Synthesis, Crystal Structure and Quantum Chemical Investigation of Bis-Schiff Base Compounds Derived from2-phenyl-1,2,3-triazole-4-carboxaldehyde with Diamine

Two new schiff base N,N＇-bis（（2-phenyl-2H-1,2,3-triazol-4-yl）methylene）-1,3-propanediamine （1） and N,N＇-bis（（2-phenyl-2H-1,2,3-triazol-4-yl）methylene） -1,4-butanediamine （2） were synthesized by condensation of 2-phenyl-1,2,3-triazole-4-carboxaldehyde with diamine, and characterized by elemental analysis, IR, IH NMR and MS spectra. Their crystal structures were determined by X-ray single crystal diffraction. Both crystals belong to the monoclinic system, space group P21/c. For compound 1（C21H20N8, Mr=384.45）： a = 16.314（3）, b =5.7168（11）, c = 21.316（4） A, β = 105.3（2）°, Z = 4, V = 1917.6（7） A^3, De =1.332 g/cm^3, F（000） = 808,μ = 0.086 mm 1, R = 0.0533 and wR = 0.1460; for compound 2 （C22H22N8, Mr=398.48）： a = 8.6156（17）, b = 5.2964（11）, c = 22.665（5）A, β = 100.54（3）°, Z = 2, V = 1016.8（4） A^3, De= 1.302 g/cm^3, F （000） = 420, μ = 0.083 mm^-1, R = 0.0373 and wR = 0.1155. Based on the crystal data, quantum chemistry calculation was performed on the two title compounds by means of Gaussian 98 program. The molecular orbital energies and atomic net charges population were obtained. Furthermore, we antilyzed their active atoms. The investigation can serve as a theoretical guide to study the synthesis and activity of the title compounds.     

Syntheses and Crystal Structures of Four Cobalt Supramolecular Architectures with Hmtyaa Ligand

Four cobalt supramolecular architectures with Hmtyaa(2-(5-methyl-1,3,4-thiadiazol-2-ylthio)acetic acid) ligand have been synthesized.[Co(mtyaa)2(H2O)4]·4(H2O)(1):triclinic,space group P1 with a = 6.7537(18),b = 8.591(2),c = 10.615(3) ,α = 96.495(4),β = 99.955(5),γ = 103.615(5)°,V = 581.9(3) 3,Z = 1,Mr = 581.52,Dc = 1.659 g/m3,μ = 1.158 mm-1,F(000) = 301,Rint = 0.0557,R = 0.0377 and wR = 0.1056 for 1854 observed reflections with Ⅰ 2σ(Ⅰ);{[Co(4,4'-bipy)(H2O)4]·2(mtyaa)·2(H2O)}n(2):triclinic,space group P1 with a = 7.669(2),b = 8.840(3),c = 11.521(4) ,α = 79.912(5),β = 73.954(5),γ = 86.612(6)°,V = 738.9(4) 3,Z = 1,Mr = 701.67,Dc = 1.577 g/m3,μ = 0.924 mm-1,F(000) = 363,Rint = 0.0636,R = 0.0498 and wR = 0.1311 for 2155 observed reflections with Ⅰ 2σ(Ⅰ);{[Co(4,4'-bipy)(mtyaa)(H2O)3](mtyaa)·2(H2O)}(3):monoclinic,space group Pc with a = 7.7832(17),b = 11.527(3),c = 31.483(7) ,β = 91.952(4)°,V = 2822.9(11) 3,Z = 4,Mr = 683.65,Dc = 1.609 g/m3,μ = 0.963 mm-1,F(000) = 1412,Rint = 0.0758,R = 0.0609 and wR = 0.1095 for 5841 observed reflections with I 2σ(I);{[Co(bpe)(mtyaa)2(H2O)2]}n(4):monoclinic,space group C2/c with a = 19.290(11),b = 12.027(7),c = 14.865(8) ,β = 125.648(8)°,V = 2802(3)3,Z = 4,Mr = 657.66,Dc = 1.559 g/m3,μ = 0.959 mm-1,F(000) = 1356,Rint = 0.0456,R = 0.0332 and wR = 0.0985 for 2299 observed reflections with Ⅰ 2σ(Ⅰ).     

