Display options
Cite
Frigoli M, Pimienta V, Moustrou C, et al. Continuous irradiation and flash-photolysis studies of new[3H]naphtho[2,1-b]pyrans linked by covalent bonds to oligothiophene units. Effect of thiophene substituents on the photochromism. Photochem Photobiol Sci. 2003;2(8):888-92doi: 10.1039/b301999c.
Frigoli, M., Pimienta, V., Moustrou, C., Samat, A., Guglielmetti, R., Aubard, J., Maurel, F., & Micheau, J. C. (2003). Continuous irradiation and flash-photolysis studies of new[3H]naphtho[2,1-b]pyrans linked by covalent bonds to oligothiophene units. Effect of thiophene substituents on the photochromism. Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology, 2(8), 888-92. https://doi.org/10.1039/b301999c
Frigoli, Michel, et al. "Continuous irradiation and flash-photolysis studies of new[3H]naphtho[2,1-b]pyrans linked by covalent bonds to oligothiophene units. Effect of thiophene substituents on the photochromism." Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology vol. 2,8 (2003): 888-92. doi: https://doi.org/10.1039/b301999c
Frigoli M, Pimienta V, Moustrou C, Samat A, Guglielmetti R, Aubard J, Maurel F, Micheau JC. Continuous irradiation and flash-photolysis studies of new[3H]naphtho[2,1-b]pyrans linked by covalent bonds to oligothiophene units. Effect of thiophene substituents on the photochromism. Photochem Photobiol Sci. 2003 Aug;2(8):888-92. doi: 10.1039/b301999c. PMID: 14521228.
Copy Download .nbib Format: NLM
Share it on

Photochem Photobiol Sci. 2003 Aug;2(8):888-92. doi: 10.1039/b301999c.

Continuous irradiation and flash-photolysis studies of new[3H]naphtho[2,1-b]pyrans linked by covalent bonds to oligothiophene units. Effect of thiophene substituents on the photochromism.

Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology

Michel Frigoli, Véronique Pimienta, Corinne Moustrou, André Samat, Robert Guglielmetti, Jean Aubard, François Maurel, Jean-Claude Micheau

Affiliations

  1. UMR 6114, Université de la Méditerranée, 163 Avenue de Luminy, 13288, Marseille 9, France.

PMID: 14521228 DOI: 10.1039/b301999c

Abstract

The influence of oligothiophene substituents on five new [3H]naphtho[2,1-b]pyrans has been investigated using flash photolysis and continuous irradiation techniques. Photochromic properties strongly depend on the number and position of the thienyl units. Thienyl substitution increases the UV/visible absorbance of the lower energy transition of both the naphthopyran and merocyanine isomers. The rate constants of the thermal fading processes also increase with the number of thiophenic entities. Although several minor photoisomers, whose relative amounts depend on the irradiation conditions could be involved, it has been assumed that under continuous monochromatic irradiation, the evolution of the photochromic reaction can be described by the formation of only one photoisomer. Under these conditions, quantum yields of photocolouration and molar absorption coefficients of the non-isolable photomerocyanine isomer were evaluated by photokinetic analysis. Flash-photolytic colourability can be interpreted using continuous irradiation parameters. A linear correlation has been established between experimental and calculated colourability. This result shows that similar photochromic reactions leading to similar photoisomers are triggered either by polychromatic flash photolysis or by continuous monochromatic irradiation.

Publication Types