A colorimetric and fluorometric investigation of Cu(ii) ion in aqueous medium with a fluorescein-based chemosensor

Abstract

A colorimetric and fluorometric chemosensor, 1,4-bis(1-fluorescein)-2,3-diaza-1,3-butadiene (L, 3) as Schiff base is developed for naked-eye detection of Cu2+ ion in aqueous medium due to the formation of a 1 : 1 copper–ligand complex.

A fluorescent sensor for Cu2+and Fe3+based on multiple mechanisms

“…Exposure to a high level of Cu 2+ could cause a wide variety of symptoms (gastrointestinal disease, Wilson's disease, dyslexia, hypoglycemia, and infant liver damage). [12][13][14][15][16][17] Thus, the detection of Cu 2+ from various sources including those in waste water outlets, electroplating waste and other metal processing industries is important. Cu 2+ complexation was well known to induce intrinsic fluorescence quenching, [18][19][20][21][22][23][24] while chemosensors with fluorescence enhancement were more encouraging because of their simplicity in practical applications.…”

Pyrene‐based Schiff Base as Selective Chemosensor for Copper(II) and Sulfide Ions

“…Colorimetric assay is considered to be superior as it consents the naked‐eye recognition through the sharp color alteration of the analyte devoid of any instrumentation with sophisticated sensitivity . Besides, fluorometric approach is also advantageous due to easy signal read out and penetrating sensitivity . Usually, fluorescence is quenched with added Cu 2+ ion because of its paramagnetism .…”

A bifunctional sensor based on diarylethene for the colorimetric recognition of Cu2+ and fluorescence detection of Cd2+

“…Compared to the abovementioned methods, chemosensing as one of the most promising approaches has attracted more attention due to its advantages of a fast response, high sensitivity, high selectivity, and real-time analysis. 29,30 Up to now, great efforts have been devoted to develop highly selective and sensitive chemosensors for the detection of heavy metal ions. Although sensors for the colorimetric recognition of Cu 2+ (ref.…”