Synthesis,Crystal Structure and Luminescent Property of Cadmium Complex Based on 2-(2-(1Hbenzo[d]imidazol-2-yl)benzyl)-1H-benzo[d]-imidazole

The complex [Cd（bbb）Cl2]·DMF·H2O, where bbb is 2-（2-（1H-benzo[d]imidazol-2-yl）benzyl）-1H-benzo[d]imidazole, was synthesized and characterized by X-ray single-crystal structure analyses. For the complex： C24H25Cl2CdN5O2, Mr = 598.77, crystal system, triclinic, space group P1, a = 9.9878（12）, b = 10.0008（12）, c = 13.2217（15） , α = 80.674（2）, β = 72.158（2）, γ = 86.776（2）°, V = 1240.5（3） 3, Z = 2, Dc = 1.598 g/cm3, λ = 0.71073, μ（MoKα） = 1.127 mm–1, F（000） = 600, S = 1.04, R = 0.0905 and wR = 0.3088 for 4805 observed reflections with I 〉 2σ（I）. It is a neutral complex. The distorted tetrahedral geometry of cadmium ion is coordinated by two nitrogen atoms of ligand and two chloride ions. The complex emits blue green luminescence with emission peaks at 480 nm in DMF solution.

Synthesis, Crystal Structure and Luminescent Property of a Dinuclear Cadmium Complex Based on 1,2,3,4-Tetra(1H-benzo[d]imidazol-2-yl)butane

A complex [Cd2（tbb）C14]·4DMF·3H2O, where tbb is 1,2,3,4-tetra（1H-benzo[d]imi- dazol-2-yl）butane, was synthesized and characterized by X-ray single-crystal structure analyses. For this complex： C44H49Cd2C14N12OT, Mr= 1224.55, monoclinie system, space group C2/c, a = 29.563（3）, b = 14.2580（17）, c = 26.355（3） A,β = 97.036（2）°, V = 11025（2） A3, Z = 8, D,.= 1.475 g/cm3, 2 = 0.71073 A, IL（MoKa） = 1.021 mm-1, F（000） = 4936, S = 1.047, R = 0.0680 and wR = 0.1832 for 11812 observed reflections with I 〉 2σ（I）. It is a neutral dinuclear complex. One 1,2,3,4-tetra（1H-benzo[d]imidazol-2-yl）butane coordinates to two cadmium ions. Each cadmium ion is coordinated by two nitrogen atoms of tbb and two chloride ions. The complex emits blue luminescence in DMF solution as well as in solid powder state.

Synthesis, Crystal Structure and Luminescent Property of a Dinuclear Cadmium Complex Based on 1,2-Bis(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene

A dinuclear cadmium complex [Cd2（bpbb）2Cl2（μ-Cl2）], where bpbb is 1,2-bis（1-phenyl-1H-benzo[d]imidazol-2-yl）benzene, was synthesized and characterized by X-ray singlecrystal structure analyses. Crystal data： C（64）H（44）Cd2Cl4N8, Mr = 1291.67, triclinic system, space group P1, a = 10.076（3）, b = 12.730（4）, c = 13.176（4） A, α = 99.087（3）, β = 109.859（3）, γ = 112.551（3）°, V = 1384.8（7） A3, Z = 1, Dc = 1.549 g/cm^3, λ = 0.71073 A, μ（Mo Kα） = 1.010 mm^（–1）, F（000） = 648, S = 1.062, R = 0.0425 and wR = 0.1130 for 9688 observed reflections with I 〉 2s（I）. One 1,2-bis（1-phenyl-1H-benzo[d]imidazol-2-yl）benzene coordinates to one cadmium ion. The cadmium is five-coordinated by three chloride ions and two nitrogen atoms from bpbb. Each cadmium ion is bridged by two chloride ions. The decomposition temperature is up to 420 ℃. The complex emits blue luminescence in DMF solution and in solid powder state.

