One-dimensional Coordination Polymers of rctt-1,3-Diphenyl-2,4-bis[2-(5-phenyl)-oxazolyl]cyclobutane with CuCl2 and CoCl2

The Cu(Ⅱ) and Co(Ⅱ) supramolecular coordination polymers,[CuCl2(DPO)-(CH3CN)0.5(CH2Cl2)0.5]n(CuDPO,DPO=rctt-1,3-diphenyl-2,4-bis[2-(5-phenyl)oxazolyl]cyclo-butane) and [CoCl2(DPO)]n(CoDPO),were synthesized and characterized by single-crystal X-ray diffraction method.CuDPO crystallizes in monoclinic,space group P21/n,with a=11.243(5),b=16.070(8),c=19.872(9) ,β=95.678(10)°,Z=4,V=3573(3) 3,C35.50H28.50Cl3CuN2.50O2,Mr=692.00,Dc=1.287 g/cm3,μ=0.868 mm-1,F(000)=1420,S=1.089,(△/σ)max=0.069,the final R=0.0682 and wR=0.1749.CoDPO is of monoclinic,space group P21/n,with a=11.396(4),b=15.151(5),c=17.673(6) ,β=90.528(6)°,Z=4,V=3051.4(17) 3,C34H26Cl2CoN2O2,Mr=624.40,Dc=1.359 g/cm3,μ=0.770 mm-1,F(000)=1284,S=0.981,(△/σ)max=0.001,the final R=0.0471 and wR=0.0961.In each case,the metal cation is coordinated by two Cl anions and two N atoms from oxazole ring of the ligands,which leads to the formation of a one-dimensional polymeric structure.It is found that the cyclobutane ring of coordinated DPO adopts a distorted conformation in the crystal,which is attributed to the increased steric effect between adjacent aryl substituents for the coordination of oxazole ring to metal cation.Thermal gravimetric analysis of the two complexes was also observed.     

Synthesis and Crystal Structure of a New Cadmium（ Ⅱ ） Polymer with One-dimensional Chain Structure： [Cd（5-hip）（phen）]n·nH2O （5-hip = 5-Hydroxyisophthalate,phen = 1,10-Phenanthroline）

A new metal-organic coordination polymer [Cd（5-hip）（phen）]n·nH2O 1 has been hydro- ermally synthesized and characterized by elemental analysis, IR, TG and single-crystal X-ray diffraction. The crystal of the complex crystallizes in monoclinic, space group P2/n with a = 8.8071（17）, b =12.386（2）, c = 16.981（3） A, β = 100.182（2）°, V = 1823.2（6） A^3, Mr=. 490.73, Dc =1.788 g/cm^3,μ（MoKa） = 1.240 mm^-1, F（000） = 976, Z= 4, the final R = 0.0458 and wR = 0.1373 for 2864 observed reflections （I 〉 2σ（I））. The Cd atoms are coordinated by two N atoms from the phen ligands and four O atoms from 5-hydroxyisophthalate ligands in a highly distorted octahedral geometry.     

Synthesis, Crystal Structure and Electrochemical Properties of One-dimensional Chain Coordination Polymer [Co（Ⅱ）（C6H5CH=CHCOOH）2（4,4＇-bipy）（H2O）5]n

A one-dimensional chain coordination polymer [Co（Ⅱ）（C6H5CH--CHCOOH）2（4,4＇- bipy）（H20）5]n has been synthesized with cinnamylic acid, 4,4＇-bipy and cobaltous chloride as raw materials. Crystal data for this complex： monoclinic, space group P21/c, a = 1.1481（3）, b = 1.1230（2）, c = 1.1759（3） nm, β = 97.054（4）^o, V= 1.5046（6） nm^3, Mr= 617.50, Dc = 1.363 g/cm^3, Z = 2, ,u（MoKa） = 0.627 mm^-1, F（000） = 646, S = 1.062, R 0.0443 and wR = 0.1178. The crystal structure shows that two neighboring cobalt（ID ions are linked together by one 4,4＇-bipy, and the whole complex molecule adopts a one-dimensional chain structure. Each cobalt（H） ion is coordinated with two nitrogen atoms from two 4,4＇-bipy molecules and four oxygen atoms from four water molecules, giving a distorted octahedral coordination geometry. The electrochemical properties were analyzed by combining with the crystal structure.     

