Preparation, Characterization and Theoretical Calculation of a Cadmium Complex of 3-hydroxy-2-methylquinolin-4- carboxylate and 1,10-phenanthroline

A novel organic-inorganic hybrid metal cadmium complex [Cd (MCA)2(Phen)(H2O)] (MCA = 3-hydroxyquinoline-4-carboxylic acid anion; Phen = 1,10-phenanthroline) was synthesized by solvothermal method and characterized by single crystal X-ray diffraction. The title complex exhibits a two-dimensional structure through hydrogen bonding and π···π packing interactions. Solid state photoluminescence spectra show that they exhibit red emission bands at 616 nm, and time-dependent density functional theory calculations show that they are ligand-to-ligand charge transfers. Solid diffuse reflection spectra show that the energy band gap of the complex is 2.32 eV.