具有（3,4-）连接（3·7~2）（3·7~3·8~2）拓扑结构的二维配位聚合物{[Cu_2（dhbd）_2·2H_2O]·4H_2O}_n

Two-Dimensional Coordination Polymer {[Cu_2（dhbd）_2·2H_2O]·4H_2O}_n with（3,4-）connectivity （3·7~2）（3·7~3·8~2） Topology Structure

采用水热法合成了标题配位超分子聚合物{[Cu2(dhbd)2.2H2O].4H2O}n(其中H4dhbd=2,3-二羟基丁二酸),通过元素分析、X-射线单晶衍射、红外光谱等技术对其进行了表征。配合物属单斜晶系,空间群P21;晶胞参数:a=0.8 373(5)nm,b=0.8 768(5)nm,c=1.2 139(7)nm;α=90°,β=104.516(10)°,γ=90°;z=4,Dc=2.045 mg.m-3,μ=2.561 mm-1,F(000)=540;最终偏离因子R=0.0 227,ωR=0.636。配合物的基本构建基元包含2个铜(Ⅱ)离子,2个2,3-二羟基丁二酸根,2个配位H2O分子和4个晶格H2O分子。配合物中,2,3-二羟基丁二酸根与Cu(Ⅱ)配位,沿着21轴方向形成一维螺旋链,进而又通过桥联作用扩展为具有(3.72)(3.73.82)拓扑结构的二维层,毗邻的二维层籍(O…H?O)氢键相互作用进一步拓展为三维超分子结构。

The title complex [Cu2（dhbd）2·2H2O]·4H2O（H4dhbd=2,3-dihydroxybutanedioic acid） has been hydrothermally synthesized and characterized by means of elemental analysis,single crystal X-ray diffraction,IR.The results show that the complex is monoclinic,with space group P21,a=0.8 373（5）nm,b=0.8 768（5）nm,c=1.2 139（7）nm,α = 90°,β=104.5 160（10）°,γ= 90°;z =4,Dc=2.045 mg·m-3,μ= 2.561 mm-1,F（000） =540;R=0.0 227,wR=0.636.The crystal structure of complex consists of two copper（Ⅱ） ions ,two dhbd ligand,two coordinated water molecules and four lattice water molecules. In the complex, Cu（ Ⅱ ） are coordinated by dhbd ligand froms a 1 - D helical chain along the 21 axis, which in turn through the bridging role in the expansion as a （3 · 7^2 ） （3 · 7^3 · 8^2 ） topology of the 2 ＇ D layer, and the adjacent 2 - D layer origin （ O…H - O） hydrogen bond interaction to further extended to 3 -D supramolecular structure.