Ionothermal Syntheses and Crystal Structures of Two Cobalt（Ⅱ） Compounds：Co（2,2＇-bpy）_2Br_2 and Co（1,10-phen）_2Br_2

Two cobalt(Ⅱ) compounds,Co(2,2-bpy) 2 Br 2 (1,2,2-bpy=2,2-bipyridyl) and Co(1,10-phen) 2 Br 2 (2,1,10-phen=1,10-phenanthroline),have been prepared under ionothermal reactions using the 1-propyl-3-methylimidazolium bromide ionic liquid solvent.Single-crystal X-ray analyses reveal that 1 crystallizes in a monoclinic space group P2 1 /c,with a=8.5509(13),b=14.804(2),c=15.650(2),β=97.119(2) o,V=1965.8(5) 3,Z=4,C 20 H 16 Br 2 N 4 Co,M r=531.12,D c=1.795 g/cm 3,μ=4.950 mm-1,F(000)=1044,the final R=0.0467 and wR=0.0736 for 2291 observed reflections with I > 2σ(Ⅰ).Complex 2 crystallizes in a monoclinic space group P2 1 /n,with a=10.4237(8),b=16.8657(12),c=12.4945(9)b,β=102.110(1) o,V=2147.7(3) 3,Z=4,C 24 H 16 Br 2 N 4 Co,M r=579.16,D c=1.791 g/cm 3,μ=4.540 mm-1,F(000)=1140,the final R=0.0431 and wR=0.1042 for 3470 observed reflections with I > 2σ(Ⅰ).The mononuclear molecules of 1 are linked by the C-H···Br hydrogen bonds and π-π interactions to form a three-dimensional supramolecular framework structure.The C-H···Br hydrogen bonds and π-π interactions link the mononuclear molecules of 2 to give a two-dimensional layer structure.     

Molecular and Supramolecular Structures of Manganese(Ⅱ) and Cobalt(Ⅱ) Complexes with 1-Carboxymethylpyridinium-4-carboxylate

Two complexes with a zwitterionic dicarboxylate ligand,Mn(L)2(H2O)4 1 and Co(L)2(H2O)4 2(L = 1-carboxymethylpyridinium-4-carboxylate),were synthesized and structurally characterized.Complex 1 crystallizes in monoclinic,space group P21 with a = 6.490(2),b = 19.210(7),c = 7.813(3) ,β = 92.716(5)o,V = 972.9(6) 3,Z = 2,Mr = 487.28,Dc = 1.663 g/cm3,F(000) = 502,μ = 0.749 mm-1,S = 1.060,the final R = 0.0377 and wR = 0.0893 for 3292 observed reflections with I 2σ(I).Complex 2 is isomorphous with 1,with a = 6.478(2),b = 19.052(7),c = 7.742(3) ,β = 92.690(4)o,V = 954.6(6) 3,Z = 2,Mr = 491.28,Dc = 1.709 g/cm3,F(000) = 506,μ = 0.971 mm-1,S = 1.035,the final R = 0.0425 and wR = 0.0809 for 3289 observed reflections with I 2σ(I).In the compounds,the mononuclear [M(L)2(H2O)4] units with trans-octahedral coordination geometry are linked into 3D architectures via hydrogen bonding(or second-sphere coordination) involving carboxylate groups and coordinated water molecules.The 3D networks illustrate a 3,8-connected net with Schlfli symbol(4·62)2(42·623·83).     

