Investigation of the structure of photosynthetic reaction centers. Final report, June 1, 1981-May 31, 1984
Technical Report
·
OSTI ID:7119211
A spectroscopic study was made of some water-soluble porphyrins. Dimer formation of tetra(4-sulfonatophenyl)porphyrin and its Zn and Pd complexes has been studied using optical and triplet ESR spectroscopy. The data give information on dimer geometry as well as on dimerization effects on photo-excited triplet properties. It is found that dimerization effects mimic those associated with a transition from in vitro bacteriochlorophyll monomers to primary donor bacteriochlorophyll in reaction centers of photosynthetic bacteria. An ENDOR study was made of the solvation of a porphyrin cation radical. The study established that the ENDOR technique can provide information on weak interactions between paramagnetic macrocycles and surrounding solvent molecules. ENDOR was applied in the study of the photo-excited triplet state of porphyrins and photosynthetic reaction centers randomly oriented in solid solution. Information on the hyperfine interactions between unpaired electrons and nuclear spins obtained with this technique gives an insight into the electronic and geometric structure of these systems.
- Research Organization:
- Massachusetts Univ., Boston (USA). Dept. of Chemistry
- DOE Contract Number:
- AC02-81ER10911
- OSTI ID:
- 7119211
- Report Number(s):
- DOE/ER/10911-6; ON: DE84012475
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COMPLEXES
DIMERIZATION
DIMERS
ELECTRON SPIN RESONANCE
ENDOR
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MAGNETIC RESONANCE
MULTIPLETS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PALLADIUM COMPLEXES
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
POLYMERIZATION
PORPHYRINS
RESONANCE
SOLVATION
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
TRIPLETS
ZINC COMPLEXES
400500* -- Photochemistry
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COMPLEXES
DIMERIZATION
DIMERS
ELECTRON SPIN RESONANCE
ENDOR
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MAGNETIC RESONANCE
MULTIPLETS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PALLADIUM COMPLEXES
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
POLYMERIZATION
PORPHYRINS
RESONANCE
SOLVATION
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
TRIPLETS
ZINC COMPLEXES