Kinetic analysis of the photochromic behavior of a naturally occurring chromene (lapachenole) under steady irradiation
by Favaro, G.; Mazzucato, U.; Ottavi, G.; Becker, R.
The photokinetic behavior of a naturally occurring chromene, lapachenole (2,2-dimethyl-6-methoxy-7,8-benzo(2H)chromene, Ch), has been investigated by using monochromatic irradiation in the UV and visible ranges. Two colored photoproducts were identified: one is thermoreversible, the other is thermostable and photoreversible. The quantum yields of the color-forming and color-bleaching photoreactions were determined by a spectrokinetic method. The kinetic parameters of the thermal steps were measured (285 - 325 K). The sensitized color-forming reaction was also investigated, using thioxantone as a triplet sensitizer. A plausible reaction mechanism is proposed.
- Journal
- Molecular Crystals and Liquid Crystals Science and Technology Section A-Molecular Crystals and Liquid Crystals
- Volume
- 298
- Year
- 1997
- Start Page
- 137-144
- URL
- https://dx.doi.org/10.1080/10587259708036153
- ISBN/ISSN
- 1058-725X
- DOI
- 10.1080/10587259708036153