Addition Reaction of Bis（diphenylphosphinyl） Butadiyne with Methylcyclopentadiene

Bis(diphenylphosphinyl)butadiyne reacted with methylcyclopentadiene at room tem- perature and four isomeric products were obtained. Crystal structures of isomers 1 and 3 have been determined. Crystal data for compound 1 C40H36O2P2·2CHCl3: monoclinic, space group C12/c1 with a = 17.983(2), b = 11.8723(12), c = 20.081(2) , β = 111.218(3)°, V = 3996.5(8) 3, Z = 4, Mr = 849.36, Dc = 1.412 g/cm3, F(000) = 1752, μ = 0.546 mm-1, the final R = 0.0351 and wR = 0.0951 for 3965 observed reflections (I > 2σ(I)); and those for compound 3 C40H36O2P2·H2O: triclinic, space group P1 with a = 10.4144(15), b = 13.0558(18), c = 13.742(2) , α = 70.453(8), β = 75.382(8), γ = 72.312(8)°, V = 1653.7(4) 3, Z = 2, Mr = 628.64, Dc = 1.262 g/cm3, F(000) = 664, μ = 0.169 mm-1, the final R = 0.0593 and wR = 0.1296 for 4891 observed reflections (I > 2σ(I)). The structures of the other two isomers are identified via IR, 1H NMR and MS spectra.     

Synthesis and Crystal Structure of 4-Bromo-5-ethoxy-3-methyl-5- （naphthalen- 1-yl）- 1-tosyl- 1H-pyrrol-2（5H）- one

The title compound 4-bromo-5-ethoxy-3-methyl-5-(naphthalen-1-yl)-1-tosyl-1H- pyrrol-2(5H)-one 1 (C24H22BrNO4S, Mr = 500.40) has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction analysis. It crystallizes in monoclinic, space group P21/n with a = 8.8562(15), b = 18.118(3), c = 14.055(2) , β = 99.855(3)o, V = 2221.9(6) 3, Z = 4, Dc = 1.496 g/cm3, μ = 1.975 mm-1, λ = 0.71073 , F(000) = 1024, R = 0.0607 and wR = 0.1371.     

Conformation Diversity of Complexes Constructed by N-（2-Pyridylmethyl）-phenylalanine and Zn（Ⅱ）

Four configurationally and conformationally related Zn（II） complexes with a tridentate ligand namely, N-（2-pyridylmethyl）-phenylalanine （Hpmpa）, have been synthesized by hydrothermal reactions. [Zn（L-α-pmpa）2·HaO] 1： orthorhombic, space group P21212 with a = 15.1091（7）, b = 16.2417（8）, c = 5.9972（3） A, V= 1471.70（12）A^3, Z = 2, Mr = 593.97, Dc = 1.340 g/cm^3,μ = 0.879 mm^-1, F（000） = 620, Rint= 0.0205, R = 0.0450 and wR = 0.1578 for 3102 observed reflections with I 〉 2σ（I）; [Zn（D-α-pmpa）2·2H2O] 2： orthorhombic, space group P21212 with a = 15.1023（6）, b = 16.2516（7）, c = 6.0024（2）A, V= 1473.21（10）A^3, Z = 2, Mr = 611.98, Dc = 1.380 g/cm^3,μ = 0.882 mm^-1, F（000） = 640, Rint= 0.0337, R = 0.0484 and wR = 0.1435 for 2408 observed reflections with I 〉 2σ（I）; [Zn（L-β-pmpa）2] 3： monoclinic, space group C2/c with a = 27.8667（5）, b = 5.60350（10）, c = 19.9636（2）A β = 120：2210（10）°, V = 2693.66（7）A^3, Z = 4, Mr = 575.95, De= 1.420 g/cm^3,μ = 0.955 mm^-1, F（000） = 1200, Rint= 0.0345, R = 0.0358 and wR = 0.1135 for 2251 observed reflections with I 〉 2σ（I）; and [Zn（D-β-pmpa）2] 4. They are all mononuclear discrete structures. The influence of temperature and pH on the conformation of structures has been investigated. Moreover, the photoluminescent properties of compounds 1 and 3 are also reported.     

