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The infrared and Raman spectra for the three alkali-metal nitrates LiNo3, NaNO3, and KNO3 have been measured in the region from 1600 to 30 wavenumbers, and a normal-coordinate analysis has been made for these compounds with a special emphasis on the rotational and translational lattice modes in the crystal. All three compounds were studied as D3d6 models and a modified Urey–Bradley force field was used in the calculations. The intramolecular and interaction force constants for all three nitrates are given. The effect of the interaction potential constants on the NO3− ion is discussed as well as the effect of the metal ion–nitrate ionic interaction in the crystal from a comparison of the calculated force constants. Although there are large changes in the rotational and translational lattice frequencies when comparing one alkali-metal nitrate with another, the lack of force constant dependence is interesting.

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Infrared absorption curves have been obtained in the 2-15 µ region for a series of metal chelates of 2-(2-pyridyl)-and 2-(o-hydroxyphenyl) -derivatives of benzimidazole, imidazoline, benzoxazole and benzothiazole. Use was made of the potassium bromide pressed pellet technique for the preparation of samples. Particular attention has been focussed on the 3 µ region in order to observe the effects of coordination on the N-H stretching frequency. Coordination of the reagent with a metal ion decreases the N-H stretching frequency. This is explained in terms of resonance structures.Evidence is given for an intramolecular chelate structure in 2-( o-hydroxyphenyl) -benzimidazole. 2-(o-Hydroxyphenyl) -benzoxazole and its chelates have an absorption band at 8.0 µ (1250 kayser) which undergoes a regular shift, paralleling the usual stability order of the metals. The copper(II) chelate is at the highest frequency.

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