ISSN:
0021-8383
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Solvatochromic and halochromic behaviour in the u.v.-vis absorption spectra of some substituted 4-arylidene-2-aryloxazol-5-ones (1-5) are studied. Positive and negative solvatochromism, depending on the substituent present, are observed in different hydrogen bonding donoracceptor (HBD-A) and hydrogen bonding acceptor (HBA) solvents. However, in non hydrogen bonding (NHB) solvents all compounds show a positive solvatochromism. A considerable intramolecular charge transfer interaction, between the donor and acceptor parts in the oxazolones studied, is observed. Small fluorescence quantum yields are observed for the oxazolones. In triethanolamine-acetone mixtures, the visible absorption spectra of the hydroxy substituted oxazolone shows an additional long-wavelength band suggesting the existance of prototropic equilibria. The prototropic equilibrium constants at different temperatures are determined.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/prac.19883300410
Permalink