SYNTHESIS AND LUMINESCENCE STUDY OF EUROPIUM COMPLEXES WITH 5,5-DIMETHYL-2,4-HEXANEDIONE AND VARIOUS ORGANIC-BASES

A series of europium(III) complexes with 5,5-dimethyl-2,4-hexanedione and various organic bases. Eu(But-ac)2OH and Eu(But-ac)3 . B, where But-ac = 5.5-dimethyl-2,4-hexanedionate, and B = 1,10-phenanthroline, 2,2'-bipyridine or 5-nitro-1,10-phenanthroline, were synthesized and characterized by elemental analysis, UV and IR spectroscopy and melting point data. IR data confirmed that the europium is coordinated via oxygen donor atoms to 5,5-dimethyl-2,4-hexanedione and via nitrogen donor atoms to the diimine bases. The Eu(But-ac)2OH complex appears to be polymeric. Luminescence spectra, lifetime and quenching studies are reported.