The solvothermal reaction of CdCl2·2.5H2O with terephthalic acid yields two new three-dimensional(3D)cadmium(II)coordination polymers(CPs),namely{[Cd(C8H4O4)Cl]·C2H8N}n and[Cd(C8H4O4)]n,we use the abbreviati...The solvothermal reaction of CdCl2·2.5H2O with terephthalic acid yields two new three-dimensional(3D)cadmium(II)coordination polymers(CPs),namely{[Cd(C8H4O4)Cl]·C2H8N}n and[Cd(C8H4O4)]n,we use the abbreviations CP1 and CP2 to refer to them,respectively.The compounds are characterized in detail by single-crystal X-ray diffraction,powder X-ray diffraction,IR spectroscopy,elemental analysis and thermogravimetric analysis(TGA).The results indicate that compounds CP1 and CP2 are 3D frameworks,and both the compounds feature a uninodal 4-connected framework with a dia net.The empty spaces of such 3D framework are filed by the other two identical frameworks,leading to a 3-fold interpenetrated network.In addition,the photochemical properties of the frameworks are also investigated.The two frameworks show strong solid-state fluorescence emission at 463 and 503 nm,respectively,which are obvious red-shift compared to the emission of ligand.展开更多
A series of RE3+ (RE = Eu/Tb/Ce)-activated Sr4La(PO4)3O (SLPO) phosphors are synthesized with a high- temperature solid-state reaction method. The photoluminescence properties, thermal stability, morphology, an...A series of RE3+ (RE = Eu/Tb/Ce)-activated Sr4La(PO4)3O (SLPO) phosphors are synthesized with a high- temperature solid-state reaction method. The photoluminescence properties, thermal stability, morphology, and CIE values of the SLPO:EuS+/Tb3+/Ce3+ phosphors are investigated. Under 394 nm excitation, the SLPO:Eu3+ exhibits red emission, and the SLPO:Tb3+ presents a green emission upon 379 nm excitation, while Ce3+-doped SLPO has a broad emission band ranging from 370 to 650 nm under 337 nm excitation. The investigation results indicate that the SLPO:Eu3+/Tb3+/Ce3+ phosphors can be effectively excited by near- ultraviolet light and may have the potential to serve as red-, green-, and blue-emitting phosphors for applications in white light-emitting diodes.展开更多
Eu-doped ZnO nanoneedles with different doping concentrations were prepared via the facile hydrothermal method.The crystal structure,morphology and photoluminescence property of the ZnO nanoneedles were characterized ...Eu-doped ZnO nanoneedles with different doping concentrations were prepared via the facile hydrothermal method.The crystal structure,morphology and photoluminescence property of the ZnO nanoneedles were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),photoluminescence spectroscopy(PL) and Raman spectroscopy.The results show that the europium ions are incorporated into the crystal lattice of ZnO matrix in trivalent ions.The nanoneedles are 2-3 μm in length and 100 nm in the tip diameter.PL and Raman measurements indicate that higher Eu^3+ doping concentration may destroy the crystallization of the nanoneedles and decrease the ratio of IUV/IDLE,which is mainly due to the more defects in the doped ZnO nanoneedles.And the characteristic red emissions of Eu^3+ ions are found by the PL spectroscopy with the Eu^3+doping concentration increasing,which are attributed to the ^5D0→^7F0,^5D0→^7F1 and ^5D0→^7F2 transitions.展开更多
A new 3D coordination polymer, [Cd2(L)(bpb)2]n(1, H4L = 1,4-di(2,6-dimethyl-3,5-dicarboxypyridyl) benzene, bpb = 1,4-bis(4-pyridyl) benzene, has been hydrothermally synthesized and characterized by single-cry...A new 3D coordination polymer, [Cd2(L)(bpb)2]n(1, H4L = 1,4-di(2,6-dimethyl-3,5-dicarboxypyridyl) benzene, bpb = 1,4-bis(4-pyridyl) benzene, has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis, elemental analysis, TGA, IR spectroscopy and UV-Vis spectrum. Complex 1 crystallizes in orthorhombic, space group C2221, with a = 10.9393(12), b = 20.900(3), c = 20.027(2) A, β = 90°, V = 4578.9(9) A^3, Dc = 41.668 Mg/cm^3, Mr = 1149.74, F(000) = 2312.0, μ = 0.996 mm^(–1), Z = 4, the final R = 0.0316 and wR = 0.0786 for 4271 observed reflections with I 〉 2σ(I). Structural analysis shows that 1 possesses a 3D network based on the 2D layer bridged by L^4-ligands, while the 2D layers are composed of the adjacent 1D chains joined by L^4-ligand. The photoluminescent investigation indicates that one broad emission band with the maximum of 445 nm can be observed in 1. Moreover, compound 1 has high photocatalytic degradation effects on methylene blue under UV irradiation.展开更多
By a novel controlled combustion synthesis method, a large number of nanostructured ZnO whiskers with different morphologies, such as tetra-needles, long-leg tetra-needles and multi-needles, are prepared without any a...By a novel controlled combustion synthesis method, a large number of nanostructured ZnO whiskers with different morphologies, such as tetra-needles, long-leg tetra-needles and multi-needles, are prepared without any additive in open air at high temperature. The morphologies and crystalline structures of the as-prepared ZnO nanostructured whiskers are investigated by SEM and XRD. The possible growth mechanism on the nanostructured ZnO whiskers is proposed. The experimental results indicate that the dielectric constants and losses of the nanostructured ZnO whiskers are very low, demonstrating that the nanostructured ZnO whiskers are low-loss materials for microwave absorption in X-band. However, obvious microwave absorption in nanostructured ZnO whiskers is observed. The quasi-microantenna model may be attributed to the microwave absorption of the ZnO whiskers.展开更多
