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1991 (2)
1990 (1)
1Author    Snezhana BakalovaRequires cookie*
 Abstract    o lv e n t E f fe c ts o n th e F lu o re s c e n c e P r o p e r tie s o f M e th y ld ih y d ro q u in o lin o n e s The absorption and fluorescence spectra and the fluorescence quantum yields of two methyl-2,3-dihydro-4(lH)-quinolinones in various solvents are reported. In some solvents deuteration-induced fluorescence enhancement has been observed. The solvent effects in aprotic solvents are consistent with the general type of solvent interaction. For protic solvents, solute-solvent complexation in the excited state is suggested. 
  Reference    Z. Naturforsch. 46a, 823—827 (1991); received May 24 1991 
  Published    1991 
  Keywords    Fluorescence, Dihydroquinolinones, Hydrogen bond 
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 TEI-XML for    default:Reihe_A/46/ZNA-1991-46a-0823.pdf 
 Identifier    ZNA-1991-46a-0823 
 Volume    46 
2Author    Sn Bakalova, L. Biczó, I. Kavrakova, T. BércesRequires cookie*
 Title    Photophysical and Photochemical Properties of 2,3-Dihydro-4(l H)-quinolinones. Part I. Fluorescence Properties  
 Abstract    Absorption spectra and fluorescence properties o f 2,3-dihydro-4(1 H)-quinolinone deriva­ tives were studied at room temperature in different solvents. It has been found that the fluo­ rescence quantum yields and fluorescence decay times strongly depend on the molecular struc­ ture and solvent polarity. The character and the energy o f excited states were determined by PPP and C N D O /S quantum-chemical calculations. 
  Reference    Z. Naturforsch. 45c, 980—9 (1990); received March 16/July 2 1990 
  Published    1990 
  Keywords    Dihydroquinolinones, Fluorescence Properties, Excited Singlet States 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0980.pdf 
 Identifier    ZNC-1990-45c-0980 
 Volume    45 
3Author    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