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.     

Synthesis and Crystal Structure of a Novel 3D Inorganic-organic Hybrid Metallic Coordination Polymer, [Na2Cd（2,6-pyda）（N3）2（H2O）6]n

A novel coordination polymer [Na2Cd（2,6-pyda）（N3）2（H2O）6]n （2,6-H2pyda = 2,6- pyridinedicarboxylic acid） has been synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group C2/c, with a = 24.416（4）, b = 10.7638（17）, c = 6.9224（11） A^°, β= 106.124（2）A^°, V = 1747.7（5） A^°3, Mr = 515.64, De= 1.960 g/cm^3,μ = 1.365 mm^-1, F（000） = 1024, Z = 4, the final R = 0.0426 and wR = 0.1320. In the title complex, there exist two kinds of metal centers in the structure, cadmium ions and sodium ions. The Cd（Ⅱ） atom shows a distorted pentagonal-dipyramidal geometry defined by two O and one N atoms from one deprotonated pyda ligand and four N atoms from four μ-1,1,3 azido groups. The adjacent cadmium atoms are bridged via two μ-1,1,3 azido groups, along the c axis to afford an extended chain. There is also a 2D network which is comprised of binuclear subunits [NaE（H2O）6] connected by O atoms from coordinated water between the adjacent Cdn（pyda）n（Na）2n infinite chains. Furthermore, each cadmium atom is connected with four adjacent sodium atoms through the bridging N3- ligand in μ-1,3 patterns. Thus, the title complex exhibits a novel three-dimensional network structure.     

A New Dinuclear Cu（Ⅱ） Complex of a Ligand with Benzimidazole Group - Synthesis and Crystal Structure

A new dinuclear copper complex, [Cu（C9H11N3）Cl2]2（C18H22Cl4Cu2N6）, has been synthesized and characterized by X-ray structure determination. It crystallizes in the triclinic P1^- space group with a = 7.526（3）, b = 9.473（4）, c = 9.535（3）A, α = 117.214（10）, β = 108.251（9）, γ = 91.560（6）°, V = 562.3（4）A^3, Z = 1, Mr = 591.30, F（000） = 298, Dc = 1.746 g/cm^3, μ（MoKα） = 2.385 mm^-1, the final R = 0.0577 and wR = 0.1248 for 2188 unique reflections with 1629 observed ones （Ⅰ〉 2σ（Ⅰ））. In the title complex, each copper（Ⅱ） atom is located at the center of a distorted trigonal bipyramid of five coordination atoms （two nitrogen and three chlorine atoms）. Two copper（Ⅱ） atoms were bridged by two chlorine anions （Cl（2） and Cl（2a）） to form a Cu（Ⅱ）-Cu（Ⅱ） binuclear entity with the distance between two copper（Ⅱ） atoms of 3.398 （A）.     

四氯合钯(Ⅱ)酸双{[4-溴-2，6-二(N，N-二乙基氨基亚甲基)吡啶基]氯化钯(Ⅱ)}的合成及晶体结构

A palladium（Ⅱ） complex, [PdLCl]2· [PdCl4], [L=4-bromo-2,6-bis（N,N-diethylaminomethylene）pyridine], was synthesized and its crystal structure was determined by X-ray analysis. The complex crystallizes in monoclinic system with space group Cc, a=0.845 1（17） nm, b=1.836 5（4） nm, c=2.715 8（5） nm,β=93.99（3）°, V=4.204 8（15） nm^3, Z=4, R,=0.037 7 and wR2=0.076 9. The coordination geometry of the Pd atom in the cation is a slightly distorted square planar, with one pyridyl N and two N atoms of the diethylamine ligand, together with one Cl atom. The dihedral angle between the square planar （N3PdCl） and the pyridyl ring is 10.3（4）°. CCDC： 623421.     

