Ratiometric Fluorescent/Colorimetric Cyanide-Selective Sensor Based on Excited-State Intramolecular Charge Transfer鈭扙xcited-State Intramolecular Proton Transfer Switching

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• 作者：Wei-Chi Lin ; Sin-Kai Fang ; Jiun-Wei Hu ; Hsing-Yang Tsai ; Kew-Yu Chen
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：May 20, 2014
• 年：2014
• 卷：86
• 期：10
• 页码：4648-4652
• 全文大小：365K
• 年卷期：v.86,no.10(May 20, 2014)
• ISSN：1520-6882

文摘

A novel salicylideneaniline-based fluorescent sensor, SB1, with a unique excited-state intramolecular charge transfer鈥揺xcited-state intramolecular proton transfer (ESICT鈥揈SIPT) coupled system was synthesized and demonstrated to fluorescently sense CN^{鈥?/sup> with specific selectivity and high sensitivity in aqueous media based on ESICT鈥揈SIPT switching. A large blue shift (96 nm) was also observed in the absorption spectra in response to CN鈥?/sup>. The bleaching of the color could be clearly observed by the naked eye. Moreover, SB1-based test strips were easily fabricated and low-cost, and could be used in practical and efficient CN鈥?/sup> test kits. Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations further support the cyanide-induced ESICT鈥揈SIPT switching mechanism. The results provide the proof of concept that the colorimetric and ratiometric fluorescent cyanide-selective chemodosimeter can be created based on an ESICT鈥揈SIPT coupled system.}