Accession Number:

AD0735272

Title:

Molecular and Electronic Mechanisms of Biological Energy Conversion Processes.

Descriptive Note:

Final rept. 20 Sep 67-1 Feb 71,

Corporate Author:

ARIZONA UNIV TUCSON DEPT OF CHEMISTRY

Personal Author(s):

• Tollin,Gordon

Report Date:

1971-05-01

Pagination or Media Count:

87.0

Abstract:

The chemistry and enzymology of flavin has been studied by examining molecular complex formation with phenols and indoles and the binding of flavin analogs to apoprotein. Spectroscopic, kinetic and thermodynamic approaches have been used. Considerable insight has been obtained into the role of environmental factors in modifying the chemical and physical properties of the flavin molecule. Chlorophyll one-electron photochemistry in solution has been investigated using optical, ESR and flash photolysis techniques. Evidence has been obtained for a chlorophyll-photosensitized one-electron transfer from solvent alcohols, pyridine to quinone leading to the formation of a chlorophyll-semiquinone complex stabilized via coordination with the central magnesium ion. Author

Descriptors:

• *ANTHOXANTHIN PIGMENTS
• *COMPLEX COMPOUNDS
• *PHOTOCHEMICAL REACTIONS
• *QUINONES
• PHOTOCHEMICAL REACTIONS
• INDOLES
• PHENOLS
• PROTEINS
• CHEMICAL BONDS
• VISIBLE SPECTRA
• ULTRAVIOLET SPECTRA
• REACTION KINETICS
• FREE RADICALS
• THERMODYNAMICS

Subject Categories:

• Biochemistry
• Radiation and Nuclear Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE