Interpretation of the Infrared Spectrum of Boehmite

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Abstract
The infrared-absorption spectrum of the mineral boehmite is interpreted in terms of the normal modes of a linear zigzag chain of OH— groups. The results of deuteration experiments confirming this interpretation are described. Hydrogen bond lengths, determined from the infrared spectrum, are used to evaluate available x-ray measurements. Bond angles, calculated on the basis of the zigzag chain model, are in general agreement with x-ray results. The extreme sensitivity of the infrared spectrum of this compound to small changes in hydrogen bond length, as might be caused by compositional variations, is discussed.

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