Particulate models of photosynthesis: Final report for the period April 8, 1980-September 7, 1986

Technical Report · Sat Nov 01 04:00:00 EST 1986

OSTI ID:6886080

Seely, G R

A new model system for investigation of chlorophyll-sensitized photochemical energy-conversion reactions has been developed. The system consists of chlorophyll adsorbed with other amphiphilic materials to viscous, swollen polyethylene particles, suspended in an aqueous medium also rendered viscous with high polymers. The high viscosity of the particles prevents bimolecular quenching reactions that would otherwise limit chlorophyll singlet state photochemistry. Chlorophyll is maintained in states of low aggregation by amphiphiles that coordinate with the Mg. Such preparations are characterized by complex absorption spectra and strong fluorescence from chlorophyll aggregates as well as monomer, which depend on the structure of the bound amphiphile. A large number of photochemical reactions of chlorophyll and pheophytin have been observed with this system, including several without known analogs in homogeneous and other heterogeneous systems. A novel feature of this system is the incorporation of oxidizing amphiphiles, molecules that simultaneously adsorb to the particles, ligate the Mg of chlorophyll, and accept an electron from its excited state. The Report summarizes published and otherwise unpublished work on these and other aspects of the model system. 19 refs., 5 figs.

• Research Organization: Battelle-Charles F. Kettering Research Lab., Yellow Springs, OH (USA)
• DOE Contract Number: FG02-84ER13187
• OSTI ID: 6886080
• Report Number(s): DOE/ER/13187-3; ON: DE87006267
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
ABSORPTION SPECTRA
AMIDES
AMINO ACIDS
AROMATICS
AZINES
BIOMIMETIC PROCESSES
CARBOXYLIC ACIDS
CHLOROPHYLL
COAGULANTS
DRUGS
EMISSION SPECTROSCOPY
FLUORESCENCE SPECTROSCOPY
HEMATOLOGIC AGENTS
HEPARIN ANTAGONISTS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MEMBRANES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PHOTOSYNTHETIC MEMBRANES
PHYTOCHROMES
PIGMENTS
POLYETHYLENES
POLYMERS
POLYOLEFINS
PORPHYRINS
PROTEINS
PYRIDINE
PYRIDINES
QUINONES
SPECTRA
SPECTROSCOPY
TEMPERATURE DEPENDENCE
VITAMIN K
VITAMINS