New complexes of europium and gadolinium with 2,4,6-trichlorophenyl acetoacetate as ligand

►The emission quantum efficiency (η) of the 5D0 level of the europium ion in the [Eu(TCA)2(H2O)5](OH) complex was η = 45%. ►The intensity parameters (Ωλ) and the nepheleuxetic effect corroborate the strong dependence of the theoretical models with the polarization of the chemical environment in the complexes. ►These results suggest these complexes as potential candidates as useful markers.