Single crystal Raman spectra of SbI3·3S8; CHI3·3S8 and AsI3·3S8

Abstract Single crystal Raman spectra of the addition compounds RI3·3S8 (R = Sb, CH and As) have been reported for the first time. No single crystal X-ray work has been done for AsI3·3S8, but all three compounds exhibit similar spectra indicating that AsI3·3S8 also crystallizes in the same form. Vibrational modes of the constituent molecules have been observed and discussed in terms of factor group fundamentals. The assignments seem to substantiate previous work on sulphur. All the lattice modes as predicted by group theory have been observed.