Lifetimes and energies of the relaxed triplet states of cyclopentadiene and tetramethylbutadiene. A pulse radiolysis and pulsed laser study

Journal Article · Wed Jul 29 04:00:00 EDT 1981 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00405a042· OSTI ID:6040290

Gorman, A A; Gould, I R; Hamblett, I

The triplet states of cyclopentadiene and tetramethylbutadiene have been produced in benzene by pulse radiolysis. Energy-transfer experiments have established natural lifetimes of 1.7 ..mu..s and 73 ns, respectively. The observation of triplet energy transfer equilibria with pulse radiolysis and pulsed laser photolysis has established a relaxed triplet energy for cyclopentadiene of 58.0 +- 0.2 kcal mol/sup -1/, which shows that relaxation from the Franck-Condon state is negligible. An approximate available triplet energy of 42 kcal mol/sup -1/ for the relaxed tetramethylbutadiene triplet has been determined. The rate constant data for energy transfer obtained by using both pulse radiolysis and pulsed laser photolysis appear totally consistent with vertical energy transfer processes only. 6 figures.

• Research Organization: Univ. of Manchester, England
• OSTI ID: 6040290
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 103:15; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALKENES
AROMATICS
BENZENE
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CYCLOALKENES
CYCLOPENTADIENE
DATA
DECOMPOSITION
DIENES
ENERGY TRANSFER
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
IRRADIATION
KINETICS
MULTIPLETS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
POLYENES
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
REACTION KINETICS
TRIPLETS