Wide-band, time-resolved photoacoustic study of electron-transfer reactions. Photoexcited magnesium porphyrin and quinones

Journal Article · Thu Aug 12 00:00:00 EDT 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100134a009· OSTI ID:5601838

Feitelson, J ^[1]; Mauzerall, D C ^[2]

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1. Hebrew Univ., Jerusalem (Israel)
2. Rockefeller Univ., New York, NY (United States)

Wide-band, time-resolved, pulsed photoacoustics has been employed to study the electron-transfer reaction between a triplet magnesium porphyrin and various quinones in polar and nonpolar solvents. The reaction rate constants are near encounter limited. The yield of triplet state is 70% in both solvents. The yield of ions is 85% in the former and zero in the latter, in agreement with spin dephasing time and escape times from the Coulomb wells in the two solvents. In methanol the plot of measured heat output versus quinone redox potential is linear. This implies that the entropy of electron transfer is constant through the series, but it may not be negligible. 16 refs., 2 figs., 1 tab.

• OSTI ID: 5601838
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 97:32; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
PORPHYRINS
CHEMICAL REACTIONS
QUINONES
CHEMICAL REACTION KINETICS
ELECTRON TRANSFER
ENTROPY
MAGNESIUM COMPOUNDS
PHOTOACOUSTIC SPECTROSCOPY
PHOTOSYNTHESIS
ALKALINE EARTH METAL COMPOUNDS
AROMATICS
CARBOXYLIC ACIDS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
KINETICS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHYSICAL PROPERTIES
REACTION KINETICS
SPECTROSCOPY
SYNTHESIS
THERMODYNAMIC PROPERTIES
400201* - Chemical & Physicochemical Properties
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)