On the photophysical behaviour of 4-halo-5-phenylisoxazoles

• Author(s): Fonseca, Sofia M. ; Burrows, Hugh D. ; Nunes, Cláudio M. ; Melo, Teresa M. V. D. Pinho e ; Gonsalves, António M. d'A. Rocha
• Date: 2005
• Persistent ID: http://hdl.handle.net/10316/5099
• Origin: Estudo Geral - Universidade de Coimbra
• Document Type: Article
• Language: English

Description

Detailed spectral and photophysical properties of 4-halo-5-phenylisoxazoles in cyclohexane solutions are presented, including measurements of energies of lowest excited singlet and triplet states, fluorescence quantum yields, lifetimes, phosphorescence and triplet-singlet difference absorption spectra. Upon addition of ethanol, loss of vibrational structure is observed in fluorescence spectra and attributed to formation of isoxazole-ethanol aggregates. The relevance of these properties to the photochemical and thermal reactivity of these systems is discussed. http://www.sciencedirect.com/science/article/B6TFN-4H16P6W-D/1/aee849eb84047bd4755109fdbbc0c522