一个二维钴配位聚合物的合成、结构及光催化性质

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=2.743 9(4) nm³,M_r=643.49,D_c=1.558 g/cm³,F(000)=1324,μ=0.766 mm^-1,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Co^Ⅱ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。CCDC: 1010786

Synthesis,Crystal Structure and Photocatalytic Properties of a Two-Dimensional Cobalt Coordination Polymer

A new two-dimensional Co(Ⅱ) coordination polymer {[Co(bppdca)(L)] 3H₂O}_n[bppdca=N,N'-bis(pyridine-3-yl)pyridine-3,5-dicarboxamide, L=2-carboxymethylsulfanyl nicotinic acid] has been hydrothermally synthesized and structurally characterized by elementary analysis, IR and single crystal X-ray diffraction analysis. [Co(bppdca)(L)]·3H₂O is monoclinic with a space group of P2₁/c, 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, M_r=643.49, D_c=1.558 g/cm³, F(000)=1324, μ=0.766 mm^-1, S=1.051, the final R=0.0406 and wR=0.1160. The crystal structure analysis indicates that the Co(Ⅱ) cation is six-coordinated by two nitrogen atoms from two bppdca ligands, one monodentate O atom and one S atom from one L anion, two chelating O atoms from another L anion. The adjacent Co(Ⅱ) ions are linked by L anions to form one-dimensional helical chain [Co(L)]_n and the chains are further connected by pairs of bppdca ligands to generate a two-dimensional network. Finally, the networks are linked by hydrogen bonding to form a three-dimensional supramolecular framework. Moreover, the thermal stability, electrochemical property, photoluminescence property and selective photocatalytic activity of the title compound are investigated. CCDC:1010786