Two new coordination polymers {[Zn2L1(2,2'-bpy)2(H2O)2]·4H2O}n(1) and [Zn2L2(2,2'-bpy)2(H2O)2]n(2)(H4L1 = terphenyl-2,2',4,4'-tetracarboxylic acid, H4L2 = quarterphenyl-2,2',4,4'-tetracarboxyli...Two new coordination polymers {[Zn2L1(2,2'-bpy)2(H2O)2]·4H2O}n(1) and [Zn2L2(2,2'-bpy)2(H2O)2]n(2)(H4L1 = terphenyl-2,2',4,4'-tetracarboxylic acid, H4L2 = quarterphenyl-2,2',4,4'-tetracarboxylic acid, and 2,2'-bpy = 2,2'-bipyridine) have been synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction studies. Complex 1 displays 2D wavelike networks, which are further joined together through O–H···O hydrogen bonds to give a 3D supramolecular network. Complex 2 exhibits 1D ladder-like chains, and they are further joined together by π-π stacking and O–H···O hydrogen bonding interactions to form a 3D supramolecular network. The results indicate that the backbone of carboxylate ligands has significant effects on the formation and structure of the resulting functional coordination polymers. Additionally, thermal stability and photoluminescent properties of 1 and 2 are also investigated in detail.展开更多
Dipyrido [3, 2-a:2,3-c] phenazine moiety has been introduced as neutral ligand in europium complex. Therefore, a new europium complex with saturated emission, strong fluorescent intensity and good solubility was desi...Dipyrido [3, 2-a:2,3-c] phenazine moiety has been introduced as neutral ligand in europium complex. Therefore, a new europium complex with saturated emission, strong fluorescent intensity and good solubility was designed and synthesized for the first time. Its photoluminescence and UV properties were examined. The experimental results showed that this new Eu-complex could be used as red electroluminescent materials.展开更多
Two new 2D coordination polymers, [Zn(HL)(Hbpp)]n (1) mid [Cd(HL)(Hbpp)(H2O)]n (2) (H4L = 1,3-di(2,4-dicarboxyphenyl) benzene, bpp = 1,3-di(4-pyridyl)propane), have been hydrothermally synthesized ...Two new 2D coordination polymers, [Zn(HL)(Hbpp)]n (1) mid [Cd(HL)(Hbpp)(H2O)]n (2) (H4L = 1,3-di(2,4-dicarboxyphenyl) benzene, bpp = 1,3-di(4-pyridyl)propane), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis, elemental analysis, TGA and 1R spectroscopy. Complex 1 crystallizes in monoclinic, space group P21/n, with a = 13.1031(6), b = 14.7315(7), c = 15.0041(7) A, β = 91.202(1)°, V= 2895.6(2) A3, Dc = 1.532 g/cm3, Mr = 667.97, F(000) = 1376.0, μ = 0.909 mm-1, Z = 4, the final R = 0.0481 and wR = 0.1304 for 7027 observed reflections with 1 〉 2a(/). Complex 2 also belongs to the monoclinic space group P2Jn, with a = 13.6326(4), b = 14.6432(4), c = 14.9395(5)A, β = 93.132(1)°, V= 2977.84(16) A3, D, = 1.613 g/cm3, )14,. = 1445.98, F(000) = 733.0,/1 = 0.794 mm-1, Z = 2, the final R = 0.0283 and wR = 0.0784 for 7230 observed reflections with I 〉 2σ(I). Both complexes 1 and 2 form 2D net structures, which are further linked to form 3D supramolecular net structures via intermolecular hydrogen bonds and aromatic π-π stacking interactions.展开更多
A new coordination polymer [Ni(3-bpo)(m-bdc)(C2H5OH) 2]n(1,3-bpo = 2,5-bis(3-pyridyl) -1,3,4-oxadiazole,m-H2bdc = 1,3-benzenedicarboxylic acid) was solvothermally synthesi-zed and characterized by IR,TGA and...A new coordination polymer [Ni(3-bpo)(m-bdc)(C2H5OH) 2]n(1,3-bpo = 2,5-bis(3-pyridyl) -1,3,4-oxadiazole,m-H2bdc = 1,3-benzenedicarboxylic acid) was solvothermally synthesi-zed and characterized by IR,TGA and single-crystal X-ray diffraction. The title complex crystalli-zes in the orthorhombic system,space group Pnma with a = 7.786(3) ,b = 17.253(6) ,c = 18.478(6) ,V = 2481.9(14) A^3,Mr = 539.18,Dc = 1.443 g/cm^3,Z = 4,R = 0.0353 and wR = 0.0589. The m-bdc and 3-bpo bridge two Ni(Ⅱ) ions through two carboxylate groups and two pyridyl groups forming a 1D infinite double-sinusoidal chain along the c axis. The photoluminescence of 1 shows a large red shift compared to that of free ligands in the solid state.展开更多
A new cadmium(II) polymer based on imidazole derivative, formulated as [Cd(Hiba)2]n 1, H2iba = 4-(1-H-imidazol-2-yl) benzoic acid), has been synthesized under hydro- thermal conditions. The compound crystallize...A new cadmium(II) polymer based on imidazole derivative, formulated as [Cd(Hiba)2]n 1, H2iba = 4-(1-H-imidazol-2-yl) benzoic acid), has been synthesized under hydro- thermal conditions. The compound crystallizes in triclinic system, space group P1 with a = 7.062(4), b = 10.840(7), c = 13.099(8) A, a = 98.102(7), fl = 101.524(7), y = I07.961(7)°, V= 912.3(10) A3, Z = 2, Mr = 486.75, Dc = 1.772 Mg/m3,/t = 1.234 mm-1, F(000) = 484, the final R = 0.0735 and wR = 0.1739 for 2154 observed reflections with 1 〉 20(I). Polymer 1 consists of (Cd-Hiba)2 zigzag chains, which are further linked by hydrogen bonding to extend into a two-dimensional (2D) corrugated-shape sheet structure. The 2D structures are further connected into a 3D supramolecular edifice through hydrogen bonding. The polymer exhibits exceptional high thermal stability. The bulk purity of the materials of 1 was confirmed through the powder X-ray diffraction (PXRD) patterns. The luminescent property of polymer I has also been investigated.展开更多
