Synthesis,Crystal Structure and Properties of a New Cd(Ⅱ) Complex Based on Mixed 5-Hydroxy-isophthalic Acid and 1-(1H-imidazol-4-yl)-3-(4H-tetrazol-5-yl)benzene Ligands

A new coordination polymer [Cd2(5-IPA)(HL)2(H2O)2]·4H2O(1) was prepared under hydrothermal conditions based on 5-hydroxy-isophthalic acid(5-H2IPA) with multi-N-donor ligand 1-(1H-imidazol-4-yl)-3-(4H-tetrazol-5-yl)benzene(H2L). The complex was characterized by IR spectroscopy, TGA, X-ray powder and single-crystal diffraction. It crystallizes in the monoclinic system, space group C2/c with a = 23.6291(18), b = 9.9847(8), c = 17.7244(14) ?, β = 124.6180(10)?, V = 3441.4(5) ?3, Z = 4, C28H30N12O11Cd2, Mr = 935.44, Dc = 1.805 g/cm3, μ = 1.313 mm-1, S = 1.055, F(000) = 1864, the final R = 0.049 and w R = 0.1315 for 2985 observed reflections(I 2σ(I)). The central metal Cd(II) atoms with octahedral coordination geometry are six-coordinated by three oxygen and three nitrogen atoms. The HL- ligands from the deprotonated H2 L connect Cd(II) atoms to form two-dimensional(2D) double-layer fes networks which are further pillared by 5-IPA2- ligands into a rare binodal(3, 4)-connected three-dimensional(3D) architecture with a(4·6·8)(4·62·83) fsc-3,4-C2/c topology. Solid state luminescent property and sorption property of 1 have been investigated.     

Hydrothermal Synthesis,Crystal Structure and Properties of a New Copper(Ⅱ) Coordination Polymer with 3-(2-Pyridiyl)-1H-1,2,4-triazole(Hpt)

A new copper(Ⅱ) coordination polymer [Cu_2(C_7H_5N_4)_2(3-C_6H_5NO_2)_2]_n(1) has been hydrothermally synthesized with copper hydroxide, 3-(pyridin-2-yl)-1,2,4-triazole(Hpt) and 3-pyridinecarboxylic acid(3-PCA). It crystallizes in the monoclinic space group C2/c, with a=16.854(2), b=7.8616(8), c=20.630(2) ?, β=111.126(2)o, V=2549.7(5) ?3, Dc=1.723 g/cm3, Z=8, F(000)=1336, the final GOOF=1.065, R=0.0380 and w R=0.0972. The whole molecule consisting of two copper ions are bridged by two μ_2-η~1:η~0-3-(pyridin-2-yl)-1,2,4-triazole anions. The coordination environment of Cu(1) ion is CuO_2N_4, giving a distorted octahedron geometry. 1 exhibits antiferromagnetic interaction, and the electron transfer of 1 is irreversible in electrode reactions and the TG analysis shows that 1 is stable below 235 ℃.     

Mixed-solvothermal Synthesis,Crystal Structure and Luminescence of a New Dinuclear Yttrium(Ⅲ) Coordination Polymer with 1-D Wave-like Infinite Chains

