The effect of the conformation of flexible carboxylate ligands on the structures of metal–organic supramolecules

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

The effect of the conformation of flexible carboxylate ligands on the structures of metal–organic supramolecules†‡

Fangna Dai,^a Shuwen Gong,^b Peipei Cui,^a Guoqing Zhang,^a Xiaoliang Qiu,^a Fei Ye,^a Daofeng Sun,*^a Zhijian Pang,^a Lei Zhang,^a Guilin Dong^a and Changqiao Zhang*^a

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* Corresponding authors

^a Key Lab for Colloid and Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University, Jinan 250100, P. R. China
E-mail: dfsun@sdu.edu.cn, zhangchqiao@sdu.edu.cn
Fax: +86 53188364218
Tel: +86 53188364218

^b Department of Chemistry, Liaocheng University, Liaocheng, P. R. China

Abstract

Three flexible bent dicarboxylate ligands, 2,2′-(2,3,5,6-tetramethyl-1,4-phenylene)bis(methylene)bis(sulfanediyl)dibenzoic acid (H₂L¹), 2,2′-(1,4-phenylenebis(methylene))bis(sulfanediyl)dibenzoic acid (H₂L⁹) and 2,2′-(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 metal–organic 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 “rainbow-like” 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.

This article is part of the themed collection: Coordination polymers: structure and function

New Journal of Chemistry

The effect of the conformation of flexible carboxylate ligands on the structures of metal–organic supramolecules†‡

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The effect of the conformation of flexible carboxylate ligands on the structures of metal–organic supramolecules

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