Abstract
A photochromic system based on dracoflavylium, a natural pigment extracted from Dragon's blood, a resin appearing in the injury parts of the tree Dracaena draco, is studied in water. The photochromism arises from the irradiation of the trans-chalcone, giving a mixture of flavylium cation/ quinoidal base as a photoproduct via cis-chalcone and hemiketal. The performance of the photochromic system can be improved in the presence of (2-hydroxypropyl)-beta-cyclodextrin. A mathematical model to account for the details of the kinetics and thermodynamics of the system was deduced. The model is general for all the host-guest systems involving the flavylium network of chemical reactions with 1 : 1 stoichiometric association.
Original language | English |
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Pages (from-to) | 1420-1426 |
Number of pages | 7 |
Journal | Photochemical & Photobiological Sciences |
Volume | 13 |
Issue number | 10 |
DOIs | |
Publication status | Published - Oct 2014 |
Keywords
- BETA-CYCLODEXTRIN
- FLAVYLIUM ION
- HYDRATION