
文摘A dimeric coordination complex Cd2(ncpo)2(phen)2(H2O)2 was constructed by a flexible dicarboxylic acid, 2-nitro-4-carboxylphenoxyacetic acid. Its crystal structure was determined by X-ray single-crystal diffraction analysis. The crystal is of monoclinic system, space group P21/n with a = 17.2616(3), b = 12.7460(2), c = 18.4041(3) A^°, β= 94.432(1)°, C42H30Cd2N6O16, Mr = 1099.52, V = 4037.09(12)A^°^3 Dc = 1.809 g/cm^3, F(000) = 2192, μ = 1.139 cm^-1 and Z = 4. The final R = 0.0218 and wR = 0.0703 for 8288 observed reflections with I 〉 2σ(I). There are two crystallographically independent but structurally very similar molecules in the unit cell of the title complex. It is noticeable that the ligand ncpo^2- displays a good flexibility, demonstrating different modes from the rigid ligands. The luminescence property has been investigated, which shows photoluminescence at 465, 490 and 574 nm upon excitation at 320 nm in the solid state at room temperature.
基金supported by the National Natural Science Foundation of China(21503183,21663031,21373189)Dr.Scientific research Foundation of Yanan university(YDBK2015-02)the national and school level innovation programs funds of undergraduate for 2016(Nos.201610719031 and D2016010)
文摘One new coordination polymer(CP) [Cd(bct)(bib)]·2(H2O)(1), based on 3,5-bis(4'-carboxy-phenyl)-1,2,4-triazole(H2 bct) and 1,4-bis(imidazol-1-ylmethyl)benzene(bib), has been synthesized by hydrothermal method, and its structure was determined and characterized by single-crystal X-ray diffraction analysis, elemental analysis, IR spectroscopy, and thermogravimetric analysis. The crystal structure of CP 1 is a three-dimensional framework with(3,5)-connected topology, where the bct ligands adopt a μ3-kO,kO,kO coordination mode connecting with three Cd centers and the bib ligands adopt a μ2-k N,k N coordination mode bridging two Cd ions. It crystallizes in monoclinic system, space group C2/c, with a = 2.6838(4), b = 1.24221(17), c = 1.8011(2) nm, β = 102.939(2)o, V = 5.8522(13) nm^3, Z = 8, C30 H27 CdN7O6, Mr = 694.00, Dc = 1.566 g/cm^3, F(000) = 2784, S = 1.055, R = 0.0294 and wR = 0.0731. Furthermore, solid-state photoluminescence measurements show that CP 1 produces strong emissions at room temperature.
基金This work was supported by the National Natural Science Foundation of China (No. 20231020) and Natural Science Foundation of Fujian Province
文摘Two mixed-ligand polymeric complexes formulated as {[Zn(pda)(bpy)]·0.5H2O}n (pda = 1,4-phenylenediacetate, bpy = 2,2'-bipyridine) 1 and {[Cd(pda)(bpy)]·1.5H2O}n 2 have been hydrothermally synthesized. Single-crystal X-ray diffraction analyses reveal that the structures of complexes 1 and 2 possess similar one-dimensional zigzag chains. Crystal data for compound 1: monoclinic, space group P21/c, a = 15.965(2), b = 8.305(1), c= 14.856(2) °A, β= 111.048(2)°, Mr = 422.73, V = 1838.2(4)°A^3, Z = 4, Dc = 1.528 g/cm^3, μ= 1.368 mm^-1, F(000) = 868, the final R = 0.0783 and wR = 0.1469 (w =1/[σ^2(Fo^2) + (0.0351P)^2+ 8.0014P], where P = (Fo^2 + 2Fc^2)/3) based on 2025 observed reflections with I〉 2σ(I); and those for compound 2: monoclinic, space group C2/c, a = 29.921 (7), b = 8.5400(17), c = 15.320(3) °A,β= 99.59(3)°, Mr = 487.75, V = 3859.9(14) °A^3, Z = 8, Dc = 1.668 g/cm^3, μ= 1.169 mm^-1, F(000) = 1936, the final R = 0.0723 and wR = 0.1612 (w = 1/[σ^2(Fo^2) + (0.0681P)^2 + 55.9577P], where P = (Fo^2 + 2Fc^2)/3) based on 2130 observed reflections with I〉 2σ(I). Fluorescent analyses show that both complexes exhibit intense blue luminescence (λmax = 485 nm for 1 and 475 nm for 2) upon excitation at 330 nm.