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

Two novel heteronuclear coordination polymers, namely, [CuSr 2 (BTC) 2 ]·10H 2 O ( 1 ) and [Cu 2 Sr(H 4 TMA) 2 ]·4H 2 O ( 2 ) (H 3 BTC = 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 H 3 BTC ligand is oxidized into H 4 TMA and compound 2 features a 2D layer structure, which is further linked by Cu⋯Cu and Cu⋯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. [ABSTRACT FROM AUTHOR]