A new complex [Cd2(L)2(Cl)2(H2O)]n(1) was synthesized by reacting CdCl2·2.5 H2O with 4-(1,2,4-triazol-4-yl)phenylacetic acid(HL) ligand.The structure of the complex was characterized by single-crystal...A new complex [Cd2(L)2(Cl)2(H2O)]n(1) was synthesized by reacting CdCl2·2.5 H2O with 4-(1,2,4-triazol-4-yl)phenylacetic acid(HL) ligand.The structure of the complex was characterized by single-crystal X-ray diffraction,IR spectroscopy,elemental analysis and PXRD.Complex 1 crystallizes in triclinic,space group P21/c with a = 11.4303(8),b = 14.1792(10),c = 14.6857(10) ?,β = 96.3780(10)o,V = 2365.4(3) A^3,Z = 4,C(20)H(16)Cl2N6O5Cd2,Mr = 716.09,Dc = 2.011 g/cm3,μ = 2.069 mm^-1,S = 1.051,F(000) = 1392,the final R = 0.0458 and wR = 0.0949 for 5402 observed reflections(I 〉 2σ(I)).Complex 1 is a two-dimensional(2D) layer structure and non-covalent bonding interactions such as C–H···π and π···π extend the 2D to form a three-dimensional supramolecular polymer.展开更多
A new metal-organic coordination polymer {[Nd(tci)(H2O)2]·2H2O}n(1) has been synthesized based on the flexible tricarboxylate ligand tris(2-carboxyethyl)isocyanuric acid(H3tci) and structurally characte...A new metal-organic coordination polymer {[Nd(tci)(H2O)2]·2H2O}n(1) has been synthesized based on the flexible tricarboxylate ligand tris(2-carboxyethyl)isocyanuric acid(H3tci) and structurally characterized by single-crystal X-ray diffraction analyses, elemental analysis, infrared spectra(IR), powder X-ray diffraction(PXRD) and thermogravimetric analysis(TGA). Complex 1 crystallizes in triclinic, space group P1 with a = 9.1648(11), b = 9.3326(12), c = 12.440(2) , C(12)H(20)N3O(13) Nd, Mr = 558.55, V = 886.9(2) 3, Z = 2, Dc = 2.092 g·cm-3, μ = 3.006 mm-1, F(000) = 554, 2.56〈θ〈25.00°, λ(Mo Kα) = 0.71073 , T = 293(2) K, the final R = 0.0662 and w R = 0.2071. X-ray diffraction analysis reveals that complex 1 is a two-dimensional layer, which is further assembled into a three-dimensional supramolecular architecture through hydrogen bonding interactions. The structure of complex 1 can be simplified as a rare 2-periodic uninodal {48·62} topology and a non-interpenetrating kgd topology. Furthermore, the thermal stability and photoluminescence property of 1 were investigated.展开更多
Solvothermal reaction of manganese(II) salt with monosodium 2-sulfoterephthalate(2-NaH2stp) and two multi-pyridine N-containing auxiliary ligands results in the formation of two new complexes formulated with [Mn2...Solvothermal reaction of manganese(II) salt with monosodium 2-sulfoterephthalate(2-NaH2stp) and two multi-pyridine N-containing auxiliary ligands results in the formation of two new complexes formulated with [Mn2(Hstp)2(bpp)2(H2O)4](1) and [Mn3(stp)2(tpy)3(H2O)](H2O)5(2)(bpp = benz-2,3-pyrimidine-[2,3-f]-1,10-phenanthroline, tpy = 2,2':6',2''-terpyridine). X-ray diffraction structural analyses of two complexes reveal their structural diversity(0D and 1D) due to the difference of auxiliary ligands. 1 is a discrete structure, in which the Mn(Ⅱ) ion is hexa-coordinated with one stp, one bpp ligand and two water molecules. Complex 2 is a one-dimensional(1D) chain-like structure with three crystallographically independent Mn(Ⅱ) ions. The photoluminescent properties could be assigned to the π-π* transition of 2-sulfoterephthalate ligands.展开更多
Solvothermal reaction of Pb(NO3)2·6H2O with rigid linear ligand terephthalic acid(H2pta) in N,N-dimethylformamide(DMF) produced a new three-dimensional(3D) lead(Ⅱ)coordination polymer[Pb2(pta)1.5(μ...Solvothermal reaction of Pb(NO3)2·6H2O with rigid linear ligand terephthalic acid(H2pta) in N,N-dimethylformamide(DMF) produced a new three-dimensional(3D) lead(Ⅱ)coordination polymer[Pb2(pta)1.5(μ4-OH)(DMF)]n 1,and its structure was characterized by single-crystal X-ray diffraction analyses.In polymer 1,the μ4-OH bridges the nearby lead(Ⅱ) ions into an infinite one-dimensional(1D) chain,and then the organic ligand pta^2- joins the neighbored chains into a 3D structure by two similar connection modes in different configurations.The solid-state photoluminescent studies revealed that 1 exhibits a strong greenish emission mainly originating from ligand-to-metal charge transfer between the delocalized π bonds of the aromatic carboxylate ligand pta^2- and the p orbitals of the Pb^2+ centers.展开更多
There are growing interests on phosphor thin films owing to their potential application in high-resolution devices such as cathode ray tubes and flat panel display devices. The solution-based sol-gel method is one of ...There are growing interests on phosphor thin films owing to their potential application in high-resolution devices such as cathode ray tubes and flat panel display devices. The solution-based sol-gel method is one of the most important techniques for the synthesis of various functional coating films. Compounds with the apatite structure are very suitable host lattices for various luminescent ions. Ca2RE8(SiO4)6O2 ( RE=Y, Gd, La ) is a kind of ternary rare-earth-metal silicate with oxyapatite structure, which has been used as host material for the luminescence of various rare earth and mercury-like ions. In this article, Ca2Gd8(SiO4)6O2:Dy^3+phosphor films were dip-coated on quartz glass substrates through the sol-gel process. X-ray diffraction (XRD), atomic force microscopy (AFM), photoluminescence (PL) spectra, as well as lifetimes were used to characterize the resulting films. AFM study revealed that the phosphor films consisted of homogeneous particles. The Dy^3+ showed its characteristic emission in crystalline phosphor films, i.e., ^4F9/2-^6H15/2 and ^4F9/2-^6H13/2.展开更多
