VIBRONIC SPECTRA OF EUROPIUM COMPOUNDS CONTAINING DERIVATIVES OF 1,10-PHENANTHROLINE

Luminescence and excitation of luminescence vibronic spectra of europi um beta-diketonates: acetates and nitrates with 1,10-phenanthroline an d its derivatives were studied. The influence of the donor-acceptor pr operties and of size of ligands on Stark splitting of electronic trans itions and on intensity distribution in vibronic sidebands was investi gated. An increase of acceptor properties of one ligand of the compoun d is equivalent to increase of the donor properties of the other ligan d as far as their influence on Eu3+ spectra are concerned. Resonant vi bronic effect was studied. Complex case of resonant vibronic interacti on with participation of several Vibrations of both ligands under cond itions of simultaneously low and strong nonadiabaticity is presented. (C) 1998 Elsevier Science B.V. All rights reserved.