Synthesis,Structure, Electrochemistry and Fluorescence Properties of a One-dimensional Coordination Polymer {[ CdLu-（4,4＇-dps） ]2（H2O）2]＇（4＇abs ）2（H2O）2

A new cadmium（N） compound, {[ CdLu-（4,4＇-dps） ]2（H2O）2]＇（4＇abs ）2（H2O）2n 1 （4,4＇-dps = 4,4＇-dipyridylsulfide, 4-abs = deprotonated 4-amino benzenesulfonic acid）, has been synthesized and structurally characterized. It belongs to the orthorhombic system, space group Pbcn with a = 19.950（3）, b = 10.6381（13）, c = 18.055（2）A, V= 3831.8（8） A3, Z = 4, C32H36CdN6010S4, Mr = 905.31, F（000） = 1848, μ= 0.850 mm^-1, Dc = 1.569 Mg/m^3, the final R = 0.0238 and wR = 0.0589 for 3080 observed reflections with I 〉 2σ（I）. Complex I is a one-dimensional linear chain coordination polymer and the repeat unit is comprised of doubly charged cadmium complex cation, uncoordinated 4-aminobenzene sulfonate anions and water molecules. The cadmium（H） ion adopts a six-coordinate distorted octahedral geometry. Complex 1 is stabilized and linked into a three-dimensional layered structure through intermolecular O-H…O and N-H…O hydrogen bonds together with electrostatic force. The cyclic voltammograms and fluorescence spectrum of 1 were also measured. It shows one irreversible redox process and emits a very strong and sharp fluorescent band at about 341 nm.     

Synthesis and Crystal Structure of a One-dimensional Silver（I） Coordination Polymer with 4,4＇-Bipyridine

The title compound, { [Ag2（bipy）2（H2O）2]·pydc·2H2O}n （bipy = 4,4＇-bipyridine, pydc = pyridine-3,5-dicarboxylate）, has been synthesized by the reaction of Ag2O with pydc and bipy in CH3OH solution. It crystallizes in the monoclinic system, space group C2/c with a = 21.419（8）, b = 7.515（3）, c = 18.070（7） A,β = 108.273（6）°, Mr = 765.27, V = 2761.9（17） A^3, Z = 4, Dc = 1.840 g/cm^3, F（000） = 1528,μ = 1.478 mm^-1, the final R = 0.0307 and wR = 0.0681. The structure determined demonstrated that the Ag（I） is three-coordinated by two nitrogen atoms from bipy and one water molecule, forming a one-dimensional coordination polymer [Ag2（bipy）2（H2O）2]n^2n＋, which is further linked to generate a two-dimensional layer structure via Ag---Ag attractions.     

Synthesis,Crystal Structure and Characterization of a New Coordination Polymer from the Self-assembly of CoCl_2 Salt and Flexible Ligand 1,3-Bis（4-pyridyl）propane

A new 1D coordination polymer [Co(bpp)3Cl2(H2O)2]n 1 (bpp = 1,3-bis(4-pyridyl)-propane) was synthesized and characterized by elemental analysis,IR spectrum and single-crystal X-ray diffraction. The crystal belongs to the orthorhombic system,space group Ibca with a = 16.569(9),b = 17.240(10),c = 27.087(16) ,V = 7738(8) 3,Z = 8,Dc = 1.306 g/cm3,Mr = 760.65,λ(MoKa) = 0.71073 ,μ = 0.623 mm1,F(000) = 3192,the final R = 0.0678 and wR = 0.2011. The Co(II) atom is coordinated in a slightly distorted octahedral CoN4Cl2 geometry by two Cl atoms in the axial positions,four N atoms from the two bridging bpp ligands and two pendant bpp ligands. The CoN4Cl2 octahedra are connected by the bridging bpp ligands to form a 1D neutral coordination polymer chain. The chains are linked by face-to-face π-π interactions between adjacent pendant bpp ligands to give rise to a 3D supramolecular architecture. The photoluminescent investigation indicates that the emission of 1 is attributed to ligand-centered emission. The variable-temperature magnetic susceptibility measurement shows weak antiferromagnetic behavior in the complex.     

