Raman spectrum of lanthanum ethyl sulphate nonahydrate

Abstract

Raman spectrum of a single crystal of lanthanum ethyl sulphate has been recorded for the first time using the λ 2537 radiation Forty-one lines have been identified out of which eight belong to the lattice oscillations, seven to the internal vibrations of the water molecule and the remaining twenty-six to the internal vibrations of the ethyl sulphate group. The Raman spectrum of ethyl sulphate (liquid) has also been recorded using the λ 4358 excitation and is compared with the spectrum of lanthanum ethyl sulphate. Thirty Raman lines could be identified in the spectrum of ethyl sulphate, of which fourteen are recorded for the first time. Probable assignments of the observed frequencies are also given. The sulphate group is found to have O-SO₃ structure in lanthanum ethyl sulphate, while it has a co-ordination (Mathematical expression: ν=22959.9+381.0(ν'+1/2)-3.0(ν'+1/2)²+0.1(ν'+1/2)³-512.0(ν"+1/2)+2.1) in ethyl sulphate.