Colorimetric detection of Fe3+ and Fe2+ and sequential fluorescent detection of Al3+ and pyrophosphate by an imidazole-based chemosensor in a near-perfect aqueous solution. (April 2017)

• Record Type: Journal Article
• Authors: Jo, Tae Geun; Bok, Kwon Hee; Han, Jiyeon; Lim, Mi Hee; Kim, Cheal
• Is Part Of: Dyes and pigments. Volume 139(2017)
• Page Start: 136
• Page End: 147
• Publication Date: 2017-04
• Subjects: Multiple analytes -- Colorimetric -- Fluorescent -- Theoretical calculations -- Cell imaging; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.11.052
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A novel chemosensor was designed and synthesized for various analytes: Fe 3+, Fe 2+, Al 3+ and pyrophosphate. The sensor showed a selective color change from yellow to orange toward both Fe 3+ and Fe 2+ in a near-perfect aqueous solution, which could be reusable simply through treatment with ethylenediaminetetraacetic acid. The detection limits (0.27 μM and 0.32 μM) for Fe 3+ and Fe 2+ were much lower than the environmental protection agency guideline (5.37 μM) in drinking water. The sensor could be used to quantify Fe 3+ in real water samples. Moreover, this sensor acted as a 'turn-on' and 'turn-off' type fluorescent sensor toward Al 3+ and pyrophosphate. The sensing mechanism of the sensor for Al 3+ could be explained by chelation-enhanced fluorescence effect, which was supported by theoretical calculations. Through a metal-complex displacement method, the sensor-Al 3+ complex selectively responded to pyrophosphate over various anions especially including phosphate-based anions. Interestingly, the sensor could be used to sequentially detect both Al 3+ and pyrophosphate in the living cells. Graphical abstract: Highlights: New sensor1 was developed for colorimetric detection of Fe 2+ and Fe 3+ and fluorescent detection of Al 3+ and PPi. Sensor1 could selectively sense Fe 2+/3+ by color change from yellow to orange. Sensor1 could be used to quantify Fe 3+ in real water samples. 1 showed the sequential fluorescent imaging toward Al 3+ and PPi in living cells.