Mossbauer spectra of Eu(III) and Gd(III) complexes of phosphine oxides with chelating perchlorate

摘要

The reaction of Ln(ClO_4)_3·nH_2O with triphenylphosphine oxide (TPPO) in methanol has led to the formation of [Ln(ClO_4)_2(tppo)_4]ClO_4·MeOH (Ln=Nd, Eu, Gd, Dy, Yb), in which the perchlorate anion acts as a symmetric bidentate. The emission spectra of Eu(III)-TPPO complexes, showing enhancement in theintensity due to the phenyl group, indicate an isotropic electron distribution for thenitrato complex [Eu(NO_3)_3(tppo)_2(EtOH)]. ~(151)Eu and ~(155)Gd Mossbauer spectra ofthe TPPO complexes also lead to the same conclusion.