STRUCTURAL AND PHOTOPHYSICAL PROPERTIES OF EUROPIUM(III) MIXED COMPLEXES WITH BETA-DIKETONATES AND O-PHENANTHROLINE

The luminescence of solid samples of europium mixed complexes with beta-diketonates and o-phenanthroline (Phen), EuL3Phen, is investigated at 77 K in order to probe the structure of these compounds. A ligand-to-metal energy transfer process is evidenced. The quantum yields of 10(-5) M solutions in CH2Cl2 are measured relative to 9,10-dichloroanthracene. Except for benzylacetonate, these yields are quite low, due to the presence of low-lying electronic states of the ligands. The crystal structure of Eu(NO3)(DBM)2(TBPO)2 as well as its photophysical properties in CH2Cl2 solution are presented.