| Coordination polymers and mutilnuclear complexes have attracted much attention because of their fascinating structures and their potential application in functional materials and so on . 2,6-pyridinedicarboxylate hydrazide and its derivatives are the polydentate organic ligands containing N,O atoms, which can coordinate to metallic ions and may exhibit various coordination modes, so they are the good ligands to design and synthesize novel complexes. We synthesized 8 unreported coordination compounds by using 2,6-bis(hydrazinocarbonyl) pyridine (BHP) and N,N'-bis (2'-pyridylimine)-2,6-pyridinedicarbohydrazide (H2L) as ligands. These compounds have been characterized by IR,elemental analysis and single crystal X-ray diffraction,the luminescent properties of some complexes have been studied as well. The main works are listed as follows:1. Four new complexes [Zn2(2,6-pda)]n (1),[Cd2(2,6-pda)2(H2O)3]n (2), Al2(2,6-pda)2·2H2O (3) and Hg(2,6-pda)(1,10-phen) (4) have been synthesized with ZnBr2,CdCl2·2.5H2O,Al2(SO4)3·18H2O and Hg(CH3CO2)2, BHP and 1,10-phen by hydrothermal process. In the hydrothermal process, BHP is hydrolyzed to 2,6-H2pda and then 2,6-H2pda coordinate with metal salts. Complex (1) crystallizes in the monoclinic space group C2 with a = 13.9300(16) A, b = 13.9400(17) A, c = 16.560(2) A,β= 101.870°; Complex (2) crystallizes in the monoclinic space group C2/c with a = 25.817(3) A, b = 9.7262(19) A, c = 13.371(2) A,β= 93.711(3)°; Complex (3) crystallize in the triclinic space group P1 with a = 12.218(2) A, b = 10.7343(18) A, c = 7.1939(15) A,β= 117.919(2)°;Complex (4) crystallizes in the Orthorhombic space group Fddd with a = 38.390(3) A, b =27.050(2) A, c = 4.0730(11) A,β= 90°. There are three kinds of coordination geometries of Zn(Ⅱ) ions in the complex (1), Zn1 is five-coordinated with distorted trigonal bipyramid, the coordination atoms is one N atom and two O atoms from 2,6-pda2-, two O atoms from two neighboring 2,6-pda2- ligands ; Zn2 is six-coordinated with distorted octahedronal geometry , the coordination atoms is two N atoms and four O atoms from two 2,6-pda2- ligands; Zn3 is four-coordinated with tetrahedron geometry.distorted trigonal bipyramid ,the coordination atoms are four O atoms from four neighboring 2,6-pda2- ligands . All carboxylates of the ligand adopt didentate bridging coordination modes. The carboxylates of the ligand 2,6-pda2- adopt didentate bridging coordination modes, the Zn atoms are further connected by carboxylate O to form an infinite 2D grid. In the complex (2), Cd(Ⅱ) ions are seven-coordinated with distorted pentagonal-bipyramidal geometry , the carboxylates of the ligand 2,6-pda2- adoptμ1,1-O didentate bridging coordination modes, Cd(Ⅱ) ions are double oxygen bridges to form a 1D chain. In the dinuclear complex (3), Al(Ⅲ) is six-coordinated with distorted octahedronal geometry , the coordination atoms is one N atom and two O atoms from 2,6-pda2- ligand, three O atoms from two OH and one H2O. The OH adoptμ1,1-O didentate bridging coordination modes and unite two Al(Ⅲ) atoms. The carboxylates of the ligand 2,6-pda2- adopt unidentate coordination modes. In the mononuclear complex (4), Hg(Ⅱ) ions is five-coordinated with distorted trigonal bipyramid ,the coordination atoms is one N atom and two O atoms from 2,6-pda2- and two N atoms from 1,10-phen. The carboxylates of the ligand 2,6-pda2- adopt unidentate coordination modes.2. One dinclear complex [Cd2(2,6-pda)2(BHP)2(H2O)2]·H2O (5) has been synthesized with CdCl2·2.5H2O, BHP and 2,2'-bpy by hydrothermal process, part of BHP is hydrolyzed to 2,6-H2pda, is formd. Complex (5) crystallizes in the triclinic space group P1 with a = 9.9970(13) A, b = 10.3800(15) A, c = 10.7740(16) A,β= 110.510(3)°. Cd(Ⅱ) ions are seven-coordinated with distorted pentagonal-bipyramidal geometry, the coordination atoms is one N atom and two O atoms from 2,6-pda2-, one O atom and two N atoms from two neighboring BHP ligands and one O atom from H2O.Every BHP ligand provides one O atom and two N atoms to coordinate with two Cd(Ⅱ) ions, two BHP ligands unite two Cd(Ⅱ) ions .3. Three new complexes {[Cu3(L)(ClO4)3(C2H5OH)2(H2O)]·(ClO4)}n (6), [Cu6(L)2(CH3COO)6(OH)2H2O] (7),{[Cu3(L)(SO4)2(H2O)3]·2H2O}n (8) have been synthesized with CuClO4·6H2O, Cu(CH3COO)2·H2O, CuSO4·5H2O and H2L by traditional synthesis methods. Complex (6) crystallizes in the monoclinic space group P21/c with a = 7.0348(15) A, b = 20.642(3) A, c = 27.400(3) A,β= 95.327(2)°. Complex (7) crystallizes in the monoclinic space group P21/m with a = 10.6485(15) A, b = 11.8421(16) A, c = 24.800(3) A,β= 98.400(2)°. Complex (8) crystallizes in the monoclinic space group C2/c with a = 15.3850(18) A, b = 12.8647(17) A, c = 15.046(2) A,β= 98.671(2)°. In the complex (6), Cu(Ⅱ) is six-coordinated with distorted octahedronal geometry; there are three diferrent coordination enviroment Cu atoms, every Cu atom is joined with the other which has the same coordination environment by ClO4-. So,one strap is formed with three Cu chains which are linked by O from ClO4-. The hexanuclear complex (7) have two same structure units. There are three Cu atoms in one unit; One Cu from one unit and two from the other are joined by the O atom from OH .There are two OH in one molecular. The O atoms from OH adoptμ1,1,1-O bridging coordination modes.There are two kinds of coordination geometries of Cu(Ⅱ) ions in the complex (8), Cu1 is five-coordinated with distorted trigonal bipyramid; Cu2 is six-coordinated with distorted octahedronal geometry . In Complex (8), there are three Cu atoms in one structure unit ,but two Cu atoms have the same coordination geometries. The O atom from SO42- adoptμ1,1,1-O bridging coordination modes, Cu(Ⅱ) ions which have the same coordination geometries are double oxygen bridges to form a 1D chain.
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