Temperature dependence of intersystem crossing in substituted anthracenes
โ Scribed by E.C. Lim; Joseph D. Laposa; Jack M.H. Yu
- Book ID
- 107801201
- Publisher
- Elsevier Science
- Year
- 1966
- Tongue
- English
- Weight
- 656 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0022-2852
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๐ SIMILAR VOLUMES
The temperature dependence of the rate constant for intersystem crossmg from St of pyrene w;ts dctcmuncd by mans of a method proposed prcnously. In contrast to the conclusions of Stevens, Thomaz and Jones, and of Kropp, Dawson snd Wmdsor, we conclude that both temperature-mdependenr and trmpcr~tured
Lcitrsttthl B fi P#tystkaLkk Chentie der T2chtiscItett tittiwmlrif Brattttschr eig. D-3300 Bmuttscht eig\_ Gertttmt\_v Receivrd 7 November I978 A singIe Iinear gorrelation between the activztion energy of St-T intersystem crossing and the iogxithm of the bimolecuhr ~uorexence quenching rate constant
A temperature dependent intersystem crossing rate is observed below ca. 170ยฐK for anthracene in methyl tetrahydrofuran. From the temperature dependence of the 0.0 bands in absorption and emission, this is interpreted as being due to slow lattice relaxation in the excited singlet state.
An unusual temperature ,effect on ihe intensity of fluorescence of 9-carbonyl derivhtives of anthracene is observed: ihis is interpreted in terms of an intersystem crossing process from the lowest excited singlet state, !+r to the higher excited triplet state T,&\_ ,. Investigations of temperature