Triplet triplet absorption of biphenyl and related compounds |
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Authors: | D. Lavalette C. Tetreau |
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Affiliation: | Institut du Radium, Biologie, 91405 Orsay, France |
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Abstract: | Triplet triplet absorption spectra of biphenyl, carbazole and phenanthrene have been studied in rigid glass at 77 K. Oscillator strengths and polarizations are reported. A theoretical study has been performed using the Pariser-Parr-Pople approximation in order to support the band assignments.Phenanthrene is shown to be definitely not related to the other members of the series. Triplet-triplet oscillator strengths are decreased in carbazole, as compared to biphenyl. This effect is discussed in terms of a possible dilution of the ground triplet, in addition to the spectral dilution of the upper triplet states, as previously observed in derivatives of alternant molecules. |
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