A novel urea-based 鈥渢urn-on鈥?fluorescent sensor for detection of Fe³⁺/F^{鈭?/sup> ions with high selectivity and sensitivity}

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• 作者：Xingxing WuAuthor Vitae ; Qingfen Niu ; ^{qf_niu1216@qlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Tianduo Li ; ^{litianduo@163.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Urea ; Turn-on fluorescent sensor ; Iron ion ; Fluoride ion
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：222
• 期：Complete
• 页码：714-720
• 全文大小：1817 K

文摘

A novel urea-based “turn-on” fluorescent sensor 1,3-bis(4-(tert-butyldimethylsilyloxy)phenyl)urea (TBSU) has been synthesized and its sensing properties are explored. This sensor exhibited highly selective and sensitive detection of Fe³⁺ and F⁻ ions in aqueous DMSO solution (DMSO/H₂O, 95/5, v/v) with a significant fluorescence and absorption enhancement. The 1:1 stoichiometric structure between TBSU and Fe³⁺ was adequately supported by Job-plot evaluation, optical titration and FT-IR analysis. The recognition process of the chemosensor TBSU for Fe³⁺ is chemically reversible on the addition of CN⁻ anion. The Fe³⁺/F⁻ detection was not affected by the coexistence of other competitive ions. In addition, the detection limit was found to be as low as 5.87 × 10⁻⁸ M for Fe³⁺ and 4.84 × 10⁻⁸ M for F⁻, respectively. Thus, TBSU could be a highly promising fluorescent sensor for the direct determination of Fe³⁺/F⁻ ions in aqueous DMSO medium.