Intramolecular energy transfer models and energy band characteristic of rare-earth complexes with o-phthalic acid

In this study, ternary and binary europium complexes of o-phthalic acid are synthesized. Their compositions are characterized by element analysis and IR spectra and ascertained to be Eu2(o-phthalic)34(H2O) and Eu2(o-phthalic)3(phen)22(H2O), respectively. The UV–Vis spectrum and photoluminescence spectra are also analyzed. Meanwhile, the energy transfer models have been set up and structure of energy band and optical gap of the ternary complex powder were obtained by the UV–Vis spectrum.