Dinuclear Eu(III) complexes with macrocyclic tetraphosphine tetraoxide ligand and their photoluminescence properties

摘要： Dinuclear Eu(III) complexes with macrocyclic tetraphosphine tetraoxide ligand (1, 5, 9, 13-Tetraphosphacyclohexadecane-1, 5, 9, 13-tetraphenyl-1, 5, 9, 13-tetraoxide) that keep the Eu(III) ions apart were synthesized and their photoluminescence properties were investigated. It was found that quantum yield of Eu(III) complex 2 in ethyl acetate was excellent (? =0.54) even at a large concentration (1×10?3 mol/l) and strong photoluminescence was obtained. Macrocyclic TPTO ligand has a function of a “separator” of Eu(III) ions that prevents concentration quenching in the Eu(III) complexes.