【摘 要】
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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 a
【机 构】
：
College of Chemistry and Chemical Engineering,Department of Chemistry and Life Science
论文部分内容阅读
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.
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