The vibrational spectra of SO2−4 ion in the hydrated double sulphates: The tutton salts
Review articleOpen access
Abstract:

AbstractThe infrared spectra of ten double sulphates, viz., M′2M″(SO4)2 6H2O (M′  NH4/K; M″  Ni, Co, Fe, Cu, Zn and Mn) have been recorded in the 1300–400 cm−1 region and the vibrational spectra of SO2−4 ion in these salts compared. Spectroscopic observations are correlated with the known SO bond lengths in these salts. The spectrum of the KCu salt is distinct from that of the others and the existence of two types of SO2−4 ions in this salt is suggested. In all the salts, the SO2−4 ion exhibits linear as well as angular distortion from its free-state tetrahedral symmetry. The linear distortion is, however, greatest in the Mn salt, consistent with known crystal structure data.

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