Raman Spectroscopic Study on the Coordination Behavior of Rare Earth Ions in N-Methylacetamide

摘要

The coordination behavior of rare earth(Ln~(3+))ions in N-methylacetamide(NMA)solution has been investigated at room temperature by Raman spectroscopy.The behavior of the symmetric Raman Ln-Cl stretching(v_(Ln-Cl))band,and amide I(V_(AI)),and III(V_(AIII))bands of NMA with the rare earth series is discussed in conjunction with the change in the coordination structure occurring in the middle of the rare earth series.A competition for a coordination equilibria between a Cl~-ion and an NMA molecule from the rare earth chloride-NMA complex might occur in the middle rare earth region.It is demonstrated that the change in the coordination structure of Ln~(3+)ions in NMA is due to an elimination of an NMA molecule.