Biphenyl in a cooled alcoholic solution shows structured TT absorption bands, weak in the visible and strong in the UV with a maximum at 3'7OOA and en Er= 50 000 litre mole-1 cm-I. Calculations using the PPP SCF method with a large configuration interaction are done using a planar model. The influen
Triplet-triplet absorption of aza- and diazaphenanthrenes
β Scribed by S. N. Petrov; A. I. Bocherkov; V. D. Shatrov; V. S. Kuznetsov; I. G. Batekha; A. V. El'tsov
- Publisher
- Springer US
- Year
- 1980
- Tongue
- English
- Weight
- 410 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0021-9037
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Triplet-triplet absorption of biphenylene was sensitized by naphthalene. A band is observed at 29 500 cm-l and is assigned to a predicted 3B& + 3B& transition. Triplet biphenylene has a lifetime of 100 psec in solution. Nonradiative processes are thought to affect mainly the first singlet state of b
Triplet-triplet absorption spectra of coumarin and 7-hydrox~coumarin in rigid alcoholic solutions at 1 IFE; were reco&ed. Measurement of ground state depletion allowed the determination of the molar extinction coefficients of the triplet bands, for both compounds. CNDO/S calculations of the triplet-