Synthesis,Characterization and Crystal Structure of a Three-dimensional Coordination Polymer {[Cd（1,5-nds）（Him）2（H2O）]·2H2O}n

A novel cadmium（Ⅱ） coordination polymer {[Cd（1,5-nds）（Him）2（H2O）]·2H2O}n （1,5-nds = naphthalene-1,5-disulfonate and Him = imidazole） was synthesized based on the reaction of cadmium oxide and 1,5-naphthalenedisulfonic acid firstly, and then mixed with imidazole in methanol medium. Its structure was characterized by elemental analysis, IR and TGA, respectively. The crystal structure was determined by single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1, with a = 8.5420（10）, b = 10.2570（10）, c = 13.361（2） A, α = 100.704 （2）, β = 100.195（2）, γ = 108.873（3）°, C16H20Cd N4O9S2, Mr= 588.91, V = 1.0524（2） nm^3, Dc = 1.858 g/cm^3, Z = 2, F（000） = 592, β^ = 1.294 mm-1, R = 0.0397 and wR = 0.1007 for 3180 observed reflections （Ⅰ〉 2σ（Ⅰ））. Structural analysis shows that the cadmiun atom is coordinated with four oxygen atoms from three 1,5-nds and one water molecule together with two nitrogen atoms from two imidazoles, giving a distorted octahedral coordination geometry. The molecules are linked to form a two-dimensional coordination polymer based on bridging ligands of naphthalene- 1,5-disulfonate anions, the sheets of which are then interacted via hydrogen bonds, leading to a three-dimensional network structure.     

Hydrothermal Synthesis and Crystal Structure of Complex Mn2（phen）2（p-MBA）4（H2O）

A novel Mn（Ⅱ） complex Mn2（phen）2（p-MBA）4（H2O） has been hydrothermally synthesized by the reaction of p-methyl benzoic acid （p-MBA） with 1,10-phenanthroline （phen）. Crystal data for this complex： monoclinic, space group C2/c, a= 2.3328（3）, b =1.5549（2）, c = 1.5557（2） nm, β = 121.726（2）°, V= 4.7997（11） nm^3, Mr = 1028.85, Dc = 1.424 g/cm^3, Z = 4, F（000） = 2128, μ（MoKa） = 0.590mm^-1, GOOF = 1.060, R = 0.0333 and wR = 0.0767. In the crystal, each Mn（Ⅱ） ion is coordinated by two nitrogen atoms from one o-phenanthroline molecule, three oxygen atoms from three p-methyl benzoic acids and one oxygen atom from one water molecule, giving a six-coordinate distorted octahedral coordination geometry. Two neighboring Mn（Ⅱ） ions are bridged by two p-methyl benzoic acid groups and one water molecule, and their end positions are respectively coordinated by one 1,10-phenanthroline and one p-methyl benzoic acid molecule, giving a binuclear cage structure, of which the Mn（Ⅱ）…Mn（Ⅱ） distance is 0.3502 nm.     

