Luminescence and crystal field analysis of Eu 3+ in Eu[Co(CN) 6]·4H 2O

Abstract

The vibrational spectra of Eu[Co(CN) 6]·4H 2O and luminescence spectra of Eu 3+ in this compound, using 355 nm excitation at temperatures down to 10 K, have been assigned. A clear distinction is made between the n=5 and 4 members of the Ln[M(CN) 6]· nH 2O series from the vibrational spectra. The electronic spectra show prominent vibronic structures, particularly for the 5D 0→ 7F 2 sideband. A resonance occurs between the transitions 5D 0→ 7F 1(III) and 5D 0→ 7F 0+ ν(Eu−N). A crystal field analysis of the derived energy data set is presented for Eu 3+ in eight coordination geometry.