Particulate models of photosynthesis: Technical progress report, 1 September 1986--28 February 1989

Technical Report · Mon Feb 01 04:00:00 EST 1988

OSTI ID:6430294

Seely, G R

The objective of the research is to develop photochemical energy conversion model systems based on chlorophyll adsorbed to particles of polyethylene swollen with tetradecane. A number of amphiphiles derived from histamine have been synthesized, and tested with chlorophyll on polyethylene particles. They presumably ligate chlorophyll with the imidazole group, and some are capable of accepting electrons from the singlet excited state of the pigment. During the past year, the ability of chlorophyll to interact with cationic inverted micelles of dodecylpyridium iodide in toluene has been established, primarily by NMR chemical shift measurements. A presumption that a similar association exists within polyethylene- tetradecane particles has been supported, through mainly by indirect means. There is increased interest in nitroaromatic disulfides as potentially reversible oxidants for chlorophyll in the particulate system. One of them, 2,2'-dithiobis (5-nitropyridine), reacts with chlorophyll photochemically to form derivatives with reduced fluorescence, which appear to be covalently-linked donor-acceptor complexes. Experimental procedures have been tested for correcting fluorescence spectra and estimating quantum yields in highly scattering media, with the xanthene dye, 2'7'-dichlorofluorescein, in TiO/sub 2/ suspensions. Collaborative efforts in fluorescence determination and electrochemistry have continued. 40 refs., 10 figs., 2 tabs.

• Research Organization: Arizona State Univ., Tempe (USA). Dept. of Chemistry
• DOE Contract Number: FG02-86ER13620
• OSTI ID: 6430294
• Report Number(s): DOE/ER/13620-T1; ON: DE89007961
• 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
400201 -- Chemical & Physicochemical Properties
ADSORPTION
ALKANES
AMINES
AZOLES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHLOROPHYLL
DECANE
DOCUMENT TYPES
ENERGY LEVELS
EXCITED STATES
FLUORESCENCE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HISTAMINE
HYDROCARBONS
IMIDAZOLES
LUMINESCENCE
MICELLAR SYSTEMS
MOLECULAR STRUCTURE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
OXIDATION
PARTICLES
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYTOCHROMES
PIGMENTS
POLYETHYLENES
POLYMERS
POLYOLEFINS
PORPHYRINS
PROGRESS REPORT
PROTEINS
REDUCTION
RESEARCH PROGRAMS
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
SWELLING
SYNTHESIS