Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/13091
Título: | N-(Di)icosyl-substituted benzo[a]phenoxazinium chlorides : synthesis and evaluation as near-infrared membrane probes |
Autor(es): | Naik, Sarala Alves, Carla M. A. Coutinho, Paulo J. G. Gonçalves, M. Sameiro T. |
Palavras-chave: | Benzo[a]phenoxazinium dyes Membrane probes Near-infrared labels Nile blue Cationic dyes Fluorescent probes Membranes Vesicles Surfactants Imaging agents |
Data: | Mai-2011 |
Editora: | Wiley-Blackwell |
Revista: | European Journal of Organic Chemistry |
Resumo(s): | Five benzo[a]phenoxazinium chlorides containing alkyl chains with twenty carbon atoms on 5- or 9-positions of the tetracyclic ring were efficiently synthesised and characterised by UV/Vis/NIR spectroscopy. The absorption and emission maxima in ethanol lie in the range 627-641 nm and 645-676 nm, respectively, with quantum yields varying from 0.14 to 0.38. Preliminary photophysical studies with these fluorochromophores in zwitterionic (2,3- bis(palmitoyl-oxy)propyl-2-(trimethylammonio)ethyl phosphate, DPPC) and cationic (N,N-dimethyl-N-octadecyloctadecan-1-aminium bromide, DODAB) vesicles were carried out. The results showed that the new benzo[a]phenoxazinium derivatives are able to detect the gel to liquid-crystalline lipid phase transition through variations, either in the H-aggregation extent or in an acid-base equilibrium. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/13091 |
DOI: | 10.1002/ejoc.201001579 |
ISSN: | 1434-193X 1099-0690 |
Versão da editora: | http://onlinelibrary.wiley.com/ |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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EJOC 2011.pdf | Final draft post-refereeing | 587,3 kB | Adobe PDF | Ver/Abrir |