二价镉配合物的合成与表征

Crystal structure and characteristics of cooperate complex Cd(Ⅱ)

由硝酸镉和2,3-吡嗪二羧酸(简称pdc)水热反应,得到无色透明针状单晶.经X射线单晶衍射法测定了该晶体的分子结构,其组成为[Cd(C6H2N2O4)]n或[Cd(pdc)]n.晶体学数据为:三斜晶系,P21/c空间群.a=1.072 8(6)nm,b=0.773 1(5)nm,c=0.867 4(5)nm,β=110.068(5)°,Z=4,μ=3.21 mm-1,R1=0.023,wR2=0.054.该化合物通过2个CdⅡ与pdc中的氧原子配位,形成一个新颖的二维结构.

The transparent colorless single crystal was obtained by reacting cadmium nitrate with pdc where pdc is the pyrazine-2,3-dicarboxylate anion. The crystal structure was determined by X-ray diffraction. The crystal structure indicates that for ECd（C6H2N2O4）n or ECd（pac）n, the Cd^Ⅱ atom is six coordinated by five carboxylate O atoms and one N atom from five different pdc ligands in a distorted octahedral CdOsN coordination geometry. The two CAn atoms are bridged by carboxylate groups of the pdc ligands to create a dimeric unit. The dimeric units are further connected by the pdc ligsnds to generate an interesting two-dimensional structure.