Synthesis,Crystal Structure and Characterization of a Cobalt Coordination Polymer： [Co（1,4-ndc）（L） （H2O）]n

The title coordination polymer, [Co（1,4-ndc）（L）（H2O）]n 1 （1,4-H2ndc = 1,4-na- phthalenedicarboxylic acid and L =1-（5-（1H-imidazol- 1-yl）pentyl）- 1H-imidazole） has been hydrothermally synthesized and characterized by IR and single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21/n with a = 12.4333（12）, b = 13.2963（13）, c = 13.4678（13）A, α =β = 90°, y =107.302（2）°, V= 2125.7（4）A^3, Z = 4, CoC22H22N4O5, Mr = 481.37, De = 1.504 g/cm^3, F（000） = 996, μ（MoKa） = 0.850 mm^-1, R = 0.0472 and wR = 0.0984. Compound 1 exhibits a two-dimensional layer structure. The O-H...O and C-H...O hydrogen bonds stabilize the structure of 1.     

Syntheses and Crystal Structures of 3,5-Diiodo-salicylalidehyde and 3,5-Diiodo-salicylalidene-4-nitroaniline

The title compounds, C7H4I2O2 1 and C13H7I2N2O3 2, have been synthesized and characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in monoclinic, space group P21/c with a = 9.802（2）, b = 13.867（3）, c = 7.364（2） A, β = 109.74（3）°, V= 942.1（3） A^3, Dc= 2.636 g/cm^3, C7H4I2O2, Mr= 373.90, F（000） = 672, μ = 6.627 mm^-1, Z = 4, R = 0.0459 and wR = 0.1018 for 1805 observed reflections （I 〉 2 σ（I））. Compound 2 belongs to the monoclinic system, space group P21/n with a = 9.015（2）, b = 12.024（2）, c = 14.072（3） A, β = 103.91（3）°, V = 1480.6（5） A^3, Dc= 2.216 g/cm^3, C13H7I2N2O3, Mr= 494.01, F（000） = 920, p = 4.255 mm^-1, Z = 4, R = 0.0777 and wR = 0.1757 for 2896 observed reflections （I 〉 2σ（I））. Compounds 1 and 2 were assayed for antibacterial activities against three Gram positive bacterial strains （B. subtilis, S. aureus and S. faecalis） and three Gram negative bacterial strains （E. coli, P. aeruginosa and E. cloacae） by MTr method. Fortunately, compound 2 is found to show potent antibacterial activity against these six bacterial strains.     

2(S),3(R)-二羟基甲基-N-环己基氮杂环丙烷的合成及其晶体结构

合成了5-(R)-(1R,2S,5R)-孟氧基丁内酯并[3,4-b]-2(S)-6(R)-1-N-环己基氮杂环丙烷(3)和2(S),3(R)-二羟基甲基-N-环己基氮杂环丙烷(4),其晶体结构经四圆单晶X-射线衍射仪测定。3属三斜晶系,p1空间群,a=5.438(11),b=8.117(2),c=11.572(2),Mr=335.47,α=96.84(3)°,β=94.48(3)°,γ=101.86(3)°,V=493.5(2)3,Z=1,Dc=1.129g·cm-3,μ=0.074mm-1,F(000)=184,R=0.086,wR=0.2344,1527个独立衍射点。4属单斜晶系,P2(1)/n空间群,a=8.0915(15),b=7.2055(13),c=18.6120(3),Mr=185.26,β=102.086(2)°,V=1061.1(3)3,Z=4,Dc=1.160g·cm-3,μ=0.080mm-1,F(000)=408,R=0.0466,wR=0.1224,1485个独立衍射点。4分子中存在两种分子间氢键。     

Syntheses and Crystal Structures of Two One-dimensional Coordination Polymers Constructed from a Flexible Hinge-like Ligand