A new dinuclear Y~(3+) coordination polymer{[Y_2(H_2O)_2(C_(14)H_8O_4)_3(C_(12)H_8N_2)_2]·3 H_2O}_n (1, C_(14)H_8 O_4 = 2,2?-biphenyldicarboxylate, phen = 1,10-phenanthroline), has been obtained by means of a mixed-solvothermal method using ethylene glycol and water as solvent. The compound was characterized by elemental analysis, energy-dispersive X-ray spectroscopy(EDS), IR spectrum and single-crystal X-ray diffraction. The results reveal that 1 belongs to monoclinic system, space group C2/c with a = 24.249(3), b = 12.069(48), c = 22.7304(08) ?, β = 113.480(7)°, Z = 4, V = 6102(2) ?~3, Dc = 1.462 g·cm~(-3), F(000) = 2728, μ = 1.968 mm~(-1), the final R = 0.0673, w R = 0.1508 and S = 1.085. Its structure can be regarded as a 1-D coordination polymer constructed by Y~(3+) cations, 2,2?-biphenyldicarboxylate, 1,10-phenanthroline and water molecules. The compound not only contains two kinds of organic ligands, but also exhibits interesting wave-like infinite chains and 18-MR windows with the diameter of 4.070(7)? × 5.326(9)?. The structure is further stabilized by means of O–H···O hydrogen bonds and π-π stacking interactions. Furthermore, the luminescent properties(including emission spectrum, CIE chromaticity coordinate and decay curve) of 1 were also investigated in the solid-state at room temperature.     

Synthesis,Crystal Structure and Fluorescent Properties of a Cadmium(Ⅱ) Complex with 3-(Pyridin-4-yl)-5-(pyrazin-2-yl)-1H-1,2,4-triazole

Compound [Cd_(1.5)(ppt)Br_2(H_2O)]_(2n)(1),where Hppt = 3-(pyridin-4-yl)-5-(pyrazin-2-yl)-1H-1,2,4-triazole,has been synthesized under hydrothermal conditions and characterized by elemental analysis,IR spectra,powder XRD,and X-ray diffraction.Compound 1 crystallizes in the triclinic system,space group P1 with a = 7.4402(6),b = 8.0570(7),c = 12.8674(11) ?,α = 89.7300(10),β = 89.8570(10),γ = 68.3910(10)°,V = 717.13(10) ?3,Z = 1,Dc = 2.638 g/cm3,μ = 7.824 mm~(-1),F(000) = 534,the final R = 0.0324 and w R = 0.1084 for 2324 observed reflections with I 2σ(I).X-ray diffraction analyses revealed that complex 1 is a 2D layered coordination polymer constructed from the linkage of [Cd_3(μ-Br)_4] trinuclear units with ppt-spacers,and a 3D supramolecular architecture is further assembled in 1 via hydrogen-bonding contacts.Fluorescence measurements show that 1 has medium fluorescent emission at 450 nm.     

Synthesis,Crystal Structure and Properties of a 3-Fold Interpenetrating 3D Cd(Ⅱ) Complex Derived from 4-(2-Methyl-1H-imidazol-1-yl)benzoic Acid

A new Cd~Ⅱ coordination complex,namely [Cd(iba)_2]_n(1),was prepared by the hydrothermal reaction of Cd(NO_3)_2·4H_2O with 4-imidazol-1-yl-benzoic acid(Hiba). Single-crystal X-ray diffraction analysis shows that compound 1 crystallizes in monoclinic system,space group Cc with a = 11.403(4),b = 30.480(9),c = 7.732(3) ?,β = 130.189(4)o,V = 2503.0(1) ?~3,Z = 4,C_(22)H_(18)CdN_4O_4,Mr = 514.80,Dc = 1.666 g/cm~3,F(000) = 1032 and μ(Mo Kα) = 1.101 mm-1. The final R and wR are 0.0573 and 0.1823 for 4421 observed reflections with I 2σ(I). Each iba-ligand coordinates in a bidentate fashion,connecting the Cd(Ⅱ) atoms to form a 2D wave-shape layer structure,which can be simplified as a four-connected topological net. Interestingly,the 2D layers are further extended into a 3-fold interpenetrating 3D architecture. Compound 1 displays an emissive maximum at 455 nm in the solid state at room temperature and a response of the second harmonic generation(SHG) activity is approximately 0.8 times that of KDP.     