Crystal Structure and Photoluminescence of a New Cadmium Complex with 6,7-Dicyanodipyridoquinoxalin

The reaction of CdCl2 with 6,7-dicyanodipyridoquinoxaline （DICNQ） by solvothermal reaction gives rise to a coordination polymer [CdCl2（DICNQ）]n 1. Single-crystal X-ray diffraction analysis reveals that the compound in space group Pbcn creates 1-D chloro-bridging chains. Crystal data for 1： a = 6.756（1）, b = 35.371（6）, c = 7.027（1）A , V = 1679.1（5） A^3, Z = 4.00, C16H6CdCl2N6, Mr = 465.57, Dc = 1.842 g/cm^3, μ = 1.630 mm-1, F（000） = 904, S = 1.005 and T = 293（2） K. The final R = 0.0376 and wR = 0.1029 for 1291 observed reflections with I 〉 2σ（I）, and R = 0.0499 and wR = 0.1125 for all data. The 1-D chloro-bridging chains are parallel-stacked in the a and b directions, and further stabilized through π-stacking interactions, hydrogen-bonding interactions and C≡N···π interactions to generate a 3-D structure. Compound 1 displays intense bluish-green photoluminescence from the intraligand charge-transfer of the DICNQ ligand and the Cl--to-DICNQ charge-transfer mechanism which is probed by the density of states （DOS） calculations.

Spectrophotometric Investigation of Cadmium Complex Solutionwith m-Bromobenzenediazoaminoazobenzene

The synthesis of a new ligand, m-bromobenzenediazoaminoazobenzene (m-BBDA) was carried out. The reaction between m-BBDA and cadmium(II) was sensitive at pH over 12 and in the presence of emulsifier OP. Because of the high interference of excess of ligand beta-correction theory was applied instead of the single wavelength method. This study gave the simple determination of the complex ratio, real molar absorptivity (epsilon) and step or cumulative stability constant (K).

Synthesis, Crystal Structure and Luminescent Property of a Dinuclear Cadmium Complex Based on 2-(2-(1H-Benzo[d]imidazol-2-yl)-phenyl)-1-phenyl-1H-benzo[d]imidazole

A dinuclear cadmium complex [Cd_2（bppb）Cl_4×2DMF]（1）, where bppb is 2-（2-（1 Hbenzo[d]imidazol-2-yl）phenyl）-1-phenyl-~1 H-benzo[d]imidazole, was synthesized and characterized by X-ray single-crystal structure analyses. For 1： C_（58） H_（50） Cd_2 Cl_4 N_（10） O_2, M_r = 1285.68, monoclinic system, space group P2_1/n, a = 16.136（3）, b = 10.612（2）, c = 16.270（3） ？, β = 96.209（2）°, V = 2769.7（9） ？~3, Z = 2, D_c = 1.542 g/cm^3, λ = 0.71073 ？, μ（Mo Kα） = 1.013 mm^（–1）, F（000） = 1296, S = 1.055, R = 0.0393 and wR = 0.1185 for 4876 observed reflections with I 〉 2σ（I）. One 9 mium ion which is five-coordinated by three chloride ions and two nitrogen atoms from bppb. Two cadmium ions are bridged by two chloride ions. The Cd_2（bppb）_2 Cl_2（μ-Cl_2） decomposes at 350 ℃ which is much lower by 70 ℃ than [Cd_2（bpbb）_2 Cl_2（μ-Cl_2）]（420 ℃）. The complex emits blue luminescence in both DMF solution and solid powder. Phenyl ring substituting NH hydrogen atom of benzimidazole group in ligand can not obviously change the UV-vis and luminescence spectra peaks location of the benzimidazole cadmium complex.

