Indium(III) hetero-ligand complexes containing 1,10-phenanthroline,chloride,acetonitrile and dimethyl sulfoxide: Crystal structure determination,and luminescent properties

Abstract

[In(Me₂phen)Cl₃(DMSO)]·DMSO complex (1) (Me₂phen is 5,6-dimethyl-1,10-phenanthroline and DMSO is dimethyl sulfoxide) and [In(Ph₂phen)Cl₃(CH₃CN)] complex (2) (Ph₂phen is 4,7-diphenyl-1,10-phenanthroline) were prepared from the reaction of 5,6-dimethyl-1,10-phenanthroline and 4,7-diphenyl-1,10-phenanthroline with InCl₃·4H₂O in methanol, respectively. Both complexes were characterized by IR, UV-Vis, NMR and luminescence spectroscopy and their structures were studied by the single-crystal diffraction method. In the crystal structure of complex 1, there are intra- and intermolecular C-H${\cdots}$Cl and C-H${\cdots}$O hydrogen bonds and π−π contacts. In complex 2, there are intermolecular C-H${\ldots}$Cl hydrogen bonds. The luminescence emission spectra of Me₂phen and 1, and Ph₂phen and 2, were obtained in DMSO and CH₃CN at room temperature, respectively. The shapes of the emission spectra for Me₂phen, Ph₂phen, 1 and 2 are similar but the luminescent emission of complexes of 1 and 2 are weaker than those of free Me₂phen and Ph₂phen ligands. There are red shifts of the emission energies of the Ph₂phen ligand after coordination to In(III) for complex 2.