Two Coordination Polymers Constructed by Cd(Ⅱ) and Zn(Ⅱ) with in situ Generated 5-(3-Pyridyl)tetrazolate Ligand:Syntheses,Crystal Structures and Luminescence Properties

Hydrothermal reactions of 3-cyanopyridine and Na N3 with Zn Cl_2 or Cd Cl_2·5/2H_2 O in the presence of 1,4-benzenedicarboxylic acid(H2bdc) yielded two new coordination polymers,{[Zn(3-ptz)(bdc)_(0.5)(H_2O)_2]n·2H_2O}_n(1) and [Cd_2(3-ptz)_2Cl_2]_n(2),based on in situ synthesized 5-(3-pyridyl)tetrazolate(3-ptz-) organic ligand.They have been structurally characterized by elemental analysis(EA),infrared spectroscopy(IR) and single-crystal/powder X-ray diffraction(PXRD).In 1,two Zn(Ⅱ) ions are linked together through two μ_2-(3-ptz-) ligands to form a dimeric unit of [Zn(μ_2-3-ptz)(H_2O)_2]_2~(2+),which is further connected with other equivalent units by μ_2-bdc~(2-)spacers,resulting in an infinite 1D polymeric chain of [Zn_2(3-ptz)_2(H_2O)_2(bdc)]_n,and then strong hydrogen bonding interactions extend these 1D chains into a 3D supramolecular structure.In 2,the Cd(Ⅱ) ions are connected through μ_4-(3-ptz-) ligands and Cl-anions,leading to infinite 2D layers of [Cd_2(3-ptz)Cl_2]_n~(n+),which are further linked by another μ_4-(3-ptz-) pillared ligand to form a 3D layered-pillared framework architecture of [Cd)2(3-ptz))2Cl)2])n.Furthermore,thermal stability of these compounds was measured by thermogravimetric analysis(TGA) and their photoluminescent properties were also investigated in the solid state at room temperature.     

A New Cd(Ⅱ) Coordination Polymer Constructed by 1,10-Phenanthroline Derivative: Syntheses,Structure, Physical Properties and Theoretical Calculation

A new Cd(Ⅱ) coordination polymer, [Cd(L)_2(H_2O)]_n(1), has been hydrothermally synthesized by using 1-(1 H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)naphthalen-2-ol(HL),(3-(4-(carboxymethoxy)phenyl)acrylic acid and Cd(NO_3)·4 H_2O. It crystallizes in monoclinic, space group P2_(1/c) with a = 19.41(2), b = 11.078(12), c = 20.09(2) ?, β = 116.824(17)o, V = 3855(7) ?~3, Z = 4, C_(46)H_(28)CdN_8O_3, Mr = 853.17, Dc = 1.470 g/cm~3, F(000) = 1728, μ(Mo Ka) = 0.621 mm~(-1), R = 0.0338 and wR = 0.0890. 1 shows a one-dimensional(1 D) zigzag chain structure. The neighboring chains are extended into a two-dimensional(2 D) layer structure by π-π interactions between adjacent L ligands. In addition, Natural Bond Orbital(NBO) analysis was performed by the B3LYP/LANL2DZ method in Gaussian 09 Program. The calculation results show the obvious covalent interaction between the coordinated atoms and Cd(Ⅱ) ion.     

Hydrothermal Synthesis,Crystal Structure and Luminescence Property of a 2D Manganese(Ⅱ) Coordination Polymer

Solvothermal reactions of MnCl_2·4H_2O with(pyridin-2-yl)methyl 4-(2-(4-((pyridin-2-yl)methoxy)phenyl)diazenyl)benzoate(L1) via an in situ ligand transformation reaction produced a new coordination polymer, {[Mn_(2.5)Cl_3L_2(H_2O)]·H_2O}_n(1, where HL = 4-(2-(4-((pyridin-2-yl)methoxy)phenyl)diazenyl)benzoic acid). The L1 ligand was decomposed in situ to L~- which was coordinated with Mn(Ⅱ) to form compound 1 in the solvothermal synthesis process. Complex 1 was characterized by IR spectroscopy, powder X-ray diffraction and single-crystal X-ray diffraction.Compound 1 possesses a 2D network. In addition, stability and photoluminescent property of 1 were also investigated.     