Syntheses and Crystal Structures of [Na（H2O）1/2]X and NH2（CH2CH3）2X and Antioxidant Activity of the Former

In order to enhance the water-solubility and biological utilization rate of chrysin, sodium 5,7-dihydroxylflavone-8-sulfonate （1, [Na（H2O）1/2]X, X = C15H9OSO3, 5,7-dihydroxylfla- vone-8-sulfonate） was synthesized and its structure was identified on the basis of NMR, FT-IR and elemental analysis. The assembly of 5,7-dihydroxylflavone-8-sulfonate with diethylamide cation afforded diethylamide 5,7-dihydroxylflavone-8-sulfonate （2, NH2（CH2CH3）2X） which was characterized by FT-IR and elemental analysis. The crystal structures of 1 and 2 were determined by X-ray single-crystal diffraction analysis. The crystal of 1 is of triclinic system, space group P1, with a = 8.5628（13）, b = 12.8916（19）, c = 13.562（2） A, α = 82.494（1）, β = 78.601（2）, γ = 84.033（2）°, C30H20Na2O15S2, Z = 2, Mr = 730.59, V = 1450.3（4） A3, Dc = 1.673 g/cm3, F（000） = 748, p = 0.295 mm^-1, the final R = 0.0641 and wR = 0.1458. The crystal of 2 crystallizes in the triclinic system, space group Pi, with a = 7.689（2）, b = 11.184（3）, c = 11.734（3） A, α = 74.268（3）, βl = 81.751（4）, γ= 87.991（3）°, C19H21NO7S, Z = 2, Mr= 407.43, V= 961.2（4） A3, Dc = 1.408 g/cm3, F（000） = 428, p = 0.210 mm^-1, the final R = 0.0484 and wR = 0.1195. In 1, the three-dimensional structure is organized into organic and inorganic regions; the flavone skeletons are stacked into organic regions by π...π staeking interactions; inorganic regions are generated by Na-O coordination bonds among sulfonate groups, coordinated water molecules and NaI. The sulfonate groups play an important role as a bridge of inorganic and organic regions. One-dimensional chain structure of 2 is extended by N-H…O hydrogen bonds and π...π stacking interactions. Furthermore, the antioxidant activity of 1 was evaluated. The scavenging activity of 1 to DPPH free radical is better than that of the parent compound chrysin.     

Synthesis and Crystal Structure of a New Mononuclear Copper（Ⅱ） Complex with 4,4′,6,6′-Tetrabromo-2,2′- [ethylenedioxybis（nitrilomethylidyne）]diphenol

A new mononuclear Cu（II） complex, [Cu（L）] （H2L = 4,4′,6,6v-tetrabromo-2,2′- [ethylenedioxybis（nitrilomethylidyne）]diphenol）, has been synthesized and structurally characterized. X-ray crystal structure of the complex reveals that the Cu（Ⅱ） ion is four-coordinated by two oxygen atoms and two nitrogen atoms from L2- unit. Crystallographic data： monoclinic, space group P21/n with a = 14.076（2）, b = 6.9801（14）, c = 19.858 （2） A, β= 107.613（2）°, C16n10Br4CuN2O4, Mr = 677.44, V = 1859.6（5） A3, Dc = 2.420 g/cm3,μ = 9.796 mm^-1, F（000） = 1284, Z = 4, the final R = 0.0516 and wR = 0.0938 for 1879 observed reflections with I 〉 2σ（/）. The dihedral angel between the two coordination planes of Cu（1）-N（2）--O（4） and Cu（1 ）-N（ 1 ）-O（3）） is 30.08（6）°.     

Structural Evidence of Anion＇s Effect on the Ion Packing of [Ni2（teta）3]^4＋ in the View of H-bonding Interaction