Syntheses and Structures of Two Cadmium Complexes with Isophthaloylbisglycine Acid and 4,4'-Bipyridine

The two title complexes [{Cd（IBG-CH3）（4,4＇-bipy）（H2O）2}·NO3]n 1 and [{Cd（IBG）- （4,4＇-bipy）（H2O）2}·2H2O]n 2 （H2IBG = isophthaloylbisglycine and 4,4＇-bipy = 4,4＇-bipyridine） have been synthesized and characterized by single-crystal structure determination,IR and TG analyses. Complex 1 crystallizes in monoclinic,space group C2/c with a = 27.221（2）,b = 11.6093（7）,c = 16.3571（9）A,V = 5149.2（6） A^3,Z = 8,C23H23N5O11Cd,Mr = 657.86,Dc = 1.697 g/cm^3,F（000） = 2656.00,μ（MoKα） = 0.919 mm^-1,the final R = 0.0478 and wR = 0.0882 for 3728 observed reflections with I 〉 2σ（I）. Complex 2 crystallizes in triclinic,space group Pī with a = 9.0940（4）,b = 11.6852（5）,c = 13.1119（6）A,V = 1230.26 A^3,Z = 2,C22H26N4O10Cd,Mr = 618.87,Dc = 1.671 g/cm^3,F（000） = 628.0,μ（MoKα） = 0.951 mm^-1,the final R = 0.0567 and wR = 0.1124 for 3713 observed reflections with I 〉 2σ（I）. In both structures,the CdII metal centers are coordinated by seven atoms to form a distorted pentagonal bipyramidal geometry.

Synthesis and Uncommon Structural Characterization of Novel Zinc and Cadmium Complexes with Imino Nitroxide Radical

Two novel complexes {[Zn（IM4py）2（tp）（H2O）]2H2O}. 1 and {[Cd（IM4py）2（tp）- （H2O）]1.25H2O},, 2 （IM4py = 2-（4＇-pyridinyl）-4,4,5,5-tetramethylimidazoline-l-oxyl and tp = terephthalate dianion） have been synthesized and characterized by elemental analyses, IR spectrum and single-crystal X-ray diffraction. Crystal data for complex I： monoclinic, space group C2/c, a = 20.648（7）, b = 12.130（4）, c = 14.036（4） A, β = 106.351（5）°, C32H42N6O9Zn, Mr = 720.09, V = 3373.3（2） A3, Z= 4, Dc = 1.418 g/cm^3μt（MoKα） = 0.790 mm^-1, F（000） = 1512, the final R = 0.0407 and wR = 0.0894 for 3480 independent reflections with Rint = 0.0432. Crystal data for complex 2： monoclinic, space group C2/c, a = 21.332（6）, b = 12.063（3）, c = 14.246（4） A, β = 106.704（4）°, C32H40.50N6O8.25Cd, Mr = 753.60, V= 3511.2（2） A^3, Z = 4, Dc = 1.426 g/cm^3,μ（MoKα） = 0.679 mm^--1, F（000） = 1554, the final R = 0.0419 and wR = 0.0961 for 3627 independent reflections with Rint = 0.0440. The framework structures of complexes 1 and 2 are 3-D networks via the hydrogen bonds among 1-D chains. The notable characteristics of the two complexes are that the coordination polyhedron of Zn（Ⅱ） adopts a rare distorted five-coordinate square pyramidal geometry in 1, and the Cd（Ⅱ） complex exhibits an unusual distorted seven-coordinate pentagonal bipyramid in 2.

Synthesis and Crystal Structure of Dinuclear Cadmium Complex [Cd_2(phen)_4(fca)_2](ClO_4)_2(H_2O)_2

A novel complex [Cd2(phen)4(fca)2](ClO4)2(H2O)2 (fca = dianion of 3-ferrocenyl- 2-crotonic acid, phen = 1,10-phenanthroline) has been synthesized and characterized by X-ray single-crystal structure analysis. It crystallizes in triclinic system, space group P?with a = 11.6297(5), b = 12.5165(5), c = 13.8986(6) ? a = 63.345(1), b = 87.747(1), g = 71.862(1), V = 1706.20(1) ?, Z = 1, Dc = 1.673 g/cm3, F(000) = 868 and m(MoKa) = 1.185 mm-1 (l = 0.71073 ). R = 0.0800 and wR = 0.1793 for 7653 observed reflections (I > 2s(I)). The structure consists of a dinuclear cation [Cd2(phen)4(fca)2]2+, two discrete perchlorate anions and two water molecules. The cationic part of the complex shows a tetrametallic core in which two fca groups act as the (O, O) bridging ligands between two cadmium(Ⅱ) ions with a distorted octahedral environment. The Cd…Cd intradimer distance is 4.128 ?