A new Nd(Ⅲ) coordination polymer [Nd(pidc)(H2O)4]·pidc-·7H2O(1,pidc2-= 2-py-ridyl-4,5-imidazoledicarboxylate) has been synthesized by solvothermal reaction at 120 ℃ and structurally characterized.T...A new Nd(Ⅲ) coordination polymer [Nd(pidc)(H2O)4]·pidc-·7H2O(1,pidc2-= 2-py-ridyl-4,5-imidazoledicarboxylate) has been synthesized by solvothermal reaction at 120 ℃ and structurally characterized.The complex belongs to triclinic,space group P with a = 9.022(2),b = 13.731(3),c = 13.782(3) ,α = 70.87(3),β = 71.71(3),γ = 71.71(3),V = 1488.6(7) 3,Z = 2,Dc = 1.798 g/cm3,S = 1.04,μ = 1.839 mm-1,F(000) = 814,Mr = 805.76,Rint = 0.081 and wR = 0.1644 for 5242 observed reflections(I 〉 2(I)).Each Nd3+ ion is nine-coordinated by five O atoms from three pidc ligands,and four O atoms from lattice water molecules.Each pidc is coordinated to three Nd3+ ions with a μ3-κO:κO':κO",κO'"-μ2 coordination mode into 1D chains,which can be further built into a 3D framework through intermolecular N-H···O and O-H···O hydrogen bonds.Photolu-minescent studies have shown that 1 exhibits emission at 439 nm(λex = 395 nm).展开更多
Two new d;metal-based metal-organic frameworks,{[Zn;(btc);(bib);(H;O);]·2H;O};(1)and{[Cd;(btc);(bib);(H;O);]·6H;O};(2)(btc=1,3,5-benzenetricarboxylate anion,bib=1,4-bis(1-imidazolyl)benzene...Two new d;metal-based metal-organic frameworks,{[Zn;(btc);(bib);(H;O);]·2H;O};(1)and{[Cd;(btc);(bib);(H;O);]·6H;O};(2)(btc=1,3,5-benzenetricarboxylate anion,bib=1,4-bis(1-imidazolyl)benzene)have been prepared under hydrothermal conditions by the reactions of d;metal oxides of ZnO and CdO with the aromatic polycarboxylic H;btc and the N-heterocyclic bib.The two products were characterized by single-crystal X-ray diffraction analysis,elemental analysis,thermogravimetric analysis(TGA),and IR spectroscopy.Complexes 1 and 2 crystallize in monoclinic C2/c and triclinic P 1 space groups,respectively.1 shows a 3D framework,and the potential large voids of the 3D network lead to a 3-fold interpenetrating architecture.2 displays a 2D framework,and the adjacent 2D layers expand into a 3D supramulecular network via rich hydrogen bonds.Moreover,the luminescent properties of the two complexes are investigated in solid state.展开更多
ABSTRAC Two new complexes [Cd(2,4'-bpdc)(DPPZ)]2n·n H2O(1) and [Zn(2,4'-Hbpdc)2(DPPZ)]· H2O(DPPZ = dipyrido[3,2-a:2',3'-c]phenazine, 2,4'-H2bpdc = 2,4'-biphenyldicarboxylic acid) have been...ABSTRAC Two new complexes [Cd(2,4'-bpdc)(DPPZ)]2n·n H2O(1) and [Zn(2,4'-Hbpdc)2(DPPZ)]· H2O(DPPZ = dipyrido[3,2-a:2',3'-c]phenazine, 2,4'-H2bpdc = 2,4'-biphenyldicarboxylic acid) have been hydrothermally synthesized. The structure of complex 1 was determined by single-crystal X-ray diffraction diffraction and further characterized by elemental analysis, IR spectrum, powder X-ray diffraction(XRD) and single-crystal X-ray diffraction. Complex 1 has 1D chains, which are further connected by π-π stacking interactions of neighbouring chains, generating a steady 3D supramolecular structure. Complex 2 shows the isolated mononuclear units, which are further extended to a 2D supramolecular layered structure through π-π stacking interactions and hydrogen bonds. Furthermore, complexes 1 and 2 exhibit green photoluminescent properties at room temperature.展开更多
A new complex,[Cd(L)2(pbda)]n(1,L = 3-(2-pyridyl)-4-(p-methoxyphenyl)-5-(2-thienyl)-1,2,4-triazole,H2pbda = 1,4-benzenedicarboxylic acid),has been hydrothermally prepared and characterized by single-crysta...A new complex,[Cd(L)2(pbda)]n(1,L = 3-(2-pyridyl)-4-(p-methoxyphenyl)-5-(2-thienyl)-1,2,4-triazole,H2pbda = 1,4-benzenedicarboxylic acid),has been hydrothermally prepared and characterized by single-crystal X-ray diffraction,IR spectroscopy,elemental analysis and PXRD.The complex crystallizes in monoclinic,space group P21/c with a = 8.2929(9),b = 21.668(2),c = 10.9940(11) ,β = 90.242(2)o,V = 1975.5(4) 3,Z = 2,C44H32N8O6S2Cd,Mr = 945.30,Dc = 1.589 g/cm3,μ = 0.721 mm-1,S = 1.097,F(000) = 960,the final R = 0.0590 and wR = 0.1045 for 3846 observed reflections(I 2σ(I)).In the title complex,the rigid bridging pbda2-ligands utilize oxygen atoms of carboxylate groups to coordinate with Cd(II) atoms to form one-dimensional chains which are further interlinked into a three-dimension framework via the intermolecular weak interactions.Photoluminescence study revealed that complex 1 exhibits strong fluorescent emission band in the solid state at room temperature.展开更多
Two coordination polymers constructed from 3,4-thiophenedicarboxylic acid and bis(2-methyl imidazole) ligands, namely, {[Cd2(tdc)2(bip)2]·7H20}n (1) and [Cd(tdc)(bib)]n (2) (Hgtdc = 3,4-thiophenedi...Two coordination polymers constructed from 3,4-thiophenedicarboxylic acid and bis(2-methyl imidazole) ligands, namely, {[Cd2(tdc)2(bip)2]·7H20}n (1) and [Cd(tdc)(bib)]n (2) (Hgtdc = 3,4-thiophenedicarboxylic acid, bip = 1,3-bis-(imidazol-2-methyl)propane and bib = 1,4-bis(imidazol-2-methyl)butane), have been synthesized and structurally characterized by single-crystal X-ray diffraction. Structural analyses reveal that 1 exhibits a two-dimensional (2D) layered network with 3-connected (6,3) topology, which is further connected into a three- dimensional (3D) supramolecular structure by intermolecular hydrogen bonds. However, 2 features a 2D network which can be rationalized as a 4-connected sql net. The results indicate the subtle difference of auxiliary bis(imidazol-2-methyl) ligands may lead to diverse architectures. Moreover, they exhibit luminescence emission in the solid state at room temperature.展开更多