By using the flexible hinge-like ligand 2,2＇-bis（3-hydroxy-l,4-naphthoquinone） （H2bhnq）, two isomorphous one-dimensional zigzag chain coordination polymers have been obtained. Single-crystal X-ray analyses revealed that the metal centers in these two complexes are distorted octahedra involving four oxygen atoms of two bhnq2 anions, and two oxygen atoms of two DMF molecules situated in trans positions to one another. Crystal data for [Mn（bhnq）（DMF）2]n 1： C26H22MnN2O8, Mr = 545.40, monoclinic, space group C2/c, a = 14.936（3）, b = 10.362（2）, c = 15.901（3）A., β = 99.86（3）°, V = 2424.7（8）A3, Z = 4, Dc = 1.494 g/cm^3, F（000） = 1124,μ = 0.599 mm^-1, final GOOF = 1.025, R = 0.0654 and wR = 0.1537. Crystal data for [Cd（bhnq）（DMF）2]n 2： C26H22CdN2O8, Mr = 602.86, monoclinic, space group C2/c, a = 14.839（3）, b = 10.493（2）, c = 16.034（3）A, β = 99.40（3）°, V = 2463.1（9）A^3, Z = 4, Dc = 1.626 g/cm^3, F（000） = 1216,μ = 0.941 mm^-1, final GOOF = 1.069, R = 0.0358 and wR = 0.0944.     

Hydrothermal Synthesis and Crystal Structure of a Copper Complex

The title compound [Cu(IB)2]n·n(H2O) 1 was synthesized via the hydrothermal reaction of CuSO4·5H2O and NaOH with 4-(1H-Imidazol-1-yl)benzoic acid(HIB),and character-rized by elemental analysis and infrared spectra.The crystal of 1 crystallizes in monoclinic,space group C2/c with a = 14.349(7),b = 5.977(3),c = 21.368(9) ,β = 104.956(9)o,V = 1770.5(2)3,Z = 4,C20H16CuN4O5,Mr = 455.92,Dc = 1.710 g/cm3,F(000) = 932 and μ(MoKα) = 1.279 mm-1.The final R = 0.0337 and wR = 0.0888 for 1972 observed reflections with Ⅰ 2σ(Ⅰ) and R = 0.0369 and wR = 0.0926 for all data.X-ray diffraction reveals that the IB ligand links the Cu(Ⅱ) atoms into a double stranded chain.The extensive supramolecular interactions lead to the formation of an infinite 2D structure.     

Synthesis, Crystal Structure and Antitumor Activity of （E）-4-tert-Butyl-N-（2,4-dichlorobenzylidene）-5-（1,2,4-triazol-1-yl）-thiazol-2-amine

The title compound (E)-4-tert-butyl-N-(2,4-dichlorobenzylidene)-5-(1,2,4-triazol-1-yl)-thiazol-2-amine was synthesized by the reaction of 4-tert-butyl-5-(1,2,4-triazol-1-yl)-thiazol-2-amine with 2,4-dichlorobenzaldehyde, and its crystal structure was determined by singlecrystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1 with a = 7.9748(4), b = 10.1803(5), c = 11.4603(6), α = 102.882(1), β = 100.253(1), γ = 104.457(1)°, V = 850.95(7)3, Z = 2, F(000) = 392, C16H15Cl2N5S, Mr = 380.29, Dc = 1.484 g/cm3, S = 1.095, μ = 0.512 mm-1, the final R = 0.0301 and wR = 0.0965 for 3334 observed reflections (I 2σ(I)). The preliminary antitumor activity shows that for the title compound the IC50 of Hela is 0.175 μmol/mL and that of Bel7402 is 0.156 μmol/mL.     

