以N,N '-二(3-吡啶基)-吡啶-3,5-二甲酰胺(bppdca)和2-巯乙酸基烟酸(L)为混合配体,利用水热合成方法获得了一个二维的Co(Ⅱ)配位聚合物:{[Co(bppdca) (L)] ·3H2O}n,并通过元素分析、IR和单晶X射线衍射等技术手段确定了其结构.该配合物分子式为C25H24N6O9SCo,单斜晶系,P21/c空间群,a=1.07419(9) nm,b =0.86166(6) nm,c=2.9853 (2) nm,β=96.772(1)°,Z=4,V=2.7439(4) nm3,Mr=643.49,Dc=1.558 g/cm3,F(000) =1324,μ=0.766 mm-,S=1.051,R=0.0406,wR =0.1160.晶体结构分析表明,配合物中的CoⅡ与来自2个bppdca配体的2个N原子、1个L阴离子的单齿羧基O原子和S原子以及来自另一个L阴离子的一个羧基中的2个O原子配位形成八面体配位构型.相邻的CoⅡ通过L阴离子连接成一维螺旋链[Co(L)]n,相邻的左、右螺旋链通过成对的bppdca配体拓展成二维配位网络.最终,相互平行的二维网络通过氢键作用拓展成三维超分子框架.另外,还研究了该化合物的热稳定性、电化学性质、荧光性质以及选择性光催化性质.
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