Investigation of the structure of photosynthetic reaction centers. Progress report, January 6, 1983-November 5, 1983

Technical Report · Tue Nov 01 04:00:00 EST 1983

OSTI ID:5495509

van Willigen, H

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. 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 molecults. ENDOR instumentation has been adapted to accomodate a new Oxford Instruments helium cryostat.

• Research Organization: Boston Univ., MA (USA)
• DOE Contract Number: AC02-81ER10911
• OSTI ID: 5495509
• Report Number(s): DOE/ER/10911-5; ON: DE84002886
• Country of Publication: United States
• Language: English

Related Subjects

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59 BASIC BIOLOGICAL SCIENCES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHLOROPHYLL
COMPLEXES
DIMERIZATION
DIMERS
ELECTRON SPIN RESONANCE
ENDOR
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MAGNETIC RESONANCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PALLADIUM COMPLEXES
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYTOCHROMES
PIGMENTS
POLYMERIZATION
PORPHYRINS
RESEARCH PROGRAMS
RESONANCE
SOLVATION
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
ZINC COMPLEXES