A New Cd(Ⅱ) Coordination Compound Based on 4-(1,2,4-Triazol-4-yl)phenylacetic Acid:Synthesis,Structure and Photoluminescence Property

A new complex [Cd_2(L)_2(Cl)_2(H_2O)]_n(1) was synthesized by reacting CdCl_2·2.5 H_2O 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) ?~3,Z = 4,C_(20)H_(16)Cl_2N_6O_5Cd_2,M_r = 716.09,D_c = 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.     

Crystal Structure and Luminescent Properties of a 3D Cd(Ⅱ) Compound Constructed from Succinate and 3,6-Di(4-pyridyl)pyridazine

A three-dimensional(3D) coordination polymer,[Cd(SC)(DPPD)]_n(1,H_2SC = succinic acid and DPPD = 3,6-di(4-pyridyl)pyridazine),has been synthesized by the solvothermal reaction of Cd(NO_3)_2·4H_2O with H_2 SC and DPPD at 120 oC in DMF solvent. Compound 1 crystallizes in the monoclinic system,space group P2_1/c,with a = 10.7993(4),b = 11.7705(3),c = 13.5336(6) ?,V = 1678.89(11) ?~3,Z = 4,C18H14N4O_4 Cd,M_r = 462.73,D_c = 1.831 g/cm~3,μ = 1.335 mm~(-1),F(000) = 920.0,the final R = 0.0500 and wR = 0.1567 for 3714 observed reflections with I 2s(I). In compound 1,the Cd(Ⅱ) ions are linked by the SC~(2–) ligands to give a two-dimensional(2D) undulating sheet based on the centrosymmetric dinuclear Cd_2(COO)_2 units. The 2D sheets are further connected by the DPPD ligands to produce a 3D structure,which is a 6-connected(4~4·6·~(10)·8) topological network based on the dinuclear Cd_2(COO)_2 node. Compound 1 exhibits a photoluminescent emission with a maximum at 540 nm upon excitation at 460 nm.     

Synthesis, Structure and Photoluminescence of a New Cd(Ⅱ)Coordination Polymer Based on 4-(Carboxymethoxy)-benzoic Acid and 1,10-Phenanthroline Derivative

A new 1D coordination polymer, [Cd2(L1)2(L2)2]·H2O (1, H2L1 = 4-(carboxy-methoxy)benzoic acid and L2 = 2-(4-fluorophenyl)-1H-imidazo[4,5-f][1,10]phenanthroline), has been hydrothermally synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. It crystallizes in triclinic, space group Pī with a = 9.985(5), b = 10.768(5), c = 12.512(5), α = 68.959(5), β = 80.354(5), γ = 79.663(5)°, V = 1227.4(10) 3, Z = 1, C56H36Cd2F2N8O11, Mr = 1259.73, Dc = 1.704 g/cm3, F(000) = 630, μ(MoKa) = 0.949 mm-1, R = 0.0261 and wR = 0.0655. The L1 anions link the neighboring Cd(II) atoms to form a 1D double chain structure. The L2 ligands are alternately located on both sides of the double chains. More interestingly, the lateral L2 ligands from adjacent double chains are paired to furnish strong π-π interactions, yielding a 2D supramolecular layer. N-H···O, O-H···N and O-H···O hydrogen bonds further stabilize the structure of 1. The luminescent property of 1 was studied in solid state at room temperature.     

