The Infrared Spectra and Structure of LiOH, LiOH·H2O and the Deuterium Species. Remark on Fundamental Frequency of OH-

Abstract

The infrared spectrum of a thin path of solid LiOH and LiOH·H₂O (undeuterated, partially deuterated, and completely deuterated) has been observed. The spectra indicate that both hydrogens from each water molecule are used to form strong hydrogen bonds in the hydrate. The results serve to substantiate the crystal structures previously determined by x‐ray diffraction. For LiOH the absorption maximum occurs at 3678±1 cm^‐1; the fundamental frequency of OH^‐ in LiOH is 3839±10 cm^‐1. The spectrum of LiOH·HDO exhibits an anomaly in the bending frequency of HDO.