pH-Dependent two novel heteronuclear Cu(II)/Sr(II) coordination polymers constructed from 1,3,5-benzenetricarboxylic acid: Synthesis, crystal structures and properties

摘要

Two novel heteronuclear coordination polymers, namely, [CuSr2(BTC)(2)]center dot 10H(2)O (1) and [Cu2Sr(H(4)TMA)(2)]center dot 4H(2)O (2) (H3BTC = 1,3,5-benzenetricarboxylic acid, H(4)TMA = 2-hydroxytrimesic acid) were hydrothermally synthesized as pH-dependent products and characterized by elemental analysis (EA), infrared spectroscopy (IR) and single crystal X-ray diffraction. For compound 1, it displays a 3D structure with (2,5,6)-connected net topology. For 2, the H3BTC ligand is oxidized into H4TMA and compound 2 features a 2D layer structure, which is further linked by Cu center dot center dot center dot Cu and Cu center dot center dot center dot O supramolecular interactions into a 3D structure. The results show that the pH plays a crucial role in determining the structure of the compounds. In addition, thermalgravimetric analysis of compounds 1-2 and luminescence property of 1 are also investigated. (C) 2015 Elsevier B.V. All rights reserved.