Hydrogen Bonding in the Calcium Phosphates

Abstract

To account for calcium deficiencies in synthetic hydroxyapatites, the concept of hydrogen bonding between oxygens of adjacent orthophosphate groups was introduced1. In support of this concept, infra-red evidence showed a linear relationship between the absorbance of the hydrogen-bonded O–H stretching frequency at 3,400 cm.−1 and the Ca/P ratio of several synthetic hydroxyapatites2. Recently, Winand et al. offered a different interpretation of the infra-red data3. The following is in answer to their comments.

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STUTMAN, J., POSNER, A. & LIPPINCOTT, E. Hydrogen Bonding in the Calcium Phosphates. Nature 193, 368–369 (1962). https://doi.org/10.1038/193368a0

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