柔性环己烷六酸和刚性草酸配体桥连的稀土配位聚合物的水热合成与结构研究

草酸铽与水合环己烷六酸(H6LⅠ.H2O)(顺式椅式构型LⅠ:a,e,a,e,a,e)在水热条件下反应生成一种新颖的三维稀土配位聚合物Tb4(LⅡ)(ox)3(H2O)8](LⅡ为反式椅式构型:e,e,e,e,e,e;ox为草酸根),通过元素分析和红外光谱对这个配位聚合物进行了表征。X射线单晶衍射分析表明该配合物属于三斜晶系,P1空间群,晶胞参数为:a=0.60203(4)nm,b=1.08278(8)nm,c=1.29446(9)nm,α=67.908 0(10)°,β=82.109 0(10)°,γ=83.887 0(10)°,V=0.773 07(9)nm3,Z=2。在这个配合物的形成中,顺式构型的H6LⅠ配体发生构型转变形成LⅡ配体,LⅡ配体采取μ8-桥连模式将Tb离子连接成一个具有孔洞的二维(Tb-LⅡ)配位层。由μ2-和μ4-桥连模式构成的一维(Tb-ox)链将二维(Tb-LⅡ)层连接成一个具有孔道的三维配位框架,ox配体和水分子通过配位作用和氢键作用填充在孔道中。

Hydrothermal Synthesis and Crystal Structure of a Novel Lanthanide Coordination Polymer Bridged by Flexible Cyclohexane-1,2,3,4,5,6-hexacarboxylate and Rigid Oxalate Ligands

Reaction of Tb2(ox)3·6H20 and cyclohexane-1,2,3,4,5,6-hexacarboxylic acid hydrate (H6LⅠ. H2O) (cischair conformation LⅠ: a,e,a,e,a,e) resulted in formation of a novel three-dimensional lanthanide coordination polymer Tb4(L Ⅱ)(ox)3(H2O)8] (trans-chair conformation LⅡ: e,e,e,e,e,e; ox: oxalate) under hydrothermal condition,which was characterized by elemental analysis and IR. X-ray diffraction crystal structure analysis shows that the complex crystallizes in triclinic system, space group P-1 with a=0.602 03(4) nm, b=1.082 78(8) nm, c=1.294 46(9)nm, α=67.908 0(10)°, β=82.109 0(10)°, γ=83.887 0(10)°, V=0.773 07(9) nm3, Z=2. In the formation of the complex,ox ligands and water molecules through coordination and hydrogen interactions.