Magnetic resonance studies of photosynthetic reaction centers and porphyrins: Progress report, June 1, 1987-January 10, 1988
The primary event in photosynthesis is a charge separation reaction involving chlorophylls as electron donor molecules. Work performed has been concerned with photoinduced electron transfer reactions in systems that exhibit some of the photochemical characteristics of chlorophylls. Information on factors that affect charge separation is obtained by monitoring paramagnetic species generated in the reaction using electron spin resonance (ESR) techniques. Data on structure and dynamics of doublet and triplet state molecules were obtained with magnetic resonance methods. Of special interest is the application of Fourier Transform ESR methodology in the study of the electron transfer reaction from triplet zinc tetraphenylporphyrin (ZnTPP) to duroquinone. FT ESR provides data on dynamics of free radical formation and decay with nanosecond time resolution. The technique can give detailed information on reactions that proceed at close to diffusion controlled rates. Spin polarization effects give an insight into the mechanism of the charge separation reaction.
- Research Organization:
- Massachusetts Univ., Boston (USA). Dept. of Chemistry
- DOE Contract Number:
- FG02-84ER13242
- OSTI ID:
- 5493034
- Report Number(s):
- DOE/ER/13242-4; ON: DE88004955
- Country of Publication:
- United States
- Language:
- English
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Magnetic resonance studies of photosynthetic reaction centers and porphyrins
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Related Subjects
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
ANGULAR MOMENTUM
AROMATICS
BENZOQUINONES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHLOROPHYLL
COMPLEXES
DIMERIZATION
DOCUMENT TYPES
DYE LASERS
ELECTRON TRANSFER
ELECTRONIC STRUCTURE
FERRICYANIDES
FOURIER TRANSFORMATION
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INTEGRAL TRANSFORMATIONS
IRON COMPLEXES
LASERS
LIQUID LASERS
MAGNETIC RESONANCE
MAGNETISM
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDATION
PARAMAGNETISM
PARTICLE PROPERTIES
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHETIC REACTION CENTERS
PHYSICAL PROPERTIES
PHYTOCHROMES
PIGMENTS
POLYMERIZATION
PORPHYRINS
PROGRESS REPORT
PROTEINS
QUINONES
RADICALS
RELAXATION
RESONANCE
SPIN
STRUCTURAL CHEMICAL ANALYSIS
TRANSFORMATIONS
TRANSITION ELEMENT COMPLEXES