Synthesis and spectra analysis of terbium(III)complexes

Three types of terbium complexes were synthesized by introducing benzoylacetone as the first ligand and 1,10-phenanthroline,triphenylphosphine oxide,2,2’-dipyridyl as the second ligand,respectively.The structures of above materials were identified by infrared absorption spectra and chemical elemental analysis,and their light mechanism was studied by detail analysis of ultraviolet-visible absorption spectra and fluorescence spectra.The research results indicated that terbium complexes absorb energy by the first ligand when excited,and emit green light owing to 5 D4→7F4electron transition of terbium ion immediately;it is suggested that the fluorescence yield of terbium complexes doesn’t only depend on the energy difference between the singlet excita-tion state of the first ligand and the triple excitation state of second ligand,but the energy difference between the triple excitation state of the second ligand and the 5 D4energy state of terbium ion.