Synthesis and Crystal Structure of Diaquabis{2,4- dibromo-6-[（2-ethylaminoethylimino）methyl]- phenolato}nickel（II） Dinitrate Diacetonitrile

The title mononuclear Schiff base nickel(Ⅱ) complex [Ni(C11H14Br2N2O)2(H2O)2]·2NO3·2C2H3N was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group P21/n with a = 15.534(2), b = 7.647(1), c = 16.435(2) (A), β = 103.252(2)o, V = 1900.3(4) (A)3, Z = 2, Dc = 1.750 g/cm3, Mr = 1000.99, λ(MoKα) = 0.71073 (A), μ = 4.776 mm-1, F(000) = 996, the final R = 0.0368 and wR = 0.0724. A total of 3988 unique reflections were collected, of which 2764 with I＞2σ(I) were observed. The complex consists of a mononuclear [Ni(C11H14Br2N2O)2(H2O)2]2 cation, two nitrate anions and two acetonitrile molecules. The Ni atom, lying on the inversion centre, is six- coordinated by two Schiff bases and two water molecules to assume an octahedral coordination geometry. The molecules in the crystal are linked through intermolecular hydrogen bonds of N-H…O, N-H…Br, O-H…O, O-H…N and C-H…O to form layers.     

Synthesis and Crystal Structure of Diaquabis{2,4-dibromo-6-[(2-ethylaminoethylimino)methyl]-phenolato}nickel(Ⅱ) Dinitrate Diacetonitrile

The title mononuclear Schiff base nickel(Ⅱ) complex [Ni(C11H14Br2N2O)2(H2O)2]· 2NO3·2C2H3N was prepared and characterized by elemental analysis,IR spectrum,and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system,space group P21/n with a=15.534(2),b=7.647(1),c=16.435(2),β=103.252(2)o,V=1900.3(4)3,Z=2,Dc=1.750 g/cm3,Mr=1000.99,λ(MoKα)=0.71073,μ=4.776 mm-1,F(000)=996,the final R=0.0368 and wR=0.0724. A total of 3988 unique reflections were collected,of which 2764 with I > 2σ(I) were observed. The complex consists of a mononuclear [Ni(C11H14Br2N2O)2(H2O)2]2+ cation,two nitrate anions and two acetonitrile molecules. The Ni atom,lying on the inversion centre,is six-coordinated by two Schiff bases and two water molecules to assume an octahedral coordination geometry. The molecules in the crystal are linked through intermolecular hydrogen bonds of N–H…O,N–H…Br,O–H…O,O–H…N and C–H…O to form layers.     

Synthesis and Crystal Structure of Bis{2-bromo- 4-chloro-6-[(2-isopropylammonioethylimino)-methyl]phenolato}bisthiocyanatozinc(Ⅱ)

A Schiff base zinc(Ⅱ) complex [Zn(C12H16BrClN2O)2(NCS)2] was prepared and characterized by elemental analysis, IR and single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P with a = 8.414(1), b = 9.124(1), c = 22.212(3) (A), α = 79.177(2), β = 86.296(2), γ = 89.899(2)o, V = 1671.3(4) (A)3, Z = 2, Dc = 1.631 g/cm3, Mr = 820.79, λ(MoKα) = 0.71073 (A), μ = 3.444 mm-1, F(000) = 824, R = 0.0646 and wR = 0.1179. A total of 7371 unique reflections were collected, of which 3904 with I＞2σ(I) were observed. The complex crystallizes with two half-molecules per asymmetric unit and each mononuclear molecule is centrosymmetric. The Zn atom lying at the inversion centre is six-coordinated in a slightly distorted octahedral geometry by two phenolate O atoms and two imine N atoms from two Schiff base ligands, as well as two N atoms from two thiocyanate anions. In the crystal structure, the combination of π-π stacking interactions and intermolecular hydrogen bonds (N-H…Br, N-H…O, N-H…N, C-H…O, C-H…S and C-H…Cl) leads to a three-dimensional network.     

