二羟基萘二磺酸根构筑的一维链状镉配位聚合物的合成与晶体结构

Synthesis and Crystal Structure of a 1D Chain-Like Cd(Ⅱ) Coordination Polymer Based on Dihydroxynaphthalenedisulfonate

采用常规溶液挥发法,3,6-二羟基-2,7-萘二磺酸二钠盐(Na2H2dhns)、咪唑(imdz)与Cd(NO3)2·4H2O在甲醇-水溶液中反应合成了一种一维镉配位聚合物{[Cd2(dhns)(imdz)4]·H2O}n(1),并用元素分析、IR、UV、PL和TG等方法进行了表征。经X-射线单晶衍射分析确定了其晶体结构,晶体属单斜晶系,空间群C2/m,晶胞参数a=1.245 97(6)nm,b=1.558 33(9)nm,c=1.629 99(10)nm,β=90.258(6)°,V=3.164 8(3)nm3,Z=4,Mr=831.39,Dc=1.745 g·cm-3,μ=1.534 mm-1,F(000)=1 640,R=0.056 4,wR2=0.140 5,S=1.09。每个Cd髤处于畸变的八面体配位环境,2个八面体共同形成双核金属簇,金属簇经dhns4-四重桥联形成一维配位聚合物。

A 1D cadmium（Ⅱ） coordination polymer, {[Cd2（dhns）（imdz）4]·H2O}n （1）, was synthesized by reaction of disodium 3,6-dihydroxy-naphthalene-2,7-disulfonate （Na2H2dhns）, imidazole （imdz） and Cd（NO3）2·4H2O in a water-methanol solution, and characterized by elemental analysis, IR, UV, PL, TG and single crystal X -ray diffraction. The complex crystallizes in the monoclinic system, space group C2/m, a=1.245 97（6） nm, b=1.558 33（9） nm, c=1.629 99（10） nm, β=90.258（6）°, V=3.164 8（3） nm3, Z=4, Mr=831.39, Dc=1.745 g·cm-3, μ=1.534 mm-1, F（000）=1 640, R=0.056 4, wR2=0.140 5, S=1.09. In 1, dhns4-ligands bridge two edge shared distorted octahedrons, in which Cd（Ⅱ） ions are in the center, forming 1D chains that are further connected by intermolecular hydrogen-bonding interactions, generating a 3D supramolecular network. CCDC： 939692.