Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
29238 | Journal of Photochemistry and Photobiology A: Chemistry | 2007 | 8 Pages |
Abstract
By means of UV/Vis absorption spectroscopy, NMR measurements and kinetic modelling, two spironaphthoxazine compounds bearing 5-OAlk substituent have been investigated in neutral and acidified ethanol media. The kinetics of ring opening/ring closure and the equilibrium constant, the quantum yield of photocoloration, the molar absorption coefficients of the neutral and protonated open forms and pKa values have been determined. A three-species photoreversible transformation between the closed form, the open form and the protonated open form has been observed in slightly acidified solutions.
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Authors
E.B. Gaeva, V. Pimienta, S. Delbaere, A.V. Metelitsa, N.A. Voloshin, V.I. Minkin, G. Vermeersch, J.C. Micheau,