Solutes in sulphuric acid. Part VI. A nuclear magnetic resonance study of organic sulphonic acids and 1H nuclear magnetic resonance standards; pK BH determination of sulphonic acids
- 1 January 1975
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 3,p. 226-229
- https://doi.org/10.1039/p29750000226
Abstract
The behaviour of some alkane- and arene-sulphonic acids in sulphuric acid as solvent has been investigated. In aqueous sulphuric acid the sulphonic acids ionize: ArSO3H ArSO3 –+ H+. The ionization follows the H0 a acidity function and half-ionization is observed at –5·8 > Ho a > –6·8. In fuming sulphuric acid the sulphonic acids exhibit both protonation and sulphur trioxide complexation with formation of RSO3H2 + and RS2O6H respectively. The chemical shifts of some 1H n.m.r. standards for the sulphuric acid system are reported. The preferred standards are the (CH3)4N+ ion as internal standard, and neat liquid tetramethylsilane as external standard.Keywords
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