Deuterium, methyl, and solvent effects on the phosphorescence lifetime of benzene

Journal Article · Wed Aug 01 04:00:00 EDT 1973 · J. Chem. Phys., v. 59, no. 3, pp. 1013-1027

DOI:https://doi.org/10.1063/1.1680144· OSTI ID:4391209

Haaland, D M; Nieman, G C

The phosphorescence lifetimes of benzene and a number of its methyl and deutero derivatives have been investigated in a wide variety of solvents at temperatures below 65 °K. Deuterium effects indicate a dominant role for the aryl hydrogens in the radiationless process. Methylation increases the triplet decay rate by approximately 25% per methyl group in a nearly linear fashion. Intensity data indicate that this is not due to ``allowed'' character introduced by any reduction in molecular symmetry as is theoretically predicted to be the case. Perfluorocarbons act as inert solvents for benzene derivatives whereas typical hydrocarbons produce 50% or greater changes in the lifetimes even at very low temperatures. Finally, the data suggest a common mechanistic pathway (or perturbed state) for both the effects of solvent and methyl groups

• Research Organization: Department of Chemistry, University of Rochester, Rochester, New York 14627
• Sponsoring Organization: USDOE
• NSA Number: NSA-29-004868
• OSTI ID: 4391209
• Journal Information: J. Chem. Phys., v. 59, no. 3, pp. 1013-1027, Journal Name: J. Chem. Phys., v. 59, no. 3, pp. 1013-1027; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

*DEUTERIUM-- ISOTOPE EFFECTS
BENZENE
EMISSION SPECTRA
LIFETIME
N40220* --Chemistry--Inorganic
Organic
& Physical Chemistry--Isotopic Effects
PHOSPHORESCENCE