High Energy Chemistry

, Volume 39, Issue 6, pp 392–396 | Cite as

Primary Photophysical and Photochemical Processes in the Photolysis of 1,2-Dihydroquinolines in Different Solvents

  • T. D. Nekipelova
  • V. A. Kuzmin


The fluorescence lifetimes (τfl) of alkyl and alkoxy substituted dihydroquinolines (DHQ) were measured in hexane, isopropanol, methanol, and water. It was shown that τfl was determined by the solvent nature and weakly depended on substituents on the DHQ aromatic ring and heterocycle, with τfl being substantially lower in methanol than in the other solvents. The decrease in τfl in MeOH is caused by an increase in the rate constants of the photochemical reaction and nonradiative transitions in this solvent. The quantum yield of fluorescence in H2O and MeOH, in which the photoinduced addition of the solvent molecules occurs, decreases with a decrease in the excitation wavelength within the limits of long-wavelength absorption band, thus providing strong evidence that the photochemical reaction proceeds from the unrelaxed excited state.


Methanol Hexane Excited State MeOH Isopropanol 
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Copyright information

© MAIK "Nauka/Interperiodica" 2005

Authors and Affiliations

  • T. D. Nekipelova
    • 1
  • V. A. Kuzmin
    • 1
  1. 1.Emanuel Institute of Biochemical PhysicsRussian Academy of SciencesMoscowRussia

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