Syntheses and Crystal Structures of Two 3D Zinc(II) Compounds Involving Coordination and Hydrogen Bonds

1 INTRODUCTION Self-assembly through coordination and hydrogen bonds has been proved to be a powerful tool for con- structing functional organic crystalline materials[1~4]. Except for the important role of H-bonds in the sta- bilization of structures, hydrogen bonding groups namely hydroxyl, amide groups in adjacent coor- dination polymeric chains or discrete lamellas can form hydrogen bonds, which allow for the assembly of well-formed crystalline solid[5, 6]. Our recent inte- rest is foc…     

Syntheses and Crystal Structures of Two Co(II) Coordination Polymers with 4,4'-(Hexafluoroisopropylidene)bis(benzoic acid)

Two new one-dimensional zigzag chain coordination polymers,[Co(hfipbb)(2,2'-bpy)(H2O)2]n 1 and [Co(hfipbb)(1,10-phen)(H2O)]n 2,have been synthesized under hydrother-mal reactions from CoCl2.6H2O,4,4'-(hexafluoroisopropylidene)bis(benzoic acid) and 2,2' -bipyridine or 1,10-phenanthroline ligands,respectively. Single-crystal X-ray analyses revealed that the zigzag chains of 1 and 2 are linked into three-dimensional supramolecular networks by both O-H···O hydrogen-bonds and π···π stacking interactions. Crystal data for 1:C27H20CoF6N2O6,Mr=641.38,orthorhombic,space group Pnna,a=9.3820(19),b=27.366(6),c=10.106(2) ,V=2594.8(9) 3,Z=4,Dc=1.642 g/cm3,F(000)=1300,μ=0.752 mm-1,R=0.0311 and wR=0.0924. Crystal data for 2:C29H18CoF6N2O5,Mr=647.38,monoclinic,space group P21/n,a=7.7626(16),b=29.446(6),c=11.281(2) ,β=93.98(3)°,V=2572.3(9) 3,Z=4,Dc=1.672 g/cm3,F(000)=1308,μ=0.757 mm-1,R=0.0403 and wR=0.0820.     

From Chain to Layer Structure: ZnⅡ Coordination Polymers Derived from Diphenic Acid

Three ZnⅡ coordination polymers, [Zn(py)(H2O)(dpa)]n 1, [Zn2(4,4'-bipy)2(dpa)2]n 2 and [Zn(bpe)(H2O)2(Hdpa)2]n 3 (py = pyridine, H2dpa = diphenic acid, 4,4'-bipy = 4,4'-bipyridine,bpe = 1,2-bis(4-pyridyl)ethane), were synthesized and characterized by X-ray single-crystal structure determination. 1 crystallizes in monoclinic, space group C2/c with a = 23.014(3), b = 8.7184(13), c = 18.091(3) (A), β = 95.964(3)°, V = 3610.2(9) (A)3, Z = 8, C19H15NO5Zn, Mr = 402.69,Dc= 1.482 g/cm3, F(000) = 1648, μ(MoKα) = 1.389 mm-1, the final R = 0.0431 and wR = 0.1120 for 4239 observed reflections with I ＞ 2σ(Ⅰ). 2 crystallizes in orthorhombic, space group Fddd with a = 23.1613(5), b = 24.0324(6), c = 29.4785(1) (A), V= 16408.4(5) (A)3, Z = 32, C24H16N2O4Zn, Mr = 461.76, Dc= 1.495 g/cm3, F(000) = 7552, μ(MoKα) = 1.232 mm-1, the final R = 0.0542 and wR = 0.1724 for 3632 observed reflections with I ＞ 2σ(Ⅰ). 3 crystallizes in orthorhombic, space group C2/c with a = 19.142(4), b = 13.862(3), c = 15.625(3) (A), β = 122.404(3)°, V = 3500.3(11) (A)3, Z = 8,C20H17NO5Zn0.50, Mr = 384.03, Dc= 1.457 g/cm3, F(000) = 1592,μ(MoKα) = 0.766 mm-1, the final R = 0.0400 and wR = 0.1210 for 4024 observed reflections with I ＞ 2σ(Ⅰ).     