Two dinuclear nickel（Ⅱ） complexes [Ni2（teta）3]Cl4＇2H2O1 and [Ni2（teta）3]（NO3）4 2 （teta = triethylenetetramine） were synthesized by a solvothermal method and structurally characterized. Complex 1： orthorhombic, Pbca, a = 13.791（3）, b = 13.078（3）, c = 18.323（4） ,A, V = 3304.8（12） A3, Z = 4, Mr= 733.98, Dc = 1.475 g/cm^3,μ = 1.500 mm^-1, F（000） = 1560, R = 0.0585 （I 〉 20（/）） and wR = 0.1243. Complex 2： orthorhombic, P212121, a = 7.8279（14）, b = 14.209（3）, c = 31.163（6）A, V = 3466.2（11）A3, Z = 4, Mr= 804.19, Dc = 1.541 g/cm^3,μ = 1.164 mm^-1 F（000） = 1704, R = 0.0401 and wR = 0.0840 for 5950 observed reflections （I 〉 2σ（I））. Two Ni^2＋ ions are connected by one linear bridging teta ligand, forming a dinuclear [Ni2（teta）3]^4＋ cation. Each Ni^2＋ ion in 1 and 2 takes a distorted octahedral geometry with six coordinated N atoms from two teta ligands. The effect of different anions on the arrangement of [Ni2（teta）3]^4＋ cations has been discussed in view of H-bonding interactions. Thermal stability of 1 and 2 was also investigated.     

Crystal Structure of a Novel Cadmium Coordination Polymer [Cd15（OH）4（SO4）4（L1）6（L2）12]n （HL1 = 1,2,3-1H-Triazole,HLe = 5-Methyl-lH-tetrazole

A novel cadmium coordination polymer [Cdls（OH）4（SO4）4（L1）6（L2）12]n （HL1 = 1,2,3-1H-triazole, HL2 = 5-methyl-lH-tetrazole） has been synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. The compound crystallizes in cubicI-43d space group with a = 21.5247（4）, V = 9972.7（3） A3, Z = 4, Dc = 2.360 g/cm3, Mr = 3543.68, μ（MoKα） = 3.298 mm^-1, F（000） = 6696, the final R = 0.0340 and wR = 0.0992 for 1909 observed reflections （I 〉 2σ（I））. The compound contains two crystallographicatly independent Cd coordination centers linked up through one L1 and two L2 bridges. The structure displays an inorganic-organic hybrid cadmium coordination polymer.     

Hydrothermal Synthesis and Crystal Structure of a Keggin Polyoxometalate [Co^Ⅱ（2,2′-bipy）2（H2O）]2[SiW^Ⅵ12O40]·2H2O

A Keggin-type tungstosilicate compound [Co^Ⅱ（2,2′-bipy）2（H2O）]2[SiW^Ⅵ12O40]·2H2O 1 （bipy = bipyridine） was prepared by a hydrothermal method for the first time. Single-crystal X-ray diffraction revealed that 1 （C40H40Co2N8O44SiW12） crystallizes in the triclinic system, space group P1 with a = 10.4979（6）, b = 13.3946（7）, c = 13.5756（8）A, α= 70.0769（18）, β = 68.910（3）, γ = 74.186（4）°, V = 1649.84（16）A^3, Mr = 3688.95, Z = 1, Dc = 3.713 mg·m^-3, μ = 21.432 mm^-1, F（000） = 1644, S = 1.058, the final R = 0.0511 and wR =0.1023 for 6523 observed reflections （I 〉 2σ（I））. Compound 1 consists of two coordinated cation fragments [Co^Ⅱ（2,2′-bipy）2（H2O）]^2＋, one normal Keggin polyanion unit [SiW^Ⅵ12O40]^4- and two lattice water molecules. To be noted, each polyanion unit is linked to two cation fragments by its two surface terminal oxygen atoms and two cobalt atoms of two cation fragments forming an organic-inorganic hybrid unit in 1. Furthermore, the compound shows strong photoluminescence property in the solid state at room temperature.     

Synthesis and Crystal Structure of N,N′,N″- Tris-（2-aminophenyltriphenylphosphium）- benzene- 1,3,5-tricarboxamide

A new tripodal P,N ligand （C63H48N3O3P3） was prepared and characterized by elemental analysis, IR and single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group P21/c with a = 13.013（3）, b = 28.406（6）, c = 14.911（3） A^°, β= 111.04（3）°, V= 5144.6（18） A^°^3 Z = 4, Dc = 1.276 g/cm^3, Mr = 987.95, λ（MoKa） = 0.71073 A^°,μ = 0.17 mm^-1, F（000） = 2064, R = 0.0786 and wR = 0.1545. A total of 43260 unique reflections were collected, of which 5112 with I 〉 2σ（I） were observed. The title compound has a central benzene ring, which is linked by -NH-CO- bonds to three 2-aminophenyltriphenylphosphium moieties, of which two with P（1） and P（2） centers are pointing to the same face of the central aryl ring, while the third one directs oppositely, forming a pseudo-propeller. In the crystal structure, there exist face-to-face π-π stacking interactions which increase the stability of the crystal structure.     