A New Cadmium(Ⅱ) Coordination Polymer Constructed by 2-(2-Chloro-6-fluorophenyl)-1H-imidazo[4,5-f][1,10]phenanthroline and 1,2,3-Benzenecarboxylate: Synthesis,Structure and Luminescence

A new Cd(Ⅱ) coordination polymer, namely, [Cd3(1,2,3-BTC)2(L)2]·2.25H2O(1, L = 2-(2-chloro-6-fluorophenyl)-1H-imidazo[4,5-f][1,10]phenanthroline and 1,2,3-BTC = 1,2,3-benzenetricarboxylate), has been synthesized under hydrothermal conditions. The compound was characterized by single-crystal X-ray diffraction. It crystallizes in triclinic, space group P1 with a = 11.650(2), b = 12.240(2), c = 19.760(4), α = 72.01(3), β = 77.11(3), γ = 83.48(3)°, V = 2609.4(9) 3, Z = 2, C56H31Cd3Cl2F2N8O14.25, Mr = 1489.99, Dc = 1.896 g/cm3, F(000) = 1466, μ(MoKa) = 1.401 mm-1, R = 0.0401 and wR = 0.1104. Compound 1 shows a 1D chain structure, and the neighboring 1D chains of 1 are joined together by π···π interactions to result in a 2D supramolecular layer. In addition, the luminescent property of 1 has been studied in the solid state at room temperature.     

Self-assembly of a Mixed-valence Cu(Ⅰ)/Cu(Ⅱ) Coordination Polymer Derived from a Conformationally Flexible Tripodal Phosphoric Trimide Ligand

Reaction of a tripodal ligand, N,N?,N??-tris(3-pyridinyl) phosphoric trimide(TPPA) and CuBr_2·2H_2O result in the assembly of a new polymeric copper coordination polymer, which was characterized by single-crystal diffraction, infrared spectroscopy and elemental analysis. The polymer crystallizes in the triclinic system, space group P1 with a = 9.0964(5), b = 10.2592, c = 10.5822(8) ?, V = 933.01(9) ?~3, Z = 2, C_(30)H_(24)Br_4Cu_3N_(12)O_2P_2, M_r = 985.02, D_c = 1.753 g/cm~3, F(000) = 4072 and μ(MoKα) = 0.746 mm~(-1). The final R and w R are 0.0588 and 0.1329 for 4260 observed reflections with I 2σ(I). Cu(Ⅰ) is tetrahedrally coordinated and Cu(Ⅱ) center adopts square planar coordination geometry. Because of the flexibility of the TPPA ligands, the pyridyl rings rotate though a certain angle and three pyridyl rings on the same TPPA rotate by about 45° with respect to the central P=O groups. TPPA ligand acts as a tridentate ligand and is coordinated with three metal centers with its pyridyl donors to form a 2D-sheet like structure, and it is further connected by N–H···O and N–H···Br, resulting in a 3D network packing. Oxidation states of the metal center have been determined by bond valence sum calculation.     

Cd/Mn(Ⅱ) Complexes with Heterocyclic Substituted 1,2,4-Triazole Ligands:Syntheses,Crystal Structures,and Luminescence Properties

Based on a 3-(pyridine-2-yl)-4H-1,2,4-triazole ligand(Hpytr), one 2D Cd(Ⅱ) coordination polymer [Cd I(pytr)]_n(1) and one 2D Mn(Ⅱ) coordination polymer [Mn(N_3)(pytr)(H_2O)]_n(2) have been synthesized and characterized by X-ray crystallography, elemental analysis, and fluorescence spectroscopy. 1 shows a layer coordination architecture linked by pytr ligand, and the Cd(Ⅱ) centers display slightly distorted square pyramid coordination geometries. Complex 2 shows a 2D pillared-layer coordination architecture bridged by N3-and pytr, and the Mn(Ⅱ) centers display slightly distorted octahedral geometries. The luminescent properties of 1 and the PXRD and thermal stability of complexes 1 and 2 were measured briefly.     

