基于刚性四面体含硅配体构筑的两个钴配位聚合物及其结构多样性(英文)

Structural Diversity of Coordination Polymers Built from a Rigid Silicon-Based Tetracarboxylate Linker

基于四齿刚性羧酸配体H4L(H4L=4,4′,4″,4′′′-silanetetrayltetrabenzoic acid)在水热条件下合成了2个微孔配位聚合物,分别是[Co L][NH2(CH3)2]2·2.25H2O(1)和[Co3L2]H3O]2·4DMA(2)(DMA=N,N-二甲基乙酰胺)。晶体结构分析表明这2个化合物均属于正交晶系,晶体1的空间群是Pbca,晶胞参数是a=2.270 2(2)nm,b=1.456 5(7)nm,c=2.826 4(7)nm,晶体2的空间群是Pnna,晶胞参数是a=2.698 2(3)nm,b=2.188 2(2)nm,c=1.382 1(9)nm。化合物1是由四面体型的单核钴和4-连接的配体构成的sra拓扑的三维结构。化合物2是由三核钴{Co3(COO)8}和4-连接的四面体型配体构成的、带有一维孔道的双节点(4,8)-连接的alb三维网络结构。讨论了由H4L构成的配位聚合物的结构多样性。

By using a rigid tetrapodal carboxylate linker 4,4′,4″,4′′′-silanetetrayltetrabenzoic acid（H4L）, two open-framework coordination polymers, namely, [Co L] [NH2（CH3）2]2·2.25H2O（1） and [Co3L2]H3O]2·4DMA（2）（DMA =N, N-Dimethylacetamide）, were solvothermally synthesized and structurally characterized. The crystal structure analyses indicate that both compounds crystallize in orthorhombic system. The unit cell parameters for compound 1 are space group Pbca, a=2.270 2（2） nm, b=1.456 5（7） nm, c=2.826 4（7） nm, and for compound 2, space group Pnna, a=2.698 2（3） nm, b=2.188 2（2） nm, c=1.382 1（9） nm. Compound 1 is a 3D framework built on tetrahedral Co units and a 4-connecting ligand L to give a 4-connected sra structure. Compound 2 is a 3D 2-nodal（4,8）-connected alb network with small 1D channels built from a trinuclear {Co3（COO）8} unit and a 4-connected tetrahedral L ligand. The structure diversity of H4L-based MOFs is discussed. CCDC： 1011878, 1; 1011879, 2.