基金Natural Science Foundation of Fujian Province,China(No.2019J01774)Scientific Research Start-up Foundation of Fujian University of Technology,China(No.GY-Z19168)Research Development Foundation of Fujian University of Technology,China(No.GY-Z160120)。
文摘The solvothermal reaction of CdCl2·2.5H2O with terephthalic acid yields two new three-dimensional(3D)cadmium(II)coordination polymers(CPs),namely{[Cd(C8H4O4)Cl]·C2H8N}n and[Cd(C8H4O4)]n,we use the abbreviations CP1 and CP2 to refer to them,respectively.The compounds are characterized in detail by single-crystal X-ray diffraction,powder X-ray diffraction,IR spectroscopy,elemental analysis and thermogravimetric analysis(TGA).The results indicate that compounds CP1 and CP2 are 3D frameworks,and both the compounds feature a uninodal 4-connected framework with a dia net.The empty spaces of such 3D framework are filed by the other two identical frameworks,leading to a 3-fold interpenetrated network.In addition,the photochemical properties of the frameworks are also investigated.The two frameworks show strong solid-state fluorescence emission at 463 and 503 nm,respectively,which are obvious red-shift compared to the emission of ligand.
基金supported by the National Natural Science Foundation of China(NSFC)(No.11604115)the Educational Commission of Jiangsu Province of China(NO.17KJA460004)
文摘A series of RE3+ (RE = Eu/Tb/Ce)-activated Sr4La(PO4)3O (SLPO) phosphors are synthesized with a high- temperature solid-state reaction method. The photoluminescence properties, thermal stability, morphology, and CIE values of the SLPO:EuS+/Tb3+/Ce3+ phosphors are investigated. Under 394 nm excitation, the SLPO:Eu3+ exhibits red emission, and the SLPO:Tb3+ presents a green emission upon 379 nm excitation, while Ce3+-doped SLPO has a broad emission band ranging from 370 to 650 nm under 337 nm excitation. The investigation results indicate that the SLPO:Eu3+/Tb3+/Ce3+ phosphors can be effectively excited by near- ultraviolet light and may have the potential to serve as red-, green-, and blue-emitting phosphors for applications in white light-emitting diodes.
基金Supported by the National Natural Science Foundation of China(Nos.61178074, 61008051), the Program for the Development of Science and Technology of Jilin Province, China(Nos.20100113, 20140101205 JC) and the Natural Science Foundation of Jiangsu Province, China(No.BK2011513).
文摘Eu-doped ZnO nanoneedles with different doping concentrations were prepared via the facile hydrothermal method.The crystal structure,morphology and photoluminescence property of the ZnO nanoneedles were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),photoluminescence spectroscopy(PL) and Raman spectroscopy.The results show that the europium ions are incorporated into the crystal lattice of ZnO matrix in trivalent ions.The nanoneedles are 2-3 μm in length and 100 nm in the tip diameter.PL and Raman measurements indicate that higher Eu^3+ doping concentration may destroy the crystallization of the nanoneedles and decrease the ratio of IUV/IDLE,which is mainly due to the more defects in the doped ZnO nanoneedles.And the characteristic red emissions of Eu^3+ ions are found by the PL spectroscopy with the Eu^3+doping concentration increasing,which are attributed to the ^5D0→^7F0,^5D0→^7F1 and ^5D0→^7F2 transitions.
基金Supported by the National Natural Science Foundation of China(No.21373178 and 21503183)the Scientific Research Foundation of Shaanxi Provincial Education Department(No.16JK1857)the Natural Scientific Research Foundation of Yan’an City Technology Division of China(No.2016kg-01)
文摘A new 3D coordination polymer, [Cd2(L)(bpb)2]n(1, H4L = 1,4-di(2,6-dimethyl-3,5-dicarboxypyridyl) benzene, bpb = 1,4-bis(4-pyridyl) benzene, has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis, elemental analysis, TGA, IR spectroscopy and UV-Vis spectrum. Complex 1 crystallizes in orthorhombic, space group C2221, with a = 10.9393(12), b = 20.900(3), c = 20.027(2) A, β = 90°, V = 4578.9(9) A^3, Dc = 41.668 Mg/cm^3, Mr = 1149.74, F(000) = 2312.0, μ = 0.996 mm^(–1), Z = 4, the final R = 0.0316 and wR = 0.0786 for 4271 observed reflections with I 〉 2σ(I). Structural analysis shows that 1 possesses a 3D network based on the 2D layer bridged by L^4-ligands, while the 2D layers are composed of the adjacent 1D chains joined by L^4-ligand. The photoluminescent investigation indicates that one broad emission band with the maximum of 445 nm can be observed in 1. Moreover, compound 1 has high photocatalytic degradation effects on methylene blue under UV irradiation.
基金Supported by the National Natural Science Foundation of China under Grant Nos 50572010 and 10672020, the National Defense Founds under Grant Nos 51420205BQ0154, A2220061080), and the National Key Basic Research Programme of China under Grant No 5131803.
