Alteration of molecular conformations and spectral properties for nickel(II), zinc(II) and copper(II) complexes having 3,8-di(thiophen-2′,2′′-yl)-1,10-phenanthroline ligands
作者:Bin Hu、Feng Xu、Shujun Fu、Tao Tao、Yangnian Wang、Wei Huang
DOI:10.1016/j.ica.2009.12.055
日期:2010.4
Four transition metal complexes of 3,8-di(thiophen-2',2 ''-yl)-1,10-phenanthroline (dtphen), formulated as [Ni(dtphen)(2)(H(2)O)(2)]center dot(ClO(4))(2) (1), [Zn(dtphen)(2)(H(2)O)]center dot(ClO(4))(2) (2) [Cu(dtphen)(2)(H(2)O)]center dot(ClO(4))(2) (3), [Cu(dtphen)(phen)(2)]center dot(ClO(4))(2) (4) (phen = 1,10-phenanthroline) with different metal-to-ligand ratios, were synthesized and characterized herein. The X-ray single-crystal diffraction studies of 1-4 exhibit that different molecular configurations for the dtphen ligand can be observed where the side thiophene rings adopt the trans/trans, trans/cis, trans/disorder and cis/cis conformations relative to the central 1,10-phenanthroline unit in different compounds. Fluorescence emission spectra of 1-4 in methanol show that the fluorescence emission of 2 is much stronger than the other three metal complexes, which is mainly due to its full d(10) electronic configuration of Zn(II) ion. (C) 2010 Elsevier B.V. All rights reserved.