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1991 (1)
1Author    Sn Bakalova, L. Biczók, T. BércesRequires cookie*
 Title    Photophysical and Photochemical Properties of 2,3-Dihydro-4(l H)- quinolinones. Part II. Rates and Mechanism of Primary Processes  
 Abstract    Fluorescence quantum yields, singlet lifetimes and triplet yields for 2-methyl-2,3-dihydro-4(1 H)-quinolinone and N -m ethyl-2,3-dihydro-4(l H)-quinolinone were determined as a func­ tion o f temperature. In non-polar solvents, an efficient non-radiative process identified as an indirect singlet —* • triplet transition occurring through S2(n,jr*) was found to depopulate the lowest S 1(7t,7E*) state. In polar solvents, direct singlet —> triplet intersystem crossing appears to dominate. Photochemical dehydrogenation produced the corresponding 4(1 H)-quinolinone with a yield o f few times 10"2. This was shown to be the only traceable reaction route. 
  Reference    Z. Naturforsch. 46c, 549 (1991); received March 16/A pril4 1991 
  Published    1991 
  Keywords    Dihydroquinolinones, Triplet Yields, Fluorescence Quantum Yields, Photochemical D ehy­ drogenation, Singlet Lifetimes 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0549.pdf 
 Identifier    ZNC-1991-46c-0549 
 Volume    46