Fluorescence sensitization and quenching in a particulate chlorophyll model system

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5939601

Seely, G R; Senthilathipan, V

The success of photosynthesis as an energy-conversion process is largely owing to the manner in which the light-gathering and reaction center pigments are arranged within the thylakoid membrane. A particularly important condition in the construction of model systems based on these pigments is the need to avoid quenching of fluorescence until useful electron transfer takes place. In the model system under investigation, concentration quenching of chlorophyll is prevented by embedding the pigment molecules, along with certain amphiphiles, in the viscous hydrocarbon surface layer of swollen particles of polyethylene. Triplet state photoreactivity of chlorophyll on these particles can readily be demonstrated. Quinones such as Vitamin K/sub 1/ do not quench the fluorescence of chlorophyll even when incorporated at high concentration in the particles. But specially made amphiphiles, containing an amide group to ligate the Mg of chlorophyll, and a reducible group such as quinone, quench the fluorescence even at modest concentrations. The photochemistry of these systems is under investigation. 6 references, 3 figures.

• Research Organization: Battelle-Charles F. Kettering Research Lab., Yellow Springs, OH (USA)
• DOE Contract Number: AC02-82ER12039
• OSTI ID: 5939601
• Report Number(s): DOE/ER/12039-4; CONF-830622-29; ON: DE85007023
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
550500 -- Metabolism
59 BASIC BIOLOGICAL SCIENCES
ALKALINE EARTH METALS
AMIDES
AROMATICS
BIOLOGICAL MODELS
BIOMIMETIC PROCESSES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHEMISTRY
CHLOROPHYLL
ELEMENTS
FLUORESCENCE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
LUMINESCENCE
MAGNESIUM
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOSYNTHESIS
PHYTOCHROMES
PIGMENTS
POLYETHYLENES
POLYMERS
POLYOLEFINS
PORPHYRINS
QUENCHING
QUINONES
SYNTHESIS