Synthesis and Crystal Structure of a Three-dimensional Manganese(Ⅱ)Complex (tataH)2[Mn(pydc)2]·4H2O(tata= 2,4,6-Triamino-1,3,4,-triazine,pydcH2= Pyridine-2,6-dicarboxylic Acid)

A manganese(Ⅱ) complex (tataH)2[Mn(pydc)2]·4H2O (C20H28MnN14O12, Mr = 711.50, tata = 2,4,6-triamino-1,3,5-triazine, pydcH2 = pyridine-2,6-dicarboxylic acid) has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1, with a = 9.9847(3), b = 10.9813(3), c = 15.2616(5) (A), α =101.5310(10), β = 90.2610(10), γ = 116.4600(10)°, V = 1459.44(8) A3, Z = 2, Dc = 1.619 g/cm3, μ = 0.539 mm-1, F(000) = 734, the final R = 0.0292 and wR = 0.0745. In the crystal the MnⅡ atom is six-coordinated by four carbonyl oxygen atoms and two pyridine nitrogen atoms from two tridentate H-bonded tetramer. The molecules are packed in a three-dimensional framework structure by the combination of O-H…O,N-H…O and N-H…N hydrogen bonds between (tataH) ,[Mn(pydc)2]2- and crystal water.     

Synthesis and Crystal Structure of Bis{2-bromo- 4-chloro-6-[（2-isopropylammonioethylimino）- methyl]phenolato}bisthiocyanatozinc（Ⅱ）

A Schiff base zinc(Ⅱ) complex [Zn(C12H16BrClN2O)2(NCS)2] was prepared and characterized by elemental analysis,IR and single-crystal X-ray diffraction. The crystal belongs to the triclinic system,space group P1 with a=8.414(1),b=9.124(1),c=22.212(3),α=79.177(2),β=86.296(2),γ=89.899(2)o,V=1671.3(4)3,Z=2,Dc=1.631 g/cm3,Mr=820.79,λ(MoKα)= 0.71073,μ=3.444 mm-1,F(000)=824,R=0.0646 and wR=0.1179. A total of 7371 unique reflections were collected,of which 3904 with I > 2σ(I) were observed. The complex crystallizes with two half-molecules per asymmetric unit and each mononuclear molecule is centrosymmetric. The Zn atom lying at the inversion centre is six-coordinated in a slightly distorted octahedral geometry by two phenolate O atoms and two imine N atoms from two Schiff base ligands,as well as two N atoms from two thiocyanate anions. In the crystal structure,the combination of π-π stacking interactions and intermolecular hydrogen bonds (N–H…Br,N–H…O,N–H…N,C–H…O,C–H…S and C–H…Cl) leads to a three-dimensional network.     

Synthesis and Structure of Dibenzoyl-bissemicarbazone Neodymium(Ⅲ) Perchlorate

A new Schiff base Dibenzoyl-bissemicarbazone C15H16N6O2(L) and its complex with neodymium(Ⅲ ) perchlorate [NdL2(H2O)2](ClO4)3 were synthesized. The crystal and molecular structure of the title complex were determined by single crystal X-ray diffraction. The crystal is monoclinic and conforms to space group P. with cell constants a=10. 893(2) A, b= 12. 118(3) A , c=22. 494(5) A , β=89. 86(3)% V = 2969.19A3. The final standard deviation R=0. 0919. In the complex Nd is coordinated by four nitrogen and six oxygen atoms, of which four nitrogen and four oxygen atoms are provided by two neutral ligands L, and the other two oxygen atoms are provided by two water molecules, forming a ten-coordinated complex cation, which the perchlorate groups exist in the outer sphere. The coordination polyhedron takes a bicapped anti-square prism arrangement. That the average bond length of Nd-N is 2. 735 A indicates that the coordination of N in groups to Nd( Ⅲ ) is very weak.     

Synthesis and Crystal Structure of a Three-dimensional Manganese（Ⅱ） Complex （tataH）2[Mn（pydc）2]·4H2O （tata = 2,4,6-Trlamino-1,3,5-trlazine,pydcH2 =Pyridine-2,6-dicarboxylic Acid）

A manganese（Ⅱ） complex （tataH）2[Mn（pydc）2]·4H2O （C20H28MBN14O12, Mr = 711.50, tata = 2,4,6-triamino-1,3,5-triazine, pydcH2 = pyridine-2,6-dicarboxylic acid） has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1^-, with a = 9.9847（3）, b = 10.9813（3）, c = 15.2616（5）A, a = 101.5310（10）, β = 90.2610（10）, γ = 116.4600（ 10）% V = 1459.44（8）A^3, Z = 2, Dc = 1.619 g/cm^3,μ = 0.539 mm^-1, F（000） = 734, the final R = 0.0292 and wR = 0.0745. In the crystal the Mnn atom is six-coordinated by four carbonyl oxygen atoms and two pyridine nitrogen atoms from two tridentate pydc ligands to furnish a distorted octahedral geometry. The complex shows the A…D…D＇…A＇ H-bonded tetramer. The molecules are packed in a three-dimensional framework structure by the combination of O-H…O, N-H…O and N-H…N hydrogen bonds between （tataH）^＋, [Mn（pydc）2]^2- and crystal water.     

