Infrared absorption spectra of aquo complexes and the nature of co-ordination bonds

All known intermolecular Raman bands of water, viz., the hydrogen‐bond bending and stretching bands, and the librational bands, decrease rapidly in intensity with temperature rise. In contrast, the librational intensities of water in electrolyte solutions exhibit very small variations with temperature. The intensity decreases observed for pure water indicate that hydrogen bonds are broken by increase of temperature, but the near constancy observed for solutions indicates that primary hydration is not greatly affected, even at temperatures near the normal boiling points of some of the solutions studied.Integrated Raman intensities of the hydrogen‐bond‐stretching vibrations of pure water at 152–175 cm−1 were redetermined in the temperature range of −6.0° to 94.7°C. The new intensity data, which are more accurate than the old [cf., J. Chem. Phys. 40, 3249 (1964)], yield the values ΔH°=5.6 kcal/mole and ΔS°≈19 cal/deg·mole for the process B→U, where B refers to water molecules which contribute intensity to th...

Raman Spectral Studies of the Effects of Temperature on Water and Electrolyte Solutions

The Vibrations of Protons in Minerals: hydroxyl, water and ammonium

Spectral comparison of heavily hydrated salts with disrupted terrains on Europa

The infrared spectra from 4000 to 70 cm−1 of several hydrated and anhydrous salts of transition metals have been obtained. A comparison of the spectra of a hydrate with a full coordination shell of water, of a lower hydrate, and of the anhydrous salt is made. Differences in the spectra are discussed.

Jan van der Elsken

Papers

The librational spectra of water and heavy water in crystalline salt hydrates