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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References
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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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DOI: https://doi.org/10.1038/193368a0
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