Synthesis,Crystal Structure,and Cytotoxic Property of Dibromobis{4-bromo-2-[(2-phenylaminoethylimino)methyl]phenolato}dizinc(Ⅱ)

The title phenolic oxygen bridged dinuclear Schiff base zinc(Ⅱ)complex [Zn2Br2-(C15H14BrN2O)2]was synthesized and characterized by elemental analysis and single-crystal X-ray diffraction.The crystal belongs to the trielinic system,space group P-1 with a=9.2279(17),b=12.096(2),c=16.286(3)(A),α=75.402(3),β=87.464(3),γ=72.746(3)°,V=1679.1(5)(A)3,Z=2,Dc=1.833 g/cm3,Mr=926.94,λ(MoKα)=0.71073(A),μ=6.221 mm-1,F(000)=904,the final R=0.0601 and wR=0.1155.A total of 7453 unique reflections were collected,of which 3425 with Ⅰ＞2σ(Ⅰ)were observed.One Zn atom is six-coordinate in an octahedral geometry,and the other one is four-coordinate in atetrahedral geometry.The Zn…Zn distance is 3.106(2) (A).In the crystal structure,molecules are linked through intermolecular hydrogen bonds typed N-H…Br and C-H…Br,forming zigzag chains running along the b axis.The complex shows potent cytotoxic property to both normal and cardnoma cells.     

Synthesis, Crystal Structure and Electrochemistry Properties of a (N,N'-Ethylene-bis(salicylaldiminato)) Nickel(Ⅱ) Complex, [Ni2(salen)2]·NCS-NH4

A new Ni(Ⅱ) complex [Ni2(salen)2]·(NCS)·NH4 (salen = N,N'-bis(salicylidenea-mino)ethanato) has been prepared and structurally characterized by elemental analysis, IR spectra and single crystal X-ray diffraction. It crystallizes in the orthorhombic system, space group Pbca with a = 16.8725(13), b = 19.0046(15), c = 20.0583(16) (A), Z = 8, V = 6431.8(9) (A)3, C33H32N6Ni2O4S1, Mr= 726.13, Dc = 1.500 g/cm3, F(000) = 3008, μ = 1.284 mm-1, the final R = 0.0394 and wR = 0.0767 for 4449 observed reflections with Ⅰ＞2σ(Ⅰ). The complex involves a N,N'-ethylene-bis(salicylaldiminato) Schiff base, an isothiocyanato anion and an ammonium cation. The nickle(Ⅱ) ion adopts a distorted square coordination geometry with N2O2 set of Schiff base ligand. The complexes are linked into a dimmer via intermolecular hydrogen bonds and the [Ni(salen)] moieties are connected together to form a 2-D layer structure by intermolecular N-H…O hydrogen bonds and π-π stacking. Cyclic-voltammetry method was used to characterize electrochemically the complex.     

Synthesis and Crystal Structure of a Three-dimensional Manganese(II) Complex (tataH)_2[Mn(pydc)_2]·4H_2O (tata = 2,4,6-Triamino-1,3,5-triazine, pydcH_2 = Pyridine-2,6-dicarboxylic Acid)

A manganese(II) complex (tataH)2[Mn(pydc)2]·4H2O (C20H28MnN14O12, Mr = 711.50, tata = 2,4,6-triamino-1,3,5-triazine, pydcH2 = pyridine-2,6-dicarboxylic acid) has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1, with a = 9.9847(3), b = 10.9813(3), c = 15.2616(5) , α = 101.5310(10), β = 90.2610(10), γ = 116.4600(10)°, V = 1459.44(8) 3, Z = 2, Dc = 1.619 g/cm3, μ = 0.539 mm–1, F(000) = 734, the final R = 0.0292 and wR = 0.0745. In the crystal the MnII atom is six-coordinated by four carbonyl oxygen atoms and two pyridine nitrogen atoms from two tridentate pydc ligands to furnish a distorted octahedral geometry. The complex shows the A…D…D’…A’ H-bonded tetramer. The molecules are packed in a three-dimensional framework structure by the combination of O–H…O, N–H…O and N–H…N hydrogen bonds between (tataH)+, [Mn(pydc)2]2– and crystal water.     