Structure of Trinuclear Cadmium Complex withAcetato and Pyridine Ligands

The crystal of the title complex with formula C48H52N8O16CI2Cd3(Mr=1405. 10) was crystallized in monoclinic, space group P21/n, with a=12. 666 (3), b=18. 306(6), c=13. 231 (4) A, p=111. 68(3), V=2851 (2) A3, Z=2, Dr=1. 637 g/cm-3 p=12. 680 cm-1, F(000)=1404. The final refinement is convergedwith R=0. 052 and Rw=0. 055. In the molecule [Cd3(py8(Oac)4] (CIO4)2, the aver-age values of Cd-N and Cd-O bonds are 2. 306 and 2. 288 A, respectively. In thecanon of the title complex. each Cd atom is coordinated by N and O atoms, which arefrom pyridine molecules and acetatoes, respectively, to form a distorted octahedron.And three Cd atoms are linked by two u2-O atoms of two acetatoes and other two u-ac-etato side bridges.

Hydrothermal Synthesis, Crystal Structure and Luminescence Properties of a New 2D Cadmium Complex Based on the 4,4'-Bis(benzimidazol-1-ylmethy1)biphenyl and Glutaric Acid Ligands

A new polymeric complex {[Cd2（bbmb）2（gt）2]＇（H2O）2}, （bbmb = 4,4＇-bis（benzimidazol-l-ylmethyl）biphenyl, H2gt = glutaric acid） has been obtained by hyclrothermal method and structurally characterized by elemental analysis, IR, XRD, TGA and single-crystal X-ray diffraction. The complex belongs to the triclinic system, space group P1 with a = 10.2417（15）, b = 13.752（2）, c = 22.201（3） A, a = 73.899（2）, β = 88.416（2）, y = 78.305（2）°, V = 2940.4（7） A3, Z = 2, C66H56Cd2N808, Mr = 1313.99, Dc = 1.484 g/cm3, F（000） = 1336 and μ = 0.787 mm-1, and features a 2D network. In the solid state at room temperature, the cadmium（Ⅱ） complex exhibits strong fluorescence absorption at 435 nm （λmax）.

Syntheses,Structures and Luminescent Properties of the Cadmium(Ⅱ)Complex with 3,3'-Thiodipropionic Acid

One new luminescent material of complex {[Cd（DPA）（H_2O）_2]·（H_2O）_2}_n（1） was synthesized by evaporation methods using 3,3A-thiodipropionic acid（DPA） and cadmium nitrate as the starting materials. Compound 1 crystallizes in the monoclinic system,space group P2_1/n with a = 7.5460（7）,b = 13.372（3）,c = 12.304（3） A,β = 95.95（3）o,V = 1234.8（4） A^3,D_c = 1.940 g/cm^3,C_6H_（16）O_8 SCd,M_r = 360.65,F（000） = 720,μ（Mo Ka） = 1.960 mm^-1,Z = 4,R = 0.0460 and wR = 0.1185 for 1835 observed reflections（I 〉 2σ（I））,and R = 0.0591,wR = 0.1245 for all data. The complex has been characterized by elemental analysis,FT-IR,TG,PXRD and X-ray single-crystal structure analysis and the fluorescence property has also been studied. As a result,complex 1 possesses a two-dimensional（2-D） structure through DPA ligands interconnecting Cd2＋ ions. Complex 1 emits the intense fluorescence of 420 nm in the solid state at room temperature.

