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1:1 Hydrogen bonded complexes of phenol and 4-fluorophenol with 2,2,6,6-tetramethylpiperidin-1-oxyl: an electron spin resonance study

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dc.contributor.author Brass, Ian J.
dc.contributor.author Bullock, Anthony T.
dc.date.accessioned 2025-04-12T05:02:43Z
dc.date.available 2025-04-12T05:02:43Z
dc.date.issued 1978
dc.identifier.uri http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/18655
dc.description.abstract The hydrogen donor molecules phenol and 4-fluorophenol form 1:1 complexes with 2,2,6,6-tetramethylpiperidin-1-oxyl in solution in carbon tetrachloride. The formation constants of both complexes have been obtained over a range of temperatures by measuring aN, the 14N coupling constant of the nitroxide, as a function of donor concentration. The enthalpies of formation were found to be –19.2 ± 0.7 and –23.6 ± 0.4 kJ mol–1 for the phenol and 4-fluorophenol complexes, respectively. The value for phenol is in acceptable agreement with the calorimetric measurements of Lim and Drago. The temperature coefficients of aC, the nitrogen coupling constants for the complexed radicals, are explained in terms of asymmetric double-minima potentials having energy separations between the minima of 8.8 ± 1.3 and 6.5 ± 0.9 kJ mol–1 for the phenol and 4-fluorophenol complexes. en_US
dc.language.iso en en_US
dc.publisher Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (06) en_US
dc.subject Chemistry en_US
dc.subject Hydrogen-bonded complexes en_US
dc.subject Phenol en_US
dc.subject Journal of the Chemical Society : Faraday Transaction - I en_US
dc.title 1:1 Hydrogen bonded complexes of phenol and 4-fluorophenol with 2,2,6,6-tetramethylpiperidin-1-oxyl: an electron spin resonance study en_US
dc.type Article en_US


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