摘要:
To assemble metal-organic coordination complexes, a flexible dicarboxylate ligand, 2,2'-(4,6-dimethyl-5-nitro-1,3-phenylene)bis(methylene)-bis-(sulfanediyl)dibenzoic acid (H2L), has been designed and synthesized. Using the flexible ligand to assemble with copper ions, a mixture of two metal-organic complexes, Cu-2(L)(2)(py)(4). 4-dmso (1) and Cu-2(L)(2)(py)(6)center dot 3dmso.py (2), has been generated by solvothermal technology in one glass tube. Through increasing the mole fraction of pyridine, the pure phase of complex 2 was obtained. Both complexes have been characterized by single-crystal X-ray diffraction, elemental analysis, and thermogravimetric analysis. Complex 1 is a discrete rectangular macrocycle. The guest solvents of dimethyl sulfoxide molecules were trapped in the cavity of rectangular metallmacrocycle, resulting in the formation of an infinite supramolecular metal-organic nanotube through van der Waals interactions between the guests and the host molecules. In complex 2, the flexible ligand adopts a syn conformation to assemble with copper ions to form an infinite one-dimensional zigzag chain. (C) 2012 Elsevier B.V. All rights reserved.