Crystal Structure and Photoluminescence of a Tetranuclear Cadmium Complex

A novel tetranuclear cadmium complex （[{Cd（CIsHsOTS）（H20）（DMSO）}3{Cd（CtsH807S）（H20）2}]. 3DMSO.H20） was obtained by the self-assembly of Cd（II） with 5,7-dihydroxyflavone-6-sulfonate. The complex was characterized by IH NMR, IR, elemental analysis and X-ray single-crystal diffraction studies. It crystallizes in triclinic, space group P]-. In the complex, the chelate atoms of Cd（II） are all from oxygen. Four Cd（II） are con- nected via the carbonyl and 5-hydroxyanion of four ligands and form an approximate square. Four ligands locate at two sides of the square, and two of them at the same side are almost parallel and exist aromatic n-n stacking. Ligands on the opposite side of the square are nearly perpendicular. The result of the luminescent studies indicated that the solid of the complex shwed photoluminescent properties because of a combination of coordination, hydro- gen bonding and n-n stacking interaction in the molecule structure. The complex emits green fluorescence （2em= 496 nrn） when it is excited at the wavelength of 440 nm.

Syntheses and Crystal Structures of Ternary Complexes of Zinc(Ⅱ) and Cadmium(Ⅱ) with 3-Aminobenzoic Acid and 1,10-Phenanthroline

Two new ternary complexes [Zη（3-aba）2（phen）]·2.58H2O 1 and {[Cd（3-aba）- （phen）2]·（NO3）·（1.5H2O） }n 2 （3-aba = 3-aminobenzoic acid anion, phen = 1,10-phenanthroline） were synthesized and characterized by elemental analysis, IR, UV spectrum and X-ray diffraction. Complex 1 crystallizes in the rhombohedral system, space group R3 with a = 3.5733（3）, b = 3.5733（3）, c = 1.1231（2） nm; V= 12.419（3） nm^3, C26H25.17NaO6.58Zn, Mr= 564.37, Z= 18, F（000） = 5253, μ= 0.937 mm^-1, Dc = 1.358 g/cm^3, R = 0.0668 and wR = 0.1690 for 2424 observed reflections （I〉 2σ（I））. Complex 2 belongs to the tetragonal system, space group P4/ncc with a = 2.88451（10）, b = 2.88451（10）, c = 1.55571（11） nm, V= 12.9441（11） nm^3, C31H25CdN6O6.50, Mr = 697.97, Z = 16, F（000） = 5648,μ=0.727 mm^-1, Dc= 1.433 g/cm^3, R = 0.0607 and wR = 0.1742 for 3468 observed reflections （I 〉 2σ（I））. Complex 1 displays a mononuclear structure. The carboxylate group of 3-aminobenzoic acid anion coordinates to Zn（Ⅱ） in a chelating bidentate mode, and the nitrogen atom of the ligand does not involve in coordination. Complex 2 exhibits a one-dimensional chain structure with 3-aminobenzoic acid anion coordinating to Cd（Ⅱ） in a μ2-bridging mode through its nitrogen atom and one of its oxygen atoms.

Synthesis and Crystal Structure of Cadmium(Ⅱ) Complex [Cd(H_2O)(CH_3OC_6H_4COO)_2]_n

At room temperature, the reaction of Cd(NO3)24H2O and anisic acid in an ethanol solution affords the cadmium (Ⅱ) complex [Cd(H2O)(CH3OC6H4COO)2]n. The crystal is of monoclinic, empirical formula C16H16O7Cd, Mr = 432.69, space group C2/c with parameters: a = 34.211(2), b = 6.030(2), c = 7.611(3) ? = 95.619(5)? V = 1562.5(9) ?, Z = 4, Dc = 1.831 g/cm3, = 1.434 mm-1, F(000) = 856, R = 0.0215 and wR = 0.0456. 1121 reflections with I ≥ 2s(I) were considered to be observed. Each cadmium atom is seven-coordinate in a distorted pentagonal bipyramidal geometry. The Cd (Ⅱ) center is doubly bridged with the neighboring Cd centers by anisate ligands to form a four-membered ring with a repeating unit of CdOCdO-. The extended structure and hydrogen-bonding patterns displayed in the complex were studied.

A novel pentaazadentate bismacrocyclic cadmium complex

A novel pentaazadentate bismacrocycle was synthesized through an improved procedure of 1:1 Schiff base condensation of diformyltripyrrane with 3, 4, 3', 4'-tetraamino-biphenyl hydrochloride using Pb2+ as template ion, in which the condensed byproduct water was removed efficiently to make the yield over 90%. Then the bismacrocyclic ligand reacted with cadmium chloride to Field the title metal complex with molecular weight being 1200.4 by TOF MS and the lambda(max) being 766 nm.

