Spectra and details of the structure of europium acetates with derivativesof 1,10-phenanthroline

Luminescence, excitation of luminescence, IR and Raman spectra of europium acetates with 1,10-phenanthroline derivatives (Ph), Eu(CH3COO)(3). Ph, were studied. Crystal field parameters for model complexes were calculated. Som e conclusions about details of the structure of the compounds were obtained . It was shown that both steric hindrances due to ligand-ligand crowding an d donor-acceptor properties of the ligands are significant in creation of t he structure. Maximum inequivalence of Eu-O bonds in compound containing 5- nitro-phenanthroline with electrophilic NO2-group was noted as well as in c ompounds with 3,4,7,8-tetramethyl- and 5-phenyl-phenanthroline having bulky substituents. There is the strongest polarisation of the carboxyl groups i n these compounds. Nearly equalised Eu-O bonds were found in compound with 4,7-diphenyl-phenanthroline. Here a steric factor was minimised due to rota tion of phenyl radicals in relation to the phenanthroline nucleus. (C) 2001 Elsevier Science B.V. All rights reserved.