Electron photoejection in carbanions. Progress report, July 1, 1980-June 30, 1981

Technical Report · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6372853

Tolbert, L M

The results of our recent investigations in carbanion photochemistry are presented. Despite formidable energetic constraints, resonance-stabilized carbanions are able to transfer electrons to dimethyl sulfoxide with moderately high efficiencies. We have discovered an unusually long lifetime for the carbanion photoactive state, which partially explains the ability of an endothermic irreversible electron transfer to draw off excitation energy. A corollary to this result is that exoergonic electron acceptors are able to quench the excited state with extremely high efficiency. The efficiency of electron transfer is not clearly related to the formal ground state potential of the carbanions as measured by basicity. A new class of anions, the 2-aryl-1, 3-diphenylpropenyl anions, will allow us to more clearly separate ground state effects from excited state effects. We have also made significant observations on the reactivity of radicals with anions, a reaction class which has not previously been studied. Finally, we have developed a new method for calibration of photodetectors using disc calorimetry and computer techniques.

• Research Organization: Kentucky Univ., Lexington (USA). Dept. of Chemistry
• DOE Contract Number: AS05-79ER10424
• OSTI ID: 6372853
• Report Number(s): DOE/ER/10424-1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AROMATICS
CALIBRATION
CARBANIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
DMSO
ELECTRON TRANSFER
ENERGY LEVELS
EXCITED STATES
GROUND STATES
IONS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTODETECTORS
RADICALS
RESEARCH PROGRAMS
SULFOXIDES