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Chemistry of Heterocyclic Compounds

, Volume 27, Issue 1, pp 32–37 | Cite as

Luminescence-spectral and acid-base characteristics of 3-aryl-7-diethylaminocoumarins

  • N. S. Patalakha
  • D. S. Yufit
  • M. A. Kirpichenok
  • N. A. Gordeeva
  • Y. T. Struchkov
  • I. I. Grandberg
Article

Abstract

The absorption and fluorescence spectra and the acid-base characteristics of 7-diethylaminocoumarins containing an aromatic substituent at position 3 and H, Cl, CH 3 ,CF 3 ,and N(CH 2 CH 2 ) 2 O at position 4 were studied. For the para-substituted derivatives a linear correlation was obtained between the pK a values and the Hammett σ p constants. On the basis of the obtained data, and also of an x-ray crystallographic investigation of 3-phenyl-4-methyl-7-diethylaminocoumarin it was concluded that there is weak π-πconjugation between the 3-aryl groups and the coumarin fragment.

Keywords

Organic Chemistry Linear Correlation Coumarin Fluorescence Spectrum Aromatic Substituent 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Publishing Corporation 1991

Authors and Affiliations

  • N. S. Patalakha
    • 1
  • D. S. Yufit
    • 1
  • M. A. Kirpichenok
    • 1
  • N. A. Gordeeva
    • 1
  • Y. T. Struchkov
    • 1
  • I. I. Grandberg
    • 1
  1. 1.K. A. Timiryazev Moscow Agricultural AcademyUSSR

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