Syntheses and Crystal Structures of Two Novel Cobalt(Ⅱ) Complexes with 2-Amino-5-substituted-1,3,4-thiadiazole as Ligands

Two novel cobalt(Ⅱ) compounds were obtained and characterized by X-ray single-crystal diffraction,IR,1H NMR and elemental analysis.Compound 1 crystallizes in monoclinic,space group P21/n,with a = 18.046(4),b = 11.335(3),c = 19.157(5) ,β = 92.707(3)o,Z = 4,V = 3914.4(16) 3,Mr = 968.56,Dc = 1.644 g/cm3,μ = 1.378 mm-1,F(000) = 1960,the final R = 0.0367 and wR = 0.0895.The crystal of compound 2 is of monoclinic,space group P21/c with a = 8.7253(10),b = 10.9031(13),c = 18.235(2) ,β = 93.2210(10)o,Z = 4,V = 1732.0(3) 3,Mr = 464.21,Dc = 1.780 g/cm3,μ = 1.560 mm-1,F(000) = 932,the final R = 0.0322 and wR = 0.0743.     

A Stable 'Three-in-one'Coordination Polymer

The title compound[Cu2(IB)2(HIB)2]1 was synthesized via the hydrothermal reaction of CuSO4·5H2O and NaOH with 4-(1H-Imidazol-1-yl)benzoic acid(HIB),and characte-rized by elemental analysis and infrared spectra.The crystal of 1 crystallizes in monoclinic,space group C2/c with a=24.513(8),b=18.948(5),c=17.248(6)(A),β=119.81(2)°,V=6951(4)(A)3,Z=8,C40H30Cu2N8O8,Mr=877.80,Dc=1.678 g/cm3,F(000)=3584 and μ(MoKa)=1.295 mm-1.The final R=0.0542 and wR=0.1335 for 5398 observed reflections with I>2σ(I)and R=0.0845 and wR=0.1520 for all data.X-ray diffraction analysis reveals that the title complex is a unique 'three-in-one'crystal of coordination network through strong hydrogen bonds and coordination covalent bonds.The thermogravimetric analysis measurement showed that compound 1 has thermal stability as no strictly clean weight loss step occurs below 300℃.     

Synthesis and Crystal Structure of a New cis-Dioxovanadium （V） Complex with Pyruvic Acid Isonicotinyl Hydrazone （PAINH）

1 INTRODUCTION The interest in vanadium chemistry from a biolo-gical and pharmacological perspective has explodedover the past 20 years. This is mainly based on thediscoveries of the insulin-like effect of vanadium compounds[1, 2], and the presence of vanadium in certainhaloperoxidases and nitrogenases[3, 4]. Vanadium complexes with organic ligands mightbe candidates for therapy of diabetes, consequentlydesign and synthesis of new complexes are of greatinterest recently[5, 6]. On consid…     

Synthesis and Crystal Structure of a New Complex Zn(Ⅱ)L_2·2CH_3OH(H_2L = 4-Chloro-2-(2,3-dihydro-1H-benzoimidazol-2-yl)-phenol)

A new complex Zn(Ⅱ)L2·2CH3OH(H2L = 4-chloro-2-(2,3-dihydro-1H-ben-zoimi-dazol-2-yl)-phenol) has been prepared and characterized by single-crystal X-ray diffraction analysis and elemental analysis.The crystal is of triclinic system,space group P1 with a = 9.2905(10),b = 10.3555(13),c = 14.9590(14) ,α = 101.0340(10),β = 101.261(2),γ = 99.1660(10)o,V = 1356.1(3) 3,Z = 2,C28H24Cl2N4O4Zn,Mr = 616.78,Dc = 1.510 g/cm3,μ = 1.145 mm·1,F(000) = 632,the final R = 0.0379 and wR = 0.0830 for 3606 observed reflections with I 2σ(I).The Zn(Ⅱ) atom presents a distorted square pyramidal coordination involving two H2L ligands.The hydrogen bonds and π···π stacking interactions extend the complex into a two-dimensional framework.