Issue 0, 1976

Excimer emission in the thermoluminescence of gamma-irradiated hydrocarbon glasses: some new spectra

Abstract

Excimers are formed by neutralisation of dimer cations of aromatic hydrocarbons when glassy solutions in methyl cyclohexane + isopentane mixtures, in cumene, decalin or squalane are allowed to warm up after radiolysis at 77 K. Squalane was found to be a useful solvent for the larger molecules. Excimer fluorescence of biphenyl, p-terphenyl, trans-stilbene, diphenylacetylene and perfluoronaphthalene has been observed : these emissions cannot be produced by photo-excitation. Naphthalene, pyrene, anthracene, 9-methylanthracene and perylene also gave excimers; in the last three cases, the emission was at shorter wavelengths than usual. cis-Stilbene, 1,4-diphenylbutadiene, 1,1-binaphthyl, phenanthrene, chrysene, triphenylene, biphenylene, acenaphthylene and fluoranthene gave negative or doubtful results. No excimer phosphorescence was detected despite the favourable conditions, but self-quenching of the phenanthrene triplet was observed. Methods of producing excimers are compared and the role of constraint by the matrix is discussed.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans. 2, 1976,72, 1921-1934

Excimer emission in the thermoluminescence of gamma-irradiated hydrocarbon glasses: some new spectra

M. Al-Jarrah, B. Brocklehurst and M. Evans, J. Chem. Soc., Faraday Trans. 2, 1976, 72, 1921 DOI: 10.1039/F29767201921

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