Synthesis and Structural Characterization of a New Cadmium(II) Complex with a Double Betaine

A new flexible double betaine L （L = 1,4-bis（pyridinio-4-carboxylato-N-methyl）benzene, C20H16N2O4） and its cadmium（Ⅱ） complex [Cd（H2O）aL（NO3）]NO3.H2O 1 were synthesized. Complex 1 was obtained by self-assembly reaction of [Cd（NO3）2]-4H2O and L in hot water,and its crystal structure was determined by single-crystal X-ray diffraction analysis. Crystallographic data for complex 1： C20H24CdN4O14.H2O, Mr = 674.85, monoclinic, space group P21/c, a =13.7854（3）, b = 14.2820（3）, c = 14.9188（4） ,A°, β = 116.418（1）°, V = 2630.5（1）A°^3, Z = 4, Dc= 1.704g/cm^3,/J（MoKα） = 0.911 mm^-1, F（000） = 1368, the final R = 0.0315 and wR = 0.0768 for 3637 observed reflections with I 〉 2σ（I）. In complex 1, L acts as a monodentate ligand to link a Cd（Ⅱ） ion in a novel coordination mode of double betaines. The mononuclear [Cd（H2O）aL（NO3）] units are connected through intermolecular hydrogen bonds and π-π stacking reactions to generate a 3D network.

Crystal Structure,Electrochemical and Fluorescent Properties of a New Cadmium(II) Complex[Cd(C_(12)H_6O_4N_2)(Phen)_2(H_2O)]·3H_2O

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.

Synthesis and Crystal Structure of a Seven-coordinate Cadmium(Ⅱ) Complex

The reaction of 4-hydroxybenzoic acid (H2L),4, 4-diaminodiphenylmethane (DADPM) and Cd(NO3)2?H2O in methane/water gave rise to a seven-coordinate Cd(Ⅱ) complex [Cd2(HL)4(H2O)6]?H2O which has been characterized by single-crystal X-ray diffraction. The complex crystallizes in the orthorhombic system, space group Pna21 with unit cell parameters: a = 10.3352(3), b = 12.0481(3), c = 28.2016(1) ? V = 3511.65(13) 3, Z = 4, C28H36Cd2O20, Mr = 917.37, Dc = 1.735 g/cm3, F(000) = 1840, (MoK? = 1.29mm-1. The final R and wR are 0.0536 and 0.1086 for 4898 observed reflections with I ≥ 4(I). The Cd(Ⅱ) is seven-coordinated in a distorted pentagonal bipyramidal geometry. The inter-molecular hydrogen bonds lead to the formation of a two-dimensional layer structure.

Syntheses, Structures and Photoluminescence of the Cadmium(Ⅱ) and Copper(Ⅱ) Complexes Based on 4'-(4''-Pyridyl)-2,2':6',2''-terpyridine and 1,4-Benzenedicarboxylic Acid Ligands

Two new metal-organic complexes [Cd2（1,4-BDC）（4-pytyp）（H2O）4]·（1,4-BDC）（1） and [Cu2（1,4-BDC）（4-pytyp）2（H2O）2]·（1,4-BDC）·8H2O（2）（4-pytyp = 4＇-（4＇＇-pyridyl）-2,2＇：6＇,2＇＇-terpyridine, 1,4-H2 BDC = 1,4-benzenedicarboxylic acid） have been synthesized under hydrothermal conditions and characterized by elemental analysis, infrared analysis and X-ray single-crystal diffraction. The scrutiny of single-crystal structure reveals that complex 1 forms to a 3D supramolecular network linked by π-π stacking interactions and hydrogen bonds. X-ray diffraction analysis reveals that complex 2 exhibits a 3D supramolecular network linked through complicated hydrogen bonds. The thermogravimetric analysis and photoluminescent properties of 1 and 2 are discussed in detail.