Sensitization and quenching in the conversion of light energy into chemical energy. Annual progress report, February 1, 1982-January 31, 1983

Technical Report · Sun Aug 01 04:00:00 EDT 1982

OSTI ID:6938146

Cristol, S J

Work has been completed on the photorearrangements of several dibenzobarrelenes to dibenzocyclooctatetraenes (singlet reactions), the quenching of that process, and the accompanying sensitization to give dibenzosemibullvalenes, as mediated by acetone concentration. This work has demonstrated, apparently for the first time, the plausibility of a relay mechanism in which an excited singlet of a reactant, produced by direct irradiation, is quenched, the quencher intersystem crosses to its triplet state and then retransfers energy to the reactant molecule to give its triplet, which does its own chemistry. Work aimed at determining substituent effects on excited-state reaction-rate constants and reactivities has been continued. Work on excitation transfer geometry and on oxidation potential requirements in excited bichromophoric molecules is in progress or in prospect, as is work on lifetime measurements of certain excited singlet and triplet states.

• Research Organization: Colorado Univ., Boulder (USA)
• DOE Contract Number: AC02-79ER10366
• OSTI ID: 6938146
• Report Number(s): DOE/ER/10366-4; ON: DE82021592
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250800 -- Energy Storage-- Chemical
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ALKENES
AROMATICS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CYCLOALKENES
ENERGY LEVELS
ENERGY STORAGE
EXCITED STATES
HYDROCARBONS
ISOMERIZATION
KINETICS
ORGANIC COMPOUNDS
PHOTOCHEMICAL ENERGY STORAGE
PHOTOCHEMICAL REACTIONS
QUENCHING
REACTION KINETICS
RESEARCH PROGRAMS
STORAGE