A New Luminescent Cd(Ⅱ) Coordination Polymer Constructed by Mixed 1,4-Naphthalenedicarboxylate and N-donor Chelating Ligand

In this work, we synthesized a new two-dimensional Cd(Ⅱ) coordination polymer, [Cd(1,4-NDC)(L)](1), by using mixed 1,4-naphthalenedicarboxylic acid(1,4-H_2NDC) and typical chelating N-donor ligands 2-(2-chloro-6-fluorophenyl)-1H-imidazo[4,5-f][1,10]phenanthroline ligand(L). Compound 1 crystallizes in monoclinic, space group P_21/n with a = 12.936(5), b = 15.245(5), c = 13.499(5) ?, β = 105.456(5)o, V = 2565.9(16) ?~3, Z = 4, C_(31)H_(16)CdClFN_4O_4, M_r = 675.33, D_c = 1.748 g/cm~3, F(000) = 1344, μ(MoKa) = 1.011 mm~(-1), R = 0.0350 and wR = 0.0926. In 1, each 1,4-NDC anion bridges three adjacent Cd(Ⅱ) atoms to give a two-dimensional layer structure. The L ligands are attached on both sides of the layer in chelating coordination modes. In addition, the N–H···O hydrogen bond between L and 1,4-NDC further stabilizes the layer structure of 1. Moreover, the solid state luminescent property of 1 was also investigated at room temperature.     

A Novel 3D Cd(II) Coordination Polymer with an Unusual 3-Connected(8~2·10) Lig Net: Synthesis,Crystal Structure and Luminescent Properties

A new 3D Cd(II) coordination polymer, [Cd(Hpidc)]n(1, H3 pidc = 2-(pyrid-2-yl)-1H-imidazole-4,5-dicarboxy acid), has been prepared and characterized by elemental analysis, IR spectra, PXRD, and single-crystal X-ray diffraction. Compound 1 crystallizes in orthorhombic, space group Fdd2 with a = 22.833(9), b = 25.536(9), c = 7.437(3) A, V = 4336(3) A3, Z = 16, Dc = 2.105 Mg·m-3, μ = 2.025 mm-1, F(000) = 2656, and the final R = 0.0261 and w R = 0.0636. The structure determination reveals that 1 exhibits a rare 3D 3-connected lig net with a point symbol of(82·10). In addition, the solid state properties such as thermogravimetric analysis and luminescence of 1 were also studied.     

A New Luminescent Cd(Ⅱ) Coordination Polymer Constructed with 2-(Carboxymethoxy) benzoic Acid

In this work, we synthesized a new Cd(Ⅱ) coordination polymer, [Cd(L)(cmb)H_2O]· H_2O(1), by using mixed 2-(carboxymethoxy)benzoic acid(H2 cmb) and typical chelating N-donor ligands 2-(2-fluoro-6-fluorophenyl)-1 H-imidazo[4,5-f][1,10]phenanthroline ligand(L). 1 crystallizes in monoclinic, space group P21/c with a = 17.6150(8), b = 9.7811(4), c = 18.1603(8) ?, β = 118.9150(10)o, V = 2738.9(2) ?~3, Z = 4, C28 H20 CdF2 N4 O7, Mr = 674.88, Dc = 1.637 g/cm3, F(000) = 1352, μ(Mo Ka) = 0.865 mm–1, R = 0.0643 and w R = 0.1976. In 1, the cmb2– anions link neighboring Cd(Ⅱ) atoms in a bis-chelating mode, yielding a one-dimensional chain structure along the b axis. The L ligands are attached on one side of the chain through chelating the Cd(Ⅱ) atoms, and are stacked with those of an adjacent chain through π-π interactions to generate a one-dimensional double-chain structure. Furthermore, the one-dimensional double-chains are stacked by C–H???π interactions between the carbon atom of L ligand and the benzene ring of cmb2–ligand to give a layer structure. Moreover, the solid state luminescent property of 1 was also investigated at room temperature.     

