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

Two Zn(II) coordination complexes, formulated as [Zn-2(bmip)(tpa)(2)center dot 2DMF](n) (1) and [Zn(bmip)(tpa)center dot 3H(2)O](n) (2) (bmip = 1,3-bis(2-methylimidazolyl)propane, H(2)tpa = terephthalic acid, DMF = N,N-dimethylformamide) have been prepared by ultrasonic reactions of the flexible ligand bmip and aromatic dicarboxylic acid H(2)tpa 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 alpha-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.