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| - Promoting Photochromism on Flavylium Derived 2-Hydroxychalcones in Aqueous Solutionsby Addition of CTAB Micelles
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| Abstract
| - A strategy to obtain photochromism from the network of chemical reactions originated by flavylium compoundsin solution is described. This strategy is particularly useful for flavylium salts bearing amino groups whichgive rise to a variety of beautiful colors but lack photochemistry in water. The trans-chalcone of 7-(N,N-diethylamino)-4‘-hydroxyflavylium interacts strongly with CTAB micelles defining a yellow dark state. Uponirradiation, the system switches to a pink-red state emerging from the flavylium cation that is formed insidethe micelle and ejected to the bulk aqueous phase. The photochemical product reverts back to the trans-chalcone adduct with the micelle in the dark. The thermodynamics as well as the kinetics of the photochromicsystem were studied in detail. The best color contrast is obtained at pH = 4.25 with Φ = 0.001 and a recoverylifetime of approximately 3 h. This photochromic system works with no need of changing the pH, whichconstitutes an important improvement over previously described systems dependent on pH jumps.
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