Synthesis and Characterization of a Trinuclear Zinc(Ⅱ) Complex with Schiff Base (1R,2R)-(-)-Diaminocyclohexane- N,N'-biscarboxyl-salicylidene)

A homochiral complex, Zn3(Hsalen)2(Py)4(H2O)2 (salen = (1R,2R)-(-)-diamino-cyclohexane-N,N'-biscarboxyl-salicylidene) 1, has been synthesized by solvothermal procedure and characterized by IR, microanalysis, TGA, powder and single-crystal X-ray crystallography. It crystallizes in monoclinic space group P2 with a = 10.9439(7), b = 10.1722(6), c = 27.3450(17), β = 97.5060(10)o, V = 3018.1(3) 3, Z = 2, Zn3(Hsalen)2(Py)4(H2O)2, Mr = 1363.33, Dc = 1.500 g/cm3, F(000) = 1408, μ = 1.257 mm-1, GOOF = 1.042, the final R = 0.0601 and wR = 0.1464 for 10322 observed reflections with I 2σ(I). The coordination polymer 1 possesses a 1D infinite zigzag chain architecture constructed by strong hydrogen bonding interactions and the polymeric chains are further assembled into a 2D supramolecular network structure via C-H···π interactions between the cyclohexane and aromatic rings of the ligand of adjacent chains. Simultaneously, π···π stacking interactions play an important role in forming the 2D supramolecular framework.     

Solvothermal Synthesis,Crystal Structure and Luminescent Property of a Two-dimensional Lead(Ⅱ) Compound:[Pb(bmzbc)_2]_n

A two-dimensional coordination polymer, [Pb(bmzbc)_2]_n(1)(Hbmzbc =4-benzimidazole-1-yl-benzoic acid), has been synthesized by the solvothermal reaction of Pb(NO_3)_2 with Hbmzbc at 120 ℃ in ethanol solvent. Compound 1 has been characterized by single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetry analysis, and IR spectrum. Compound 1 crystallizes in the orthorhombic system, space group Pccn, with a = 12.5801(7), b = 20.0795(11), c = 9.1830(6) ?, V = 2319.6(2) ?~3, Z = 4, C_(28)H_(18)N_4O_4Pb, M_r = 681.65, D_c = 1.952 g/cm~3, μ = 7.319 mm~(-1), F(000) = 1312, the final R = 0.0336 and wR = 0.0965 for 1699 observed reflection with I 2σ(I). In 1, the bmzbc~– ligands bridge the Pb(Ⅱ) ions to generate a 2-D sheet with(4, 4) topology. The complex exhibits turquoise photoluminescent emission with a maximum at 480 nm upon excitation at 300 nm.     

Hydrothermal Synthesis,Crystal Structure and Properties of One Binuclear Nickel(Ⅱ) Complex with 3-(2-Pyridiyl)-1H-1,2,4-triazole

A new binuclear nickel(Ⅱ) complex [Ni_2(C_7 N_4 H_5)_3(C_9 H_9 O_2)]n has been hydrothermally synthesized with nickel sulfate, 3-(pyridin-2-yl)-~1 H-1,2,4-triazole and 3,5-dimethylbenzoic acid(3,5-DMBA). It crystallizes in the triclinic space group P1 with a = 11.5769(7), b = 12.3115(7), c = 12.6431(7) ?, α = 81.4860(10)o, β = 64.2830(10)o, γ = 63.7130(10)o, V = 1453.45(15) ?~3, D_c = 1.604 g/cm~3, Z = 2, F(000) = 720, the final GOOF = 1.048, R = 0.0285 and wR = 0.0628. The crystal structure shows that the whole molecule consists of two nickel ions bridged by three μ_2-η~1:η~0-3-(pyridin-2-yl)-1,2,4-triazole anions. The coordination environment of Ni(Ⅱ) ion is NiO_2 N_4 and NiN_5, giving a distorted octahedral geometry and square pyramidal geometry respectively. The luminescence and thermal properties of the complex were investigated.