Electrochemical and optical studies on model photosynthetic systems: Progress report for the period 7/1/84 to 12/1/86

Technical Report · Mon Dec 01 00:00:00 EST 1986

OSTI ID:6773422

Cotton, T M

Objective of this research is to study the relation between the structure of photosynthetic pigments and their spectroscopic and electrochemical properties. Model systems under study progress from the least ordered (solutions) through the most highly ordered (Langmuir-Blodgett (LB) monolayers) systems containing BChl, BPheo, and UQ. Vesicles, intermediate between solutions and LB monolayers, are also under investigation. Molecules other than the photosynthetic pigments and quinones have been examined, including chromophores (i.e., surface active cyanine dyes and phthalocyanines) and redox active compounds (methyl viologen (MV) and surfactant ferrocenes), in order to develop the techniques needed to study the photosynthetic components. The chlorophylls are photosensitive and labile. Thus, it is easier first to develop procedures using stable species. During this period, we have focused on the application of electrochemical methods for determining the heterogeneous electron transfer rate constants of BChl and BPheo at metal electrodes (Pt and Au). We have also determined the effect of adsorption on the redox properties of quinones. Resonance Raman (RR) and surface enhanced resonance Raman (SERR) spectroscopy were used to study solution and surface species.

• Research Organization: Nebraska Univ., Lincoln (USA). Dept. of Chemistry
• DOE Contract Number: FG02-84ER13261
• OSTI ID: 6773422
• Report Number(s): DOE/ER/13261-1; ON: DE87010086
• 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
PHOTOSYNTHETIC REACTION CENTERS
RESEARCH PROGRAMS
ADSORPTION
ELECTRODES
ELECTRON TRANSFER
LAYERS
PHOTOELECTROCHEMICAL CELLS
PHOTOSYNTHESIS
PIGMENTS
QUINONES
REDOX REACTIONS
AROMATICS
CHEMICAL REACTIONS
ELECTROCHEMICAL CELLS
EQUIPMENT
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
SOLAR EQUIPMENT
SORPTION
SYNTHESIS
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)