Luminescence and crystal field analysis of Eu3+ in Eu[Co(CN)6]·4H2O

The vibrational spectra of Eu[Co(CN)6]·4H2O and luminescence spectra of Eu3+ 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]·nH2O series from the vibrational spectra. The electronic spectra show prominent vibronic structures, particularly for the 5D0→7F2 sideband. A resonance occurs between the transitions 5D0→7F1(III) and 5D0→7F0+ν(Eu−N). A crystal field analysis of the derived energy data set is presented for Eu3+ in eight coordination geometry.