Naslov
Photochemical Valence Isomerization of 9-tert-Butylanthracene

Autori
Güsten, Hans ; Mintas, Mladen ; Klasinc, Leo

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
VIII IUPAC Symposium on Photochemistry

Mjesto i datum
Seefeld in Tirol, Austrija, 13.07.1980. - 19.07.1980

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
9-tert-butilantracen; fotokemijska valencijska izomerizacija
(photochemical valence isomerization; 9-tert-butylanthracene)

Sažetak
The exothemicity of the valence isomerization of l– tert-butyldibenzo-2, 5-bicyclo (2.2.0) hexadiene [9-tert-butyl-9, 10-(Dewar-anthracene)] to 9-tert-butylanthracene in n-hexane was determined by calorimetry to ∆ Hr = 37 ± ; 2 kcal/mol. The activation enthalpy ∆ H = 23.6 ± ; 1.4 kcal/mol and the entropy ∆ S = 0.26 ± ; 4.4 e.u. are in agreement with the kinetic data for the aromatization of other Dewar isomers. Photoisomerization of 9-tert-butylanthracene to the Dewar isomer 9-tert-butyl-9, 10 (Dewar-anthracene) was observed in aerated aquequs micellar solutions at room temperature. The triplet state od 9-tert-butylanthracene was detected by nanosecond laser photolysis as well as indirectly by the measurement of singlet oxygen produced in a reaction between the triplet state of 9-tert-butylanthracene and molecular oxygen.The quantum yield of formation of the triplet state of 9-tert-butylanthracene and molecular oxygen. The quantum yield of the formation of anthracene.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

Napomena
Rad je kao poster prezentiran i na skupovima: The American Chemical Society Meeting, održanom od 22.-29.08.1980.g., Las Vegas, SAD, te na II. jugoslavenskom simpoziju o organskoj kemiji, od 17-19.02.1981., Zagreb, Jugoslavija.

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