Journal of Physical Chemistry p. 930 - 934 (1990)
Update date:2022-08-11
Topics:
Alegria, Antonio E.
Munoz, Carlos
Rodriguez, Maria S.
The thermodynamics of disproportionation of 1,4-benzosemiquinone (BQ*-) and 1,4-naphthosemiquinone (NQ*-) in cacodylic-cacodylate buffer at pH 7.1 was studied by spin resonance (ESR) spectroscopy and solution calorimetry.The disproportionation of BQ*- was found to be more exergonic and exothermic than that corresponding to NQ*- in both aqueous and gas phases.These semiquinones disproportionate about 40 times more exothermically in the gaseous than in the aqueous phase.The differences between the enthalpies of disproportionation corresponding to BQ*- and NQ*- are 51 and 14 kJ/mol in the gaseous and aqueous phases, respectively.The heats of hydration of BQ*- and NQ*- were determined with a convenient thermochemical cycle based on the enthalpies of disproportionation.The single-ion heats of hydration of BQ*- and NQ*- were found to be -360 and -377 kJ/mol, respectively.The heats of hydration of the net negative charge in BQ*- and NQ*- were found to be the same.
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