Abstract
THE hexuronic acids of polyuronides such as the alginates and chondroitin sulphates vary in their acid dissociation constants (pKa) and in their abilities to react with periodate1. Both phenomena could be explained by the formation of a hydrogen bond between the carboxylate group and a hydroxyl group at C2 or C3 of the uronic acid1. Hanrahan2 inferred that the increase in frequency (ν) of the antisymmetric stretching vibration of the ionized carboxylate group in the mono-ions of dicarboxylic acids is due to the formation of CO−2 … HO hydrogen bonds. A similar increase in ν was found by Nakamoto3 when the carboxylate group underwent monodentate coordination by metal ions.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Scott, J. E., Histochemie (in the press).
Hanrahan, E. S., Spectrochim. Acta, 22, 1243 (1966).
Nakamoto, K., Infra-red Spectra of Inorganic and Co-ordination Compounds, 198, 203 (John Wiley and Sons, New York, 1963).
Goulden, J. D. S., Spectrochim. Acta, 6, 129 (1954).
Chapman, D., J. Chem. Soc., 550 (1964).
Robinson, R. A., and Stokes, R. H., Electrolyte Solutions (Butterworths, London, 1959).
Stability Constants of Metal-Ion Complexes (Chemical Society, London, 1964).
Spinner, E., J. Chem. Soc., 4217 (1964).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
GOULDEN, J., SCOTT, J. Infrared Frequency and Dissociation Constant of the Carboxylate Group. Nature 220, 698–699 (1968). https://doi.org/10.1038/220698a0
Received:
Issue Date:
DOI: https://doi.org/10.1038/220698a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.