Structure and vibrational spectrum of OH ion in crystals of basic and amphoteric hydroxides

It has been established that the frequency nu OH of an isolated OH- ion is 150-200 cm-1 less than the values figuring in the experimental literature. The exact value nu/sub O/ OH- was obtained recently by the spectroscopic method and is 3555, 5932 cm-1. From the viewpoint of the authors of this survey, the mechanism of increasing the frequency nu OH in crystals of basic hydroxides consists of monotonic change in the hybridization of the orbitals of the oxygen atom (including the orbitals of unshared electron pairs) under the influence of the immediate environment and the electrostatic field of the crystal. The frequency nu OH is determined in the first place by the type of hybridization of the orbitals of the O atom and the degree of overlap of one of these orbitals with the 1s orbital of the H atom. It has been shown that the width of the bands of stretching OH vibrations is independent of the strength of the hydrogen bond. It has been demonstrated that the width of the nu OH band of the hydroxide association ...OH...OH... is determined by the time of its residence in a state with one of the alternative directions of the dipole moment