1H and 13C nuclear magnetic resonance relaxation-time studies of ionophoric calixarene esters
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 5,p. 793-797
- https://doi.org/10.1039/p29910000793
Abstract
1 H and 13C NMR relaxation times (T1) of ethoxycarbonylmethyl derivatives of p-t-butylcalix[n]arenes have been determined at 90 MHz and 36 °C in [2H8]THF. It was found that these calixarenes feature a ‘seesaw motion’ around the ArCH2Ar linkage as a central support and that this molecular motion is largely suppressed through complexation with Na +.Keywords
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