Gas phase proton affinities of carbonyl compounds by ion cyclotron resonance spectroscopy
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 69, 1023-1027
- https://doi.org/10.1039/f29736901023
Abstract
Pressure studies and the double resonance technique of ion cyclotron resonance spectroscopy have been used to establish the following orders of proton affinities for carbonyl compounds in the gas phase: HCOOH < HCOOCH3 < CH3COOH < HCOOC2H5 < CH3COOCH3≈ CH3COCH3 < CH3COOC2H5; CH3COCH3 < CH3COC2H5 < C2H5COC2H5. The order of proton affinities in these compounds is shown to follow the decrease in ionisation potential of homologous compounds and the inductive effect of alkyl substituents. An ester and its corresponding thioester have been found to have approximately equal proton affinity.Keywords
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