文摘By a novel controlled combustion synthesis method, a large number of nanostructured ZnO whiskers with different morphologies, such as tetra-needles, long-leg tetra-needles and multi-needles, are prepared without any additive in open air at high temperature. The morphologies and crystalline structures of the as-prepared ZnO nanostructured whiskers are investigated by SEM and XRD. The possible growth mechanism on the nanostructured ZnO whiskers is proposed. The experimental results indicate that the dielectric constants and losses of the nanostructured ZnO whiskers are very low, demonstrating that the nanostructured ZnO whiskers are low-loss materials for microwave absorption in X-band. However, obvious microwave absorption in nanostructured ZnO whiskers is observed. The quasi-microantenna model may be attributed to the microwave absorption of the ZnO whiskers.
基金Supported by the National Natural Science Foundation of China(No.21373178)the Natural Scientific Research Foundation of Shaanxi Provincial Education Office of China(No.13JS124)
文摘Two new coordination polymers {[Zn2L1(2,2'-bpy)2(H2O)2]·4H2O}n(1) and [Zn2L2(2,2'-bpy)2(H2O)2]n(2)(H4L1 = terphenyl-2,2',4,4'-tetracarboxylic acid, H4L2 = quarterphenyl-2,2',4,4'-tetracarboxylic acid, and 2,2'-bpy = 2,2'-bipyridine) have been synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction studies. Complex 1 displays 2D wavelike networks, which are further joined together through O–H···O hydrogen bonds to give a 3D supramolecular network. Complex 2 exhibits 1D ladder-like chains, and they are further joined together by π-π stacking and O–H···O hydrogen bonding interactions to form a 3D supramolecular network. The results indicate that the backbone of carboxylate ligands has significant effects on the formation and structure of the resulting functional coordination polymers. Additionally, thermal stability and photoluminescent properties of 1 and 2 are also investigated in detail.
基金This work was supported by the National Natural Science Foundation of China (No29992530-6) and Provincial Natural Science Foundation of Hunan (00JJY2043).
文摘Dipyrido [3, 2-a:2,3-c] phenazine moiety has been introduced as neutral ligand in europium complex. Therefore, a new europium complex with saturated emission, strong fluorescent intensity and good solubility was designed and synthesized for the first time. Its photoluminescence and UV properties were examined. The experimental results showed that this new Eu-complex could be used as red electroluminescent materials.
基金Supported by the National Natural Science Foundation of China(No.21373178)the Open Foundation of Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education(338080043)the Natural Scientific Research Foundation of Shaanxi Provincial Education Office of China(No.13JS124)
文摘Two new 2D coordination polymers, [Zn(HL)(Hbpp)]n (1) mid [Cd(HL)(Hbpp)(H2O)]n (2) (H4L = 1,3-di(2,4-dicarboxyphenyl) benzene, bpp = 1,3-di(4-pyridyl)propane), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis, elemental analysis, TGA and 1R spectroscopy. Complex 1 crystallizes in monoclinic, space group P21/n, with a = 13.1031(6), b = 14.7315(7), c = 15.0041(7) A, β = 91.202(1)°, V= 2895.6(2) A3, Dc = 1.532 g/cm3, Mr = 667.97, F(000) = 1376.0, μ = 0.909 mm-1, Z = 4, the final R = 0.0481 and wR = 0.1304 for 7027 observed reflections with 1 〉 2a(/). Complex 2 also belongs to the monoclinic space group P2Jn, with a = 13.6326(4), b = 14.6432(4), c = 14.9395(5)A, β = 93.132(1)°, V= 2977.84(16) A3, D, = 1.613 g/cm3, )14,. = 1445.98, F(000) = 733.0,/1 = 0.794 mm-1, Z = 2, the final R = 0.0283 and wR = 0.0784 for 7230 observed reflections with I 〉 2σ(I). Both complexes 1 and 2 form 2D net structures, which are further linked to form 3D supramolecular net structures via intermolecular hydrogen bonds and aromatic π-π stacking interactions.
基金supported by the Shanghai Leading Academic Discipline Project B 108 and Science & Technology Commission of Shanghai Municipality (08DZ2270500)
文摘A new coordination polymer [Ni(3-bpo)(m-bdc)(C2H5OH) 2]n(1,3-bpo = 2,5-bis(3-pyridyl) -1,3,4-oxadiazole,m-H2bdc = 1,3-benzenedicarboxylic acid) was solvothermally synthesi-zed and characterized by IR,TGA and single-crystal X-ray diffraction. The title complex crystalli-zes in the orthorhombic system,space group Pnma with a = 7.786(3) ,b = 17.253(6) ,c = 18.478(6) ,V = 2481.9(14) A^3,Mr = 539.18,Dc = 1.443 g/cm^3,Z = 4,R = 0.0353 and wR = 0.0589. The m-bdc and 3-bpo bridge two Ni(Ⅱ) ions through two carboxylate groups and two pyridyl groups forming a 1D infinite double-sinusoidal chain along the c axis. The photoluminescence of 1 shows a large red shift compared to that of free ligands in the solid state.
基金supported by the National Natural Science Foundation of China (No. 21271098, 21071074 and 20871042)Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20104104110004)Natural Science Foundation of the Education Department of Henan Province (No 2011A150019 and 2008B430012)
文摘A new cadmium(II) polymer based on imidazole derivative, formulated as [Cd(Hiba)2]n 1, H2iba = 4-(1-H-imidazol-2-yl) benzoic acid), has been synthesized under hydro- thermal conditions. The compound crystallizes in triclinic system, space group P1 with a = 7.062(4), b = 10.840(7), c = 13.099(8) A, a = 98.102(7), fl = 101.524(7), y = I07.961(7)°, V= 912.3(10) A3, Z = 2, Mr = 486.75, Dc = 1.772 Mg/m3,/t = 1.234 mm-1, F(000) = 484, the final R = 0.0735 and wR = 0.1739 for 2154 observed reflections with 1 〉 20(I). Polymer 1 consists of (Cd-Hiba)2 zigzag chains, which are further linked by hydrogen bonding to extend into a two-dimensional (2D) corrugated-shape sheet structure. The 2D structures are further connected into a 3D supramolecular edifice through hydrogen bonding. The polymer exhibits exceptional high thermal stability. The bulk purity of the materials of 1 was confirmed through the powder X-ray diffraction (PXRD) patterns. The luminescent property of polymer I has also been investigated.
