Synthesis, characterization, and fluorescence properties of dinuclear cadmium(II) complexes

Abstract

Four dinuclear cadmium(II) complexes, [Cd 2 (L 1 )( 2 -Cl)Cl 2 ] (1), [Cd 2 (L 2 )( 2 -Cl)Cl 2 ] (2), [Cd 2 (L 3 )( 2 -Cl)Cl 2 ] (3), and [Cd 2 (L 4 ) 3 ClO 4 ] (4), where HL 1 ¼ 4-methyl-2,6-bis(1-(2-piperidinoethyl)iminomethyl)-phenol, HL 2 ¼ 4-methyl-2,6-bis(1-(2-pyrrolidinoethyl)iminomethyl)-phenol, HL 3 ¼ 4-methyl-2,6-bis(1-(2-morpholinoethyl)iminomethyl)-phenol and HL 4 ¼ 4-methyl-2,6-bis(cyclohexylmethyl)iminomethyl)-phenol, were synthesized. They were characterized by elemental analysis, FT-IR, UV-Vis, fluorescence and electronspray ionization mass spectroscopy. Complexes 1 and 4 were also characterized by single crystal X-ray analysis. The cadmiums atoms in 1 are linked by 2 -chloride in a distorted square pyramidal geometry, whereas cadmium atom in 4 is in a distorted octahedral environment. The complexes show emission bands around 500 nm with excitation at 395 nm.

Crystal structure of bis(μ2-thiocyanato-N,S)-bis(isothiocyanato)- bis[(2-morpholin-4-ylethyl)-(1-pyridin-2-ylethylidene)amine-N,N′,N″]- dicadmium(II), Cd2(NCS)4(C13H19N3O)2

“…The cadmium(II) complexes are widely investigated for their fluorescent properties [4][5][6]. The title crystal structure is built up of acentrosymmetric dimeric cadmium(II) complex.…”