Syntheses, structures and fluorescence of two coordination complexes of Zn(ii) and 1,3-bis(2-methylimidazolyl)propane: solvent effect

Abstract

Two Zn(II) coordination complexes, formulated as [Zn₂(bmip)(tpa)₂·2DMF]_n (1) and [Zn(bmip)(tpa)·3H₂O]_n (2) (bmip = 1,3-bis(2-methylimidazolyl)propane, H₂tpa = terephthalic acid, DMF = N,N-dimethylformamide) have been prepared by ultrasonic reactions of the flexible ligand bmip and aromatic dicarboxylic acid H₂tpa with Zn(II) ions in various solvent systems. Both of these complexes have been characterized by elemental analyses, IR spectra, and single-crystal X-ray diffraction. As controlled by solvent systems, complex 1 is a 2-fold interpenetrating 3D framework with α-Po network topology, while, complex 2 reveals a 3-fold interpenetrating 3D framework with dia topology. Furthermore, the photoluminescence at room temperature and thermogravimetric properties of the complexes 1 and 2 were also investigated in the solid state.