Syntheses and Structures of Three Divalent Zn/Cd Metal–Organic Supramolecular Frameworks Constructed by 1, 2, 4-benzenetricarboxylate

Abstract

Three novel metal–organic hybrid compounds, [Zn(H2btc)2(H2O)2]·2H2O (1),[Cd(Hbtc) (H2O)]n (2) and [Zn3(btc)2(phen)2(H2O)2]n (3) (H3btc = 1,2,4- benzenetricarboxylate, phen = 1,10-phenanthroline), have been hydrothermally synthesized and their structures were determined by single-crystal X-ray diffraction. The structural motifs are multiforms from 0D, 3D, and 2D interpenetrating networks. It is found that the H3btc ligand exhibits multicoordinated modes. In these complexes, the carboxylates of btc and water molecules are involved in intermolecular hydrogen bondings to form the 3D molecular frameworks and reinforce the structural stability, which proves that noncovalent interactions like H-bond play an important role in instructing the supramolecular architectures.