Off-on fluorescent sensor based on the bis(2,4,7,8,9-pentamethyldipyrrolylmethene-3-yl)methane for detection of Cd²⁺ and Hg²⁺ cations

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• 作者：Natalia A. Bumagina^a ; ^{nad@isc-ras.ru} ; Elena V. Antina^a ; ^{eva@isc-ras.ru} ; Dmitry I. Sozonov^b ; ^{super_dk@mail.ru}
• 关键词：Bis(dipyrrin) ; Fluorescent sensor ; Cd2+ ions ; Hg2+ ions ; Selectivity ; Detection limit
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：183
• 期：Complete
• 页码：315-321
• 全文大小：907 K
• 卷排序：183

文摘

The off-on fluorescent chemosensor based on the bis(2,4,7,8,9-pentamethyldipyrrolylmethene-3-yl)methane for detection of Cd2+ and Hg2+ ions was obtained and its metal ion sensing properties were investigated. The bis(dipyrrin) exhibited remarkably fluorescence enhancement (150- and 40-fold) to Cd2+ and Hg2+ ions, respectively, with significant color change on the background of other metal ions in propanol-1/cyclohexane (1:30) binary mixture. Consequently, it can be used as a “naked eye” indicator with an obvious color change from yellow-orange to orange-green color upon the addition of Cd2+ and Hg2+. The fluorescent response mechanism of bis(dipyrrin) to Cd2+ and Hg2+ was based on the fluorescence enhancement effect upon complexation (CHEF) due to formation of a metal–ligand (2:2) complex [M2L2]. The detection limit of Cd2+ and Hg2+ ions was 2 × 10–9 and 1.7 × 10–8 M ions, respectively.