Time-resolved electron spin resonance study of photooxidation of zinc tetraphenylporphyrin by benzoquinone

Journal Article · Wed Mar 22 23:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100343a043· OSTI ID:5061883

van Willigen, H; Vuolle, M ^[1]; Dinse, K P ^[2]

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1. Univ. of Massachusetts, Boston (USA)
2. Univ. of Dortmund (Germany, F.R.)

The pulsed-dye laser-induced photooxidation of ZnTPP by benzoquinone has been studied with time-resolved direct-detected electron spin resonance (ESR). Spectra of free radicals can be obtained with 1 {mu}s after the laser pulse. For the first time the ESR spectra of both the anion and cation radicals generated in the electron-transfer reaction have been observed. The time-resolved spectra show triplet and radical pair spin polarization (CIDEP) effects that can be linked to the mechanism of the photoinduced charge separation reaction. The CIDEP effects give semiquantitative data on rate constants.

• DOE Contract Number: FG02-84ER13242
• OSTI ID: 5061883
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:6; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ANIONS
AROMATICS
BENZOQUINONES
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
COMPLEXES
DATA
DYE LASERS
ELECTRON SPIN RESONANCE
ELECTRON TRANSFER
EXPERIMENTAL DATA
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
IONS
LASERS
LIQUID LASERS
MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDATION
PHOTOCHEMICAL REACTIONS
PORPHYRINS
QUINONES
REACTION INTERMEDIATES
REDOX REACTIONS
RESONANCE
ZINC COMPLEXES