Artificial photosynthesis using chlorophyll based carotenoid-quinone triads: Final technical progress report

Technical Report · Tue Sep 01 00:00:00 EDT 1987

OSTI ID:5780386

Gust, D; Moore, T A

Goal of this last year was the synthesis and study of a molecular tetrad consisting of a porphyrin or chlorophyll derivative covalently linked to both a carotenoid polyene and a rigid diquinone moiety. Photosynthesis converts light into chemical potential energy in the form of long-lived charge separation across a bilayer membrane. Recombination of the charge-separated state is prevented by the large distance between the final electron donor and acceptor. Reaction centers employ a series of electron transfer steps, each of which occurs over a short distance with high quantum yield. Synthetic carotenoid-porphyrin-quinone triad molecules and other molecular systems which begin to model this approach have recently been reported by our group and other researchers. In photosynthetic bacteria, the charge separation sequence includes electron donation from a bacteriopheophytin to a quinone which then transfers an electron to a second quinone. The proposed carotenoid-porphyrin-diquinone (C-P-Q-Q) tetrad was designed to model this portion of the natural photosynthetic electron transport system, and to be the next step in the evolution of increasingly complex synthetic mimics of natural solar energy conversion. Such a tetrad has been prepared. Nanosecond laser flash photolysis and picosecond fluorescence decay studies were carried out. Electron transfer reactions in C-P dyads and C-P-Q triads were studied.

• Research Organization: Arizona State Univ., Tempe (USA). Dept. of Chemistry
• DOE Contract Number: FG02-84CH10198
• OSTI ID: 5780386
• Report Number(s): DOE/CH/10198-T1; ON: DE88001660
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
PHOTOSYNTHESIS
SIMULATION
CAROTENOIDS
ELECTRON TRANSFER
ENERGY TRANSFER
FLUORESCENCE
PHOTOLYSIS
PHOTOSYNTHETIC BACTERIA
PORPHYRINS
PROGRESS REPORT
PULSED IRRADIATION
QUINONES
RADIOLYSIS
AROMATICS
CARBOXYLIC ACIDS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DOCUMENT TYPES
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
IRRADIATION
LUMINESCENCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PIGMENTS
RADIATION CHEMISTRY
RADIATION EFFECTS
SYNTHESIS
TERPENES
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)