期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 199, 期 1, 页码 98-104出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2008.05.012
关键词
pH chemosensor; photoinduced electron transfer; excited-state intramolecular proton; transfer
资金
- 3degree Quadro Comunitario de Apoio (FEDER)
- Education Department of Hainan Province [HjKj 200601]
- Hainan Provincial Key Laboratory of Fine Chemistry [hnfc2006004]
- FCT in Portugal [SFRH/BPD/30868/2006]
- [POCI/QUI/57387/2004]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/30868/2006, POCI/QUI/57387/2004] Funding Source: FCT
A novel pH fluorescent chemosensor based on 2-hydroxybenzaldehyde 1-naphthoyl hydrazone (SNH) has been synthesized. This sensor has the ability to respond to both low and high pH values at different wavelengths. In acidic media, the fluorescence of SNH enhanced dramatically at shorter wavelength (lambda(em) = 380 nm, phi(f)=0.08) while in basic media the fluorescence at longer wavelength (lambda(em) = 500 nm, phi(f)=0.02) increased. At intermediate pH values (5-9), is detected the appearance of a weak emission at 460 nm, likely due to a keto-phototautomer associated to an intramolecular excited-state proton transfer. A complex mechanism tunable in the range of pH 1-11 with at least three fluorescent species at lambda(em) = 380, 460 and 500 nm is proposed. (C) 2008 Published by Elsevier B.V.
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