Syntheses,Crystal Structures,and Antimicrobial Activities of N′-(5-Hydroxy-2-nitrobenzylidene)-4-dimethylaminobenzohydrazide Methanol Solvate and 2-Fluoro-N′-(5-hydroxy-2-nitrobenzylidene)benzohydrazide

Two new hydrazone compounds,N'-(5-hydroxy-2-nitrobenzylidene)-4-dimethyl-aminobenzohydrazide methanol solvate (1) and 2-fluoro-N'-(5-hydroxy-2-nitrobenzylidene)benzo-hydrazide (2),have been synthesized and characterized by elemental analysis,IR spectra,1H NMR,and single-crystal X-ray diffraction.Compound 1 crystallizes in the monoclinic space group P21/c with a=11.571(3),b=12.420(3),c=12.360(2) ?,β=97.495(2)°,V=1761.1(7) 3,Z=4,R=0.0735 and wR=0.1344.Compound 2 crystallizes in the triclinic space group P with a=7.551(3),b=8.254(3),c=11.365(2) ?,α=79.352(2),β=76.154(2),γ=71.624(2)°,V=648.2(4) 3,Z=2,R=0.0393 and wR=0.1008.The hydrazone molecules of the compounds display E configurations with respect to the C=N double bonds.In the crystal structure of 1,the hydrazone molecules are linked by methanol molecules through N-H…O,O-H…N and O-H…O hydrogen bonds,forming chains running along the c axis.In the crystal structure of 2,molecules are linked through N-H…O and O-H…O hydrogen bonds,forming ribbons running along the b axis.The preliminary antimicrobial activities were studied.     

Synthesis, Crystal Structure, and Cytotoxic Property of Di（μ1”,1”-azide）bis（4-nitro-2-（3＇-dimethylaminon-propylimino）methylenephenolate）dizinc（Ⅱ）

The title azide-bridged dinuclear Schiff base zinc(Ⅱ) complex [Zn2(C12H16N3O3)2-(μ1,1-N3)2] was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group F21/n with a = 8.736(2), b = 14.850(3), c = 11.775(2) (A), β = 102.42(3)°, V= 1491.8(5) (A)3, Z= 2, Dc = 1.593 g/cm3, Mr = 715.36, λ(MoKα) = 0.71073 (A), μ = 1.669 mm-1, F(000) = 736, the final R = 0.0338 and wR = 0.0789. A total of 3411 unique reflections were collected, of which 2777 with Ⅰ＞2σ(Ⅰ) were observed. The molecule of the complex is located on a crystallographic inversion centre. Each Zn atom in the complex is five-coordinated by one Schiff base ligand and two bridging azide groups, forming a trigonal bipyramidal configuration. The Zn…Zn distance is 3.328(2) (A). In the crystal structure, molecules are linked through intermolecular C-H…N hydrogen bonds, forming layers parallel to the bc plane. The complex shows low cytotoxic property to both normal and carcinoma cells.     

Synthesis, Crystal Structure, and Cytotoxic Property of Di(μ1",1"-azide)bis(4-nitro-2-(3 ''-dimethylamino-n-propylimino)methylenephenolate)dizinc(Ⅱ)

The title azide-bridged dinuclear Schiff base zinc(Ⅱ) complex [Zn2(C12H16N3O3)2-(μ1,1-N3)2] was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group F21/n with a = 8.736(2), b = 14.850(3), c = 11.775(2) (A), β = 102.42(3)°, V= 1491.8(5) (A)3, Z= 2, Dc = 1.593 g/cm3, Mr = 715.36, λ(MoKα) = 0.71073 (A), μ = 1.669 mm-1, F(000) = 736, the final R = 0.0338 and wR = 0.0789. A total of 3411 unique reflections were collected, of which 2777 with Ⅰ＞2σ(Ⅰ) were observed. The molecule of the complex is located on a crystallographic inversion centre. Each Zn atom in the complex is five-coordinated by one Schiff base ligand and two bridging azide groups, forming a trigonal bipyramidal configuration. The Zn…Zn distance is 3.328(2) (A). In the crystal structure, molecules are linked through intermolecular C-H…N hydrogen bonds, forming layers parallel to the bc plane. The complex shows low cytotoxic property to both normal and carcinoma cells.     

