Photostability of a photochromic naphthopyran dye in different Sol-Gel prepared ormosil coatings
A photochromic naphthopyran derivative was embedded in sol-gel prepared thin ormosil films. The resulting samples show high transparency and exhibit a strong red colouration upon irradiation with UV light. The photostabil- ity of the photochromic molecules is strongly related to the nature of the em...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2006 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/343469 |
| Acceso en línea: | http://hdl.handle.net/10261/343469 |
| Access Level: | acceso abierto |
| Palabra clave: | Photostability Photochromic Ormosil Naphthopyran |
| Sumario: | A photochromic naphthopyran derivative was embedded in sol-gel prepared thin ormosil films. The resulting samples show high transparency and exhibit a strong red colouration upon irradiation with UV light. The photostabil- ity of the photochromic molecules is strongly related to the nature of the embedding ormosil matrix. The introduction of organic functional groups into the inner pore surface of the matrix allows tailoring the chemical environment where the dye molecules will be allocated, in terms of the effectiveness of the interaction between the photochromic molecules and the Si-OH groups on the surface of the pores, affecting the stability of the molecules upon prolonged exposition to UV light. The photostability of the molecules was increased in matrices functionalized with larger organic groups, or with larger amount of modifying groups. In this way the pho- todegradation of the photochromic molecules could be reduced by a factor of 5, as compared with the photodegrada- tion of the molecules in unfunctionalized silica matrix. |
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