Synthesis, Crystal Structure and Fluorescence Properties of Cadmium Complexes of Pyridine-2-formaldehyde Hydrazone

Three complexes ,[Cd(HL)Cl-2](2) (1), [Cd(HL)(2)Br-2] (2) and [Cd(HL)I-2] (3) (HL=2-(4-chlorophenoxy)-N'-(pyridin-2-ylmethylene)acetohydrazide), were synthesized using a common solution method. The crystal structure and properties were studied by X-ray single crystal diffraction, infrared spectrum, ultraviolet spectrum, fluorescence spectrum and thermogravimetric analysis. The analysis of single crysial diffraction structure shows that complex 1 belongs to monoclinic system, C2Ic space group, and is a diner bridged by chlorine ions. Complex 2 belongs to monoclinic system, P2(1)/c space group. It is a butterfly shaped mononuclear molecule containing two organic ligands. The central Cd2+ ions of complexes 1 and 2 are in a distorted octahedral position. Complex 3 belongs to triclinic system, P (1) over bar space group, in which there is only one organic ligand. The coordination polyhedron of Cd2+ ion of complex 3 is distorted trigonal bipyramid. Solid fluorescence analysis showed that both ligand and complexes had strong fluorescence and emitted green light.