engleski

Photochemical Valence Isomerization of 9-tert-Butylanthracene

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.

photochemical valence isomerization; 9-tert-butylanthracene

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.