Primary change separation and a biomimetic model of photosynthetic oxygen evolution

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5355011

Davis, M S; Forman, A; Fujita, I; Netzel, T L; Fajer, J

The transformation of light into the chemical energy that drives the fixation of CO/sub 2/ and the evolution of O/sub 2/ in green plant photosynthesis is mediated by two photosystems (PS I and PS II). The initial photoreactions in both photosystems consist of the absorption of light by chlorophyll a (Chl a) and the subsequent formation of chlorophyll ..pi..-cation radicals by photoejection of electrons to nearby acceptors. The identity and chemical nature of the primary donor and acceptor of PS II are considered. These species are of prime concern to biomimetic solar energy conversion because the primary photosynthetic reaction produces a strong oxidant capable of driving O/sub 2/ evolution, and because the electronic configurations of the donor and acceptor must influence the efficient forward electron transfer from the donor while inhibiting efficient wasteful back reactions of the photoproduced cation and anion radicals.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5355011
• Report Number(s): BNL-28028; CONF-800827-2
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
550200 -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
ANIONS
BIOMIMETIC PROCESSES
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHLOROPHYLL
CONVERSION
CRYOGENIC FLUIDS
ELECTRON TRANSFER
ELEMENTS
ENERGY CONVERSION
FLUIDS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
IONS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYTOCHROMES
PIGMENTS
PORPHYRINS
RADICALS
SOLAR ENERGY CONVERSION
SYNTHESIS