The effect of the conformation of flexible carboxylate ligands on the structures of metal–organic supramolecules
作者:Fangna Dai、Shuwen Gong、Peipei Cui、Guoqing Zhang、Xiaoliang Qiu、Fei Ye、Daofeng Sun、Zhijian Pang、Lei Zhang、Guilin Dong、Changqiao Zhang
DOI:10.1039/c0nj00328j
日期:——
Three flexible bent dicarboxylate ligands, 2,2â²-(2,3,5,6-tetramethyl-1,4-phenylene)bis(methylene)bis(sulfanediyl)dibenzoic acid (H2L1), 2,2â²-(1,4-phenylenebis(methylene))bis(sulfanediyl)dibenzoic acid (H2L9) and 2,2â²-(2,3,5,6-tetramethyl-1,4-phenylene)bis(methylene)bis(oxy)dibenzoic acid (H2L10), have been designed and synthesized. The positions of the functional substituents are in 1,4-positions of the central benzene ring, and all the ligands can adopt syn and anti conformations. By applying these flexible ligands to assemble with thulium ions or zinc ions, three metalâorganic supramolecules with metallamacrocycles or 1D chains have been isolated. L1 adopts a syn conformation in complex 1, leading to a 0D metallamacrocycle, L9 in complex 2 adopts an anti conformation to form a 1D ârainbow-likeâ chain while L10 in complex 3 adopts both syn and anti conformations. L10 in a syn conformation connects Zn4(OH)2(CO2)4 SBU to form a 0D metallamacrocycle, which is further connected by the ligand in an anti conformation to generate a 1D coordination polymer.
三个柔性弯曲二羧酸配体,2,2‐(2,3,5,6-四甲基-1,4-亚苯基)双(亚甲基)双(硫烷二基)二苯甲酸(H2L1)、2,2‐( 1,4-亚苯基双(亚甲基))双(硫烷二基)二苯甲酸(H2L9)和2,2-(2,3,5,6-四甲基-1,4-亚苯基)双(亚甲基)双(氧基)二苯甲酸(H2L10)已被设计和合成。功能取代基的位置在中心苯环的1,4位,所有配体均可采用顺式和反式构象。通过应用这些柔性配体与铥离子或锌离子组装,分离出三种具有金属大环或一维链的金属有机超分子。配合物1中的L1采用顺式构象,形成0D金属大环,配合物2中的L9采用反式构象形成一维“彩虹状”链,而配合物3中的L10同时采用顺式和反式构象。顺式构象的L10与Zn4(OH)2(CO2)4 SBU连接形成0D金属大环,进一步通过反式构象的配体连接生成1D配位聚合物。