Synthesis and Crystal Structure of Di-μ1,1-azido-bis((azido)[N-ethyl-N''-(1-pyridin-2-ylmethylidene)ethane-1,2-diamino]cadmium(Ⅱ))

The dinuclear Schiff base cadmium(Ⅱ) complex [Cd2(C10H15N3)2(N3)2 (μ1,1-N3)2] was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray dif- fraction. The crystal belongs to the monoclinic system, space group P21/n with a = 10.819(2), b = 11.058(2), c = 12.766(3)(A), β = 102.456(2)°, V = 1491.3(7)(A)3, Z = 2, Dc = 1.665 g/cm3, Mr = 747.42, λ(MoKα) = 0.71073 (A), μ = 1.470 mm-1, F(000) = 744, R = 0.0307 and wR = 0.0584. A total of 3420 unique reflections were collected, of which 2575 with Ⅰ ＞ 2σ(Ⅰ) were observed. There is a crystallographic inversion centre at the midpoint of the two metal atoms in the complex. Each CdⅡ atom in the complex is in a distorted octahedral coordination. The molecules in the crystal are linked through the intermolecular hydrogen bonds of N-H…N and C-H…N, forming a three- dimensional network.     

Synthesis, Crystal Structure and Electrochemistry Properties of a (N,N''-Ethylene-bis(salicylaldiminato)) Nickel(Ⅱ) Complex, [Ni2(salen)2]·NCS-NH4

A new Ni(Ⅱ) complex [Ni2(salen)2]·(NCS)·NH4 (salen = N,N'-bis(salicylidenea-mino)ethanato) has been prepared and structurally characterized by elemental analysis, IR spectra and single crystal X-ray diffraction. It crystallizes in the orthorhombic system, space group Pbca with a = 16.8725(13), b = 19.0046(15), c = 20.0583(16) (A), Z = 8, V = 6431.8(9) (A)3, C33H32N6Ni2O4S1, Mr= 726.13, Dc = 1.500 g/cm3, F(000) = 3008, μ = 1.284 mm-1, the final R = 0.0394 and wR = 0.0767 for 4449 observed reflections with Ⅰ＞2σ(Ⅰ). The complex involves a N,N'-ethylene-bis(salicylaldiminato) Schiff base, an isothiocyanato anion and an ammonium cation. The nickle(Ⅱ) ion adopts a distorted square coordination geometry with N2O2 set of Schiff base ligand. The complexes are linked into a dimmer via intermolecular hydrogen bonds and the [Ni(salen)] moieties are connected together to form a 2-D layer structure by intermolecular N-H…O hydrogen bonds and π-π stacking. Cyclic-voltammetry method was used to characterize electrochemically the complex.     

Three-dimensional supramolecular architecture based on 4,4’-methylene-bis(benzenamine) and aromatic carboxylic acid guests:Synthons cooperation,robust motifs and structural diversity

The two-component solid forms involving 4,4’-methylene-bis(benzenamine) included both salts and co-crystals,while 4,4’methylene-bis(benzenamine) crystallized exclusively as a salt,in agreement with the differences in the pK a values.Many of the crystal structures displayed either the neutral or the ionic form of the carboxylic acid-amino heterosynthon,and the similarity in crystal structures between the neutral and the ionized molecules makes the visual distinction between a salt and co-crystal dependent on the experimental location of the acidic proton.A variety of supramolecular hydrogen bonded motifs involving interactions between the aza molecules and carboxylic acid groups are observed rather than just the O-H···N/O-H···O motif.The motifs are identical in all the two compounds analyzed showing the robustness of these supramolecular synthons.In all adducts,recognition between the constituents is established through either N-H···O and/or O-H···O/O-H···N pairwise hydrogen bonds.In all adducts,COOH functional groups available on 1 and 2 interact with the N-donor compounds.The COOH moieties in 1 forms only single N-H···O hydrogen bonds,whereas in 2,it forms pairwise O-H···N/N-H···O hydrogen bonds.The supramolecular architectures are elegant and simple,with stacking of networks in 2,but a rather complex network with a threefold interpenetration pattern was found in 1.Thermal stability of these compounds has been investigated by thermogravimetric analysis(TGA) of mass loss.     

Synthesis and Crystal Structure of Bis（p—aminotoluene）—bis（dimethylglyoximato） Cobalt（Ⅲ） Perchlorate

The title compound (C22H32.5ClCoN6O8.25,Mr=607.42)crystallizes in the orthorhombic system,space group c222 1 with a=11.320(2),b=20.933(4),c=23.936(5)A,V=5672(2)A^3,Dc=1.423g/cm^3,Z=8,μ(MoKα）=0.754mm^-1,F(000)=2532,R=0.0512 and wR=0.1190,There are eight complex molecules [Co(C4H6N2O2)(C4H8N2O2)(C7H9N)2]ClO4.0.25H2O of C2 crystallographic symmetry in a unit cell,including two crystallographically independent molecules,in which different orientations of the MePhNH2 groups are found.Two MephNH2 groups are in trans position for molecule A,and cis for B.The central metal atom is in a distroted octahedral environment.The hydrogen bonds of O-H(oxime)…O and N-H(p-aminotoluene group)…O construct an one-dimensional chain along the c axis in the title compound.     

