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
Sensitized triplet-triplet absorption of biphenylene
โ Scribed by C. Tetreau; D. Lavalette; E.J. Land; F. Peradejordi
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 402 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
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 biphenylene.
๐ SIMILAR VOLUMES
Transient aburption bands are observed with naphtbakne in solution at 3200-3400 A. in the nme region a~ in the gas phase. It is shown that they do not belong to the naphthalene TT spectrum. Weak and structured 'IT bands are observed between 4300 and 6500 A with methyl derivatives as well as with nap
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-