Raman spectra of mercury(I) and mercury(II) iodides in the solid state

Abstract

The Raman spectrum of yellow Hg₂I₂ contains features at 110 and 192 cm^-l assignable to Hg-Hg stretching and Hg^-1 stretching respectively. The spectrum of yellow HgI₂ at c. 150º shows bands at 33 cm^-1 (I-Hg^-1 bending) and 133 cm^-1 (Hg-I stretching). The Raman shifts for red HgI₂ are 24, 111, and 137 cm_-l, attributable to I-Hg^-1 bending, symmetric and asymmetric Hg^-1 stretching respectively. Assignments are made on the basis of factor group analyses on the Bravais unit cells. Some force constants are calculated.