A reversible fluorescence “off–on–off” sensor for sequential detection of aluminum and acetate/fluoride ions

• Published in: Talanta (Oxford) Vol. 144; pp. 80 - 89
• Main Authors: Gupta, Vinod Kumar, Mergu, Naveen, Kumawat, Lokesh Kumar, Singh, Ashok Kumar
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.11.2015
• Subjects: Acetates - analysis; Acetates - chemistry; Aluminum - analysis; Aluminum - chemistry; Anion; Binding, Competitive; Chemistry Techniques, Analytical - instrumentation; Chemosensor; Colorimetry; Fluorescence; Fluorescent Dyes - chemistry; Fluorides - analysis; Fluorides - chemistry; Hydrogen-Ion Concentration; Metal ion; Models, Molecular; Molecular Conformation; Reversibility; Rhodamines - chemistry; Schiff Bases - chemistry; Sequential detection; Spectrometry, Fluorescence; Temperature; Chemosensor; Fluorescence; Metal ion; Reversibility; Anion; Sequential detection
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2015.05.053

A new rhodamine functionalized fluorogenic Schiff base CS was synthesized and its colorimetric and fluorescence responses toward various metal ions were explored. The sensor exhibited highly selective and sensitive colorimetric and “off–on” fluorescence response towards Al3+ in the presence of other competing metal ions. These spectral changes are large enough in the visible region of the spectrum and thus enable naked-eye detection. Studies proved that the formation of CS–Al3+ complex is fully reversible and can sense to AcO−/F− via dissociation. The results revealed that the sensor provides fluorescence “off–on–off” strategy for the sequential detection of Al3+ and AcO−/F−. [Display omitted] •A new rhodamine functionalized fluorophore was synthesized.•Exhibited colorimetric and “off–on” fluorescence response towards Al3+.•Dissociation of probe–Al3+ complex involves the detection of AcO−/F−.•The sensor provides strategy for the sequential detection of Al3+ and AcO−/F−.