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.

Synthesis and Crystal Structure of a Novel 3D Inorganic-organic Hybrid Metallic Coordination Polymer, [Na_2Cd(2,6-pyda)(N_3)_2(H_2O)_6]n

A novel coordination polymer Na_2Cd(2,6-pyda)(N_3)_2(H_2O)_6]n(2,6-H_2pyda=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 α=24.416(4),b=10.7638(17),c=6.9224(11)(A),β=106.124(2)°,V=1747.7(5)(A)~3,Mr= 515.64,D_c=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 Na_2(H_2O)_6] connected by O atoms from coordinated water between the adjacent Cd_n(pyda)_n(N_3)_(2n) infinite chains. Furthermore,each cadmium atom is connected with four adjacent sodium atoms through the bridging N_3~- ligand in μ-1,3 patterns. Thus,the title complex exhibits a novel three-dimensional network structure.