基金supported by the Natural Science Foundation of Colleges of Anhui Province(KJ2017ZD29)National Undergraduates Innovation Project(201510371010)
文摘A new complex [Cd2(L)2(Cl)2(H2O)]n(1) was synthesized by reacting CdCl2·2.5 H2O with 4-(1,2,4-triazol-4-yl)phenylacetic acid(HL) ligand.The structure of the complex was characterized by single-crystal X-ray diffraction,IR spectroscopy,elemental analysis and PXRD.Complex 1 crystallizes in triclinic,space group P21/c with a = 11.4303(8),b = 14.1792(10),c = 14.6857(10) ?,β = 96.3780(10)o,V = 2365.4(3) A^3,Z = 4,C(20)H(16)Cl2N6O5Cd2,Mr = 716.09,Dc = 2.011 g/cm3,μ = 2.069 mm^-1,S = 1.051,F(000) = 1392,the final R = 0.0458 and wR = 0.0949 for 5402 observed reflections(I 〉 2σ(I)).Complex 1 is a two-dimensional(2D) layer structure and non-covalent bonding interactions such as C–H···π and π···π extend the 2D to form a three-dimensional supramolecular polymer.
文摘A new metal-organic coordination polymer {[Nd(tci)(H2O)2]·2H2O}n(1) has been synthesized based on the flexible tricarboxylate ligand tris(2-carboxyethyl)isocyanuric acid(H3tci) and structurally characterized by single-crystal X-ray diffraction analyses, elemental analysis, infrared spectra(IR), powder X-ray diffraction(PXRD) and thermogravimetric analysis(TGA). Complex 1 crystallizes in triclinic, space group P1 with a = 9.1648(11), b = 9.3326(12), c = 12.440(2) , C(12)H(20)N3O(13) Nd, Mr = 558.55, V = 886.9(2) 3, Z = 2, Dc = 2.092 g·cm-3, μ = 3.006 mm-1, F(000) = 554, 2.56〈θ〈25.00°, λ(Mo Kα) = 0.71073 , T = 293(2) K, the final R = 0.0662 and w R = 0.2071. X-ray diffraction analysis reveals that complex 1 is a two-dimensional layer, which is further assembled into a three-dimensional supramolecular architecture through hydrogen bonding interactions. The structure of complex 1 can be simplified as a rare 2-periodic uninodal {48·62} topology and a non-interpenetrating kgd topology. Furthermore, the thermal stability and photoluminescence property of 1 were investigated.
基金supported by the Postdoctoral Science Foundation of China(No.2014M562403)National Natural Science Foundation of China(No.21573189)
文摘Solvothermal reaction of manganese(II) salt with monosodium 2-sulfoterephthalate(2-NaH2stp) and two multi-pyridine N-containing auxiliary ligands results in the formation of two new complexes formulated with [Mn2(Hstp)2(bpp)2(H2O)4](1) and [Mn3(stp)2(tpy)3(H2O)](H2O)5(2)(bpp = benz-2,3-pyrimidine-[2,3-f]-1,10-phenanthroline, tpy = 2,2':6',2''-terpyridine). X-ray diffraction structural analyses of two complexes reveal their structural diversity(0D and 1D) due to the difference of auxiliary ligands. 1 is a discrete structure, in which the Mn(Ⅱ) ion is hexa-coordinated with one stp, one bpp ligand and two water molecules. Complex 2 is a one-dimensional(1D) chain-like structure with three crystallographically independent Mn(Ⅱ) ions. The photoluminescent properties could be assigned to the π-π* transition of 2-sulfoterephthalate ligands.
基金supported by the Natural Science Foundation of Fujian province(2015J01033)Industry-University Cooperation Key Project of Science and Technology of Fujian Province(2012H6002)
文摘Solvothermal reaction of Pb(NO3)2·6H2O with rigid linear ligand terephthalic acid(H2pta) in N,N-dimethylformamide(DMF) produced a new three-dimensional(3D) lead(Ⅱ)coordination polymer[Pb2(pta)1.5(μ4-OH)(DMF)]n 1,and its structure was characterized by single-crystal X-ray diffraction analyses.In polymer 1,the μ4-OH bridges the nearby lead(Ⅱ) ions into an infinite one-dimensional(1D) chain,and then the organic ligand pta^2- joins the neighbored chains into a 3D structure by two similar connection modes in different configurations.The solid-state photoluminescent studies revealed that 1 exhibits a strong greenish emission mainly originating from ligand-to-metal charge transfer between the delocalized π bonds of the aromatic carboxylate ligand pta^2- and the p orbitals of the Pb^2+ centers.
基金supported by the Guidance Plan of Science and Technology Research and Development of Hebei Province (2005-2007)
文摘There are growing interests on phosphor thin films owing to their potential application in high-resolution devices such as cathode ray tubes and flat panel display devices. The solution-based sol-gel method is one of the most important techniques for the synthesis of various functional coating films. Compounds with the apatite structure are very suitable host lattices for various luminescent ions. Ca2RE8(SiO4)6O2 ( RE=Y, Gd, La ) is a kind of ternary rare-earth-metal silicate with oxyapatite structure, which has been used as host material for the luminescence of various rare earth and mercury-like ions. In this article, Ca2Gd8(SiO4)6O2:Dy^3+phosphor films were dip-coated on quartz glass substrates through the sol-gel process. X-ray diffraction (XRD), atomic force microscopy (AFM), photoluminescence (PL) spectra, as well as lifetimes were used to characterize the resulting films. AFM study revealed that the phosphor films consisted of homogeneous particles. The Dy^3+ showed its characteristic emission in crystalline phosphor films, i.e., ^4F9/2-^6H15/2 and ^4F9/2-^6H13/2.