A new oxidovanadium(Ⅳ) Schiff base complex containing asymmetric tetradentate ONN0O0Schiff base ligand:Synthesis,characterization,crystal structure determination,thermal study and catalytic activity

After synthesis of an asymmetric tetradentate ONN0O0 Schiff base ligand(H2L) followed by reaction of the synthesized H2 L with an equimolar mixture of methanolic solutions of the VO(acac)2, a new oxidovanadium(IV) Schiff base complex(VOL) was synthesized. The Schiff base ligand and its complex were characterized by FT-IR and UV–vis spectra and C, H, N analysis. The crystal structure of VOL was also determined by single crystal X-ray analysis. The VOL complex crystallizes in monoclinic space group Cc. The Schiff base ligand acts as a tetradentate ligand through its two iminic nitrogens and two phenolic and acetylacetonate oxygens. Thermogravimetric analysis of the VOL showed that it decomposes in two steps and converts to mixed vanadium oxides at 477 8C. In addition, thermal decomposition of the VOL complex in air at 660 8C leads to formation of V2O5 nanoparticles with the average size estimated from XRD 49 nm. The catalytic activity of the VOL complex was investigated in the epoxidation reaction and different reaction parameters were optimized. The results showed that the cyclic alkenes were efficiently converted to the corresponding epoxides, whereas the VOL did not appreciably convert the linear alkenes.     

Synthesis,Crystal Structure,and Cytotoxic Property of Di(μ1’’,1’’-azide)bis(4-nitro-2-(3'-dimethylamino- n-propylimino)methylenephenolate)dizinc(Ⅱ)

The title azide-bridged dinuclear Schiff base zinc(II) complex [Zn2(C12H16N3O3)2- (μ1,1-N3)2] was prepared and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group P21/n with a = 8.736(2), b = 14.850(3), c = 11.775(2) , β = 102.42(3)o, V = 1491.8(5) 3, Z = 2, Dc = 1.593 g/cm3, Mr = 715.36, λ(MoKα) = 0.71073 , μ = 1.669 mm-1, F(000) = 736, the final R = 0.0338 and wR = 0.0789. A total of 3411 unique reflections were collected, of which 2777 with I > 2σ(I) were observed. The molecule of the complex is located on a crystallographic inversion centre. Each Zn atom in the complex is five-coordinated by one Schiff base ligand and two bridging azide groups, forming a trigonal bipyramidal configuration. The Zn···Zn distance is 3.328(2) . In the crystal structure, molecules are linked through intermolecular C–H···N hydrogen bonds, forming layers parallel to the bc plane. The complex shows low cytotoxic property to both normal and carcinoma cells.     

Synthesis, Crystal Structure and Electrochemistry Properties of a (N,N'-Ethylene-bis(salicylaldiminato)) Nickel(II) Complex, [Ni_2(salen)_2]·NCS·NH_4

A new Ni(II) complex [Ni2(salen)2]·(NCS)·NH4 (salen = N,N’-bis(salicylidenea- mino)ethanato) has been prepared and structurally characterized by elemental analysis, IR spectra and single crystal X-ray diffraction. It crystallizes in the orthorhombic system, space group Pbca with a = 16.8725(13), b = 19.0046(15), c = 20.0583(16) , Z = 8, V = 6431.8(9) 3, C33H32N6Ni2O4S1, Mr = 726.13, Dc = 1.500 g/cm3, F(000) = 3008, μ = 1.284 mm-1, the final R = 0.0394 and wR = 0.0767 for 4449 observed reflections with I > 2σ(I). The complex involves a N,N’-ethylene-bis(salicylaldiminato) Schiff base, an isothiocyanato anion and an ammonium cation. The nickle(II) ion adopts a distorted square coordination geometry with N2O2 set of Schiff base ligand. The complexes are linked into a dimmer via intermolecular hydrogen bonds and the [Ni(salen)] moieties are connected together to form a 2-D layer structure by intermolecular N–H…O hydrogen bonds and π-π stacking. Cyclic-voltammetry method was used to characterize electrochemically the complex.