A Novel Two-dimensional Lead(Ⅱ) Coordination Polymer Based on Dinuclear Lead(Ⅱ) Unit Containing(5-Chloro-quinolin-8-yloxy) Acetate

A novel two-dimensional lead(II) coordination polymer 1, [C11H7Cl2NO3Pb]n, has been prepared by solvothermal reaction of new bridging ligand(5-chloro-quinolin-8-yloxy)acetic acid(HL) with PbCl2, and its structure was characterized by IR, elemental analysis, TG-DTA and single-crystal X-ray diffraction analysis. The crystal is of monoclinic system, space group P21/c with a = 16.7603(7), b = 8.6907(4), c = 8.4745(3), β = 101.1110(11)°, C11H7Cl2NO3 Pb, Mr = 479.27, V = 1211.25(9)3, Z = 4, Dc = 2.628 g/cm3, F(000) = 880, μ = 14.367 mm-1, R = 0.0173 and wR = 0.0508. The asymmetric unit contains one lead(II) cation, one(5-chloro-quinolin-8-yloxy)acetate(L) ligand and a chloride ion. The PbII center is hepta-coordinated in a distorted pentagonal bipyramidal geometry. The coordination sphere of the Pb atom is completed by two oxygen atoms and one nitrogen atom of the same L ligand, two bridging chloride ions and two bridging oxygen atoms of two adjacent L ligands. Two PbII centers are linked by the two L ligands to form a C2-symmetric dimer unit with a planar [Pb2O2] ring. Each dimer unit acts as a secondary building unit(SBU) and links adjacent four dimer units by the chloride atoms and oxygen atoms of carboxylate groups of L, forming a two-dimensional array. Such two-dimensional layers are packed through intermolecular C–H···Cl hydrogen bonds into a three-dimensional supramolecular structure. When the dimer unit is viewed as a 4-connected node, 1 is simplified as a 4-nodal 2-D network with square lattices of the diagonal lengths to be 6.079(1). The fluorescence emission peak of complex 1 appears near 407 nm.     

Synthesis,Structure and Luminescent Properties of [Zn（btzb）2Cl2]·2H2O [btzb = 1,2-Bis（5-tetrazolyl）benzene]

The title compound [Zn（btzb）2Cl2]·2H2O （1·2H2O, btzb = 1,2-bis（5-tetrazolyl）ben- zene） was synthesized in situ by the [2＋3] cycloaddition reaction of phthalonitrile with NaN3 in water in the presence of ZnCl2 under refluxing conditions. 1·2H2O crystallizes in the monoclinic system, space group P2 1/c with a = 9.0119（18）, b = 7.5566（15）, c = 18.076（5）A, β= 114.67（2）°, V= 1118.6（4）A^3, Z = 2, Dc = 1.784 g/cm^3, T= 223（2） K, C16H16N16O2Cl2Zn, Mr = 600.74, F（000） = 608, μ（MoKα） = 1.393 mm^-1, S = 1.081, R = 0.0306 and wR = 0.0669 for 1896 observed reflections with I 〉 2σ（I）. The Zn^2＋ ion of 1 is coordinated by four N atoms from two btzb ligands and two Cl atoms, forming a distorted octahedral coordination geometry. A number of intermolecular hydrogen bon- ding interactions between molecules 1 and/or the solvated water molecules result in a 3D hydrogen-bonded structure. The luminescent property of 1·2H2O was also investigated.