基金Funded by the National Natural Science Foundation of China (No.21101035)Natural Science Foundation of Guangxi Province (2010GXNSFF013001)+1 种基金State Key Laboratory of Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources,Ministry of Science and Technology of China (CMEMR2011-23)the Natural Science Foundation of the Education Committee of Guangxi Province (No.201010LX074)
文摘A new Nd(Ⅲ) coordination polymer [Nd(pidc)(H2O)4]·pidc-·7H2O(1,pidc2-= 2-py-ridyl-4,5-imidazoledicarboxylate) has been synthesized by solvothermal reaction at 120 ℃ and structurally characterized.The complex belongs to triclinic,space group P with a = 9.022(2),b = 13.731(3),c = 13.782(3) ,α = 70.87(3),β = 71.71(3),γ = 71.71(3),V = 1488.6(7) 3,Z = 2,Dc = 1.798 g/cm3,S = 1.04,μ = 1.839 mm-1,F(000) = 814,Mr = 805.76,Rint = 0.081 and wR = 0.1644 for 5242 observed reflections(I 〉 2(I)).Each Nd3+ ion is nine-coordinated by five O atoms from three pidc ligands,and four O atoms from lattice water molecules.Each pidc is coordinated to three Nd3+ ions with a μ3-κO:κO':κO",κO'"-μ2 coordination mode into 1D chains,which can be further built into a 3D framework through intermolecular N-H···O and O-H···O hydrogen bonds.Photolu-minescent studies have shown that 1 exhibits emission at 439 nm(λex = 395 nm).
基金Supported by the National Natural Science Foundation of China(No.21373178,21663031 and 21503183)the Scientific Research Foundation of Shaanxi Provincial Education Department(No.16JK1857)the Natural Scientific Research Foundation of Yan’an City Technology Division of China(No.2016kg-01)
文摘Two new d;metal-based metal-organic frameworks,{[Zn;(btc);(bib);(H;O);]·2H;O};(1)and{[Cd;(btc);(bib);(H;O);]·6H;O};(2)(btc=1,3,5-benzenetricarboxylate anion,bib=1,4-bis(1-imidazolyl)benzene)have been prepared under hydrothermal conditions by the reactions of d;metal oxides of ZnO and CdO with the aromatic polycarboxylic H;btc and the N-heterocyclic bib.The two products were characterized by single-crystal X-ray diffraction analysis,elemental analysis,thermogravimetric analysis(TGA),and IR spectroscopy.Complexes 1 and 2 crystallize in monoclinic C2/c and triclinic P 1 space groups,respectively.1 shows a 3D framework,and the potential large voids of the 3D network lead to a 3-fold interpenetrating architecture.2 displays a 2D framework,and the adjacent 2D layers expand into a 3D supramulecular network via rich hydrogen bonds.Moreover,the luminescent properties of the two complexes are investigated in solid state.
基金Supported by the Program for NNSFC(21407064,21576112)NSF of Jilin Province(20130521019JH)the Science and Technology Development Plan of Siping City(2014052,2015049)
文摘ABSTRAC Two new complexes [Cd(2,4'-bpdc)(DPPZ)]2n·n H2O(1) and [Zn(2,4'-Hbpdc)2(DPPZ)]· H2O(DPPZ = dipyrido[3,2-a:2',3'-c]phenazine, 2,4'-H2bpdc = 2,4'-biphenyldicarboxylic acid) have been hydrothermally synthesized. The structure of complex 1 was determined by single-crystal X-ray diffraction diffraction and further characterized by elemental analysis, IR spectrum, powder X-ray diffraction(XRD) and single-crystal X-ray diffraction. Complex 1 has 1D chains, which are further connected by π-π stacking interactions of neighbouring chains, generating a steady 3D supramolecular structure. Complex 2 shows the isolated mononuclear units, which are further extended to a 2D supramolecular layered structure through π-π stacking interactions and hydrogen bonds. Furthermore, complexes 1 and 2 exhibit green photoluminescent properties at room temperature.
基金supported by the National Natural Science Foundation of China (No. 21171040)the Natural Science Foundation of Anhui Provincial Education Commission (No. KJ2011B296 and KJ2009A047ZC)
文摘A new complex,[Cd(L)2(pbda)]n(1,L = 3-(2-pyridyl)-4-(p-methoxyphenyl)-5-(2-thienyl)-1,2,4-triazole,H2pbda = 1,4-benzenedicarboxylic acid),has been hydrothermally prepared and characterized by single-crystal X-ray diffraction,IR spectroscopy,elemental analysis and PXRD.The complex crystallizes in monoclinic,space group P21/c with a = 8.2929(9),b = 21.668(2),c = 10.9940(11) ,β = 90.242(2)o,V = 1975.5(4) 3,Z = 2,C44H32N8O6S2Cd,Mr = 945.30,Dc = 1.589 g/cm3,μ = 0.721 mm-1,S = 1.097,F(000) = 960,the final R = 0.0590 and wR = 0.1045 for 3846 observed reflections(I 2σ(I)).In the title complex,the rigid bridging pbda2-ligands utilize oxygen atoms of carboxylate groups to coordinate with Cd(II) atoms to form one-dimensional chains which are further interlinked into a three-dimension framework via the intermolecular weak interactions.Photoluminescence study revealed that complex 1 exhibits strong fluorescent emission band in the solid state at room temperature.
基金supported by the National Natural Science of Foundation of China(No.21305060)
文摘Two coordination polymers constructed from 3,4-thiophenedicarboxylic acid and bis(2-methyl imidazole) ligands, namely, {[Cd2(tdc)2(bip)2]·7H20}n (1) and [Cd(tdc)(bib)]n (2) (Hgtdc = 3,4-thiophenedicarboxylic acid, bip = 1,3-bis-(imidazol-2-methyl)propane and bib = 1,4-bis(imidazol-2-methyl)butane), have been synthesized and structurally characterized by single-crystal X-ray diffraction. Structural analyses reveal that 1 exhibits a two-dimensional (2D) layered network with 3-connected (6,3) topology, which is further connected into a three- dimensional (3D) supramolecular structure by intermolecular hydrogen bonds. However, 2 features a 2D network which can be rationalized as a 4-connected sql net. The results indicate the subtle difference of auxiliary bis(imidazol-2-methyl) ligands may lead to diverse architectures. Moreover, they exhibit luminescence emission in the solid state at room temperature.