Sensitization and quenching in the conversion of light energy into chemical energy. Progress report, February 1, 1980-January 31, 1981

Technical Report · Mon Sep 01 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/6811862· OSTI ID:6811862

Cristol, S J

Extensive data from Stern-Volmer, Lamola-Hammond, and Ilenda-Daughenbaugh-Cristol quenching kinetics have now been accumulated on photosolvolysis in t-butyl alcohol for benzyl chloride and a number of meta and para substituted benzyl chlorides. Evidence for the existence of two triplet states, one relatively short-lived (tau 0-2 nsec) which gives solvolysis product and a second, relatively long-lived (tau 5-26 nsec), which does not give product, but instead is energy wasting, has been accumulated. The system, p-acetobenzyl chloride, has been investigated in detail. A method for quenching of singlet states for measurement of singlet lifetimes in the 100 picosecond to nanosecond range is being developed. Preliminary work on benzyl acetate photosolvolysis has been conducted. Some work on the goemetrical requirements for intra-molecular excitation transfer in bichromophoric molecules has been conducted. Several dienes related to norbornadiene have been prepared and preparative photoisomerizations to quadricyclene analogues have been carried out. Considerable attention has been given to certain di-..pi..-methane rearrangements, work on most of which is still in progress. One system, the ethyl ester of dibenzobarrelene-7-carboxylic acid, has been scrutinized in detail.

• Research Organization: Colorado Univ., Boulder (USA)
• DOE Contract Number: AC02-79ER10366
• OSTI ID: 6811862
• Report Number(s): DOE/ER/10366-2
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AROMATICS
CHEMICAL REACTIONS
CHLORINATED AROMATIC HYDROCARBONS
DECOMPOSITION
DIENES
ENERGY LEVELS
EXCITED STATES
HALOGENATED AROMATIC HYDROCARBONS
HYDROCARBONS
ISOMERIZATION
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
POLYENES
QUENCHING
RESEARCH PROGRAMS
SOLVOLYSIS