Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/17872
Título: | Photochromic hybrid sol-gel films containning naphtopyrans |
Autor(es): | Coelho, Paulo J. Carvalho, Luís M. Gonçalves, Luís F. F. F. Silva, Carlos J. R. Campos, Ana M. F. Oliveira Gomes, M. J. M. |
Palavras-chave: | Naphtopyran Sol-gel Ureasilicate Organic-inorganic hybrid Phtochromism UV light Kinetics Naphthopyran Photochromism |
Data: | Jul-2010 |
Editora: | Springer Science+Business Media |
Revista: | Journal of Sol-Gel Science and Technology |
Resumo(s): | Several photochromic benzo- and naphthopyrans were embedded in hybrid organic-inorganic ureasilicate based films obtained by a sol-gel process. The resulting films, containing 0,1 % (w/w) of the photochromic compound, were transparent and flexible and for naphthopyrans they were colourless or presented just a slight colouration. Under UV continuous irradiation the films developed a significant absorption in the visible region that fades in the dark with variable kinetics depending on the naphthopyran structure. 2,2-Diphenyl-3H-naphtho[2,1-b]pyran films showed a very fast colouration under UV light giving rise to coloured open forms, containing mainly the TC isomer (98%) along with a very small amount of the more stable TT isomer (2%), that practically returned to the initial absorbance in one minute. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/17872 |
DOI: | 10.1007/s10971-010-2295-5 |
ISSN: | 0928-0707 |
Versão da editora: | http://dx.doi.org/10.1007/s10971-010-2295-5 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Photochromic sol V 8.0.doc revised.pdf Acesso restrito! | 158,75 kB | Adobe PDF | Ver/Abrir |