Lattice vibrations in M(CH3COO)2 · 4H2O/D2O, M = Mg, Co, and Ni

Infrared and Raman spectra in the region 450–40 cm −1 are reported for the compounds M (CH 3 COO) 2 · 4H 2 O, M = Mg, Co, and Ni and their deuterates at temperatures 300 and 95 K (130 K for Raman). The observed bands are assigned in the light of known crystal data and group theoretical analysis. It is shown that translations of H 2 O, CH 3 COO − , and M 2+ can be treated as internal vibrations of M O 6 complex having symmetry D 4 h .