Artificial photosynthesis using chlorophyll based carotenoid-quinone triads: Final technical progress report
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
- Country of Publication:
- United States
- Language:
- English
Similar Records
Photoinitiated charge separation in a carotenoid-porphyrin-diquinone tetra: enhanced quantum yields via multistep electron transfers
Artificial photosynthesis using chlorophyll based carotenoid quinone triads: A brief synopsis of research progress as of 31 December 1986
Related Subjects
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
AROMATICS
CARBOXYLIC ACIDS
CAROTENOIDS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DOCUMENT TYPES
ELECTRON TRANSFER
ENERGY TRANSFER
FLUORESCENCE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
IRRADIATION
LUMINESCENCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHOTOSYNTHESIS
PHOTOSYNTHETIC BACTERIA
PIGMENTS
PORPHYRINS
PROGRESS REPORT
PULSED IRRADIATION
QUINONES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
SIMULATION
SYNTHESIS
TERPENES