Infrared Absorption Spectra of Water of Crystallization in Copper Sulfate Penta- and Monohydrate Crystals

Abstract

The observed spectra of water in the penta-and monohydrate crystals were interpreted by the effects of coordination copper-water and hydrogen bonding O-H…O. The whole difference in the spectra of the two crystals were explained in relation to the escape of the four ligand water molecules and the resulting rearrangement of atoms. The stretching, bending and rocking modes, which are single in the case of the pentahydrate, split into doublets in the monohydrate. This result was explained by a single assumption of strong coupling of two neighboring water molecules in the latter.