Mercapto thiadiazole-based sensor with colorimetric specific selectivity for AcO^{?/sup> in aqueous solution}

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• 作者：Jun-Qiang  ; Li ; Tai-Bao  ; Wei ; Qi  ; Lin ; Ping  ; Li ; You-Ming  ; Zhang  ; ;   ; ^{zhangnwnu@126.com}
• 关键词：Acetate anion sensor ; Mercapto thiadiazole ; Aqueous solution ; Single recognition ; Naked-eyes
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：83
• 期：1
• 页码：187-193
• 全文大小：1508 K
• ISSN：S1386142511007232

文摘

A novel acetate selective anion sensor 3 based on azophenol and mercapto thiadiazole had been designed and synthesized. Sensor 3 behaves a single selectivity and sensitivity in the recognition for AcO^{?/sup> anion over other anions such as F?/sup>, Cl?/sup>, Br?/sup>, I?/sup>, H₂PO₄?/sup>, HSO₄?/sup> and ClO₄?/sup> by naked-eyes and UV–vis spectra changes in aqueous solution (H₂O/DMSO, 5:5, v/v). The color of the solution containing sensor 3 had an obvious change from colorless to orange only after the addition of AcO?/sup> in aqueous solution while other anions did not cause obvious color change. 1H NMR titration results revealed that the binding process includes two steps: (i) hydrogen bonding interactions (for small quantities of acetate) and (ii) proton transfer between the sensor 3 and the coordinated anion (for high quantities of acetate). The association constant K_a was 7.35 × 103 M?. The detection limitation of AcO?/sup> with the sensor 3 was 1.0 × 10? mol L?.}