A highly sensitive colorimetric and fluorogenic detection of copper(II) ion based on new picolylamine-armed calix[4]arene

Tabakci, Begüm; Ozcelik, Egemen; Erdemir, Serkan; Tabakcı, Mustafa

doi:10.1016/j.measurement.2023.112556

Cited by 3 publications

(1 citation statement)

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“…More importantly, most other techniques rely on quite complex and time-consuming sensing procedures. For example, the method described by Tabakci B. and collaborators [ 56 ], which, however, presented a significantly higher LOD (5.1 µM and 0.96 µM) and a moderate linearity range, used the Cu(II)-picolylamine-armed calix [4]arene (4-PACX) complex formation and also included non-friendly solvents. The fluorescence detection of copper with OPD-derived carbon dots [ 30 ] required that the stock solutions of the Cu(II) ions were first diluted with 10 mM of phosphate-buffered saline (PBS) at pH 7.0 and then mixed with 10 mM PBS (pH 7.0) containing C dots for incubation at 37 °C for 1 h. Similarly, the remarkable LOD of 10 nM obtained with GSH-CdTe QDs [ 55 ] required semiconductor-based nanomaterials, which present high toxicity, intrinsic blinking, chemical instability, and insolubility in aqueous solution.…”

Section: Resultsmentioning

confidence: 99%

Colorimetric and Fluorescent Sensing of Copper Ions in Water through o-Phenylenediamine-Derived Carbon Dots

Pizzoferrato

Bisauriya

Antonaroli

et al. 2023

Sensors

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Fluorescent nitrogen and sulfur co-doped carbon dots (NSCDs) were synthesized using a simple one-step hydrothermal method starting from o-phenylenediamine (OPD) and ammonium sulfide. The prepared NSCDs presented a selective dual optical response to Cu(II) in water through the arising of an absorption band at 660 nm and simultaneous fluorescence enhancement at 564 nm. The first effect was attributed to formation of cuprammonium complexes through coordination with amino functional groups of NSCDs. Alternatively, fluorescence enhancement can be explained by the oxidation of residual OPD bound to NSCDs. Both absorbance and fluorescence showed a linear increase with an increase of Cu(II) concentration in the range 1–100 µM, with the lowest detection limit of 100 nM and 1 µM, respectively. NSCDs were successfully incorporated in a hydrogel agarose matrix for easier handling and application to sensing. The formation of cuprammonium complexes was strongly hampered in an agarose matrix while oxidation of OPD was still effective. As a result, color variations could be perceived both under white light and UV light for concentrations as low as 10 µM. Since these color changes were similarly perceived in tap and lake water samples, the present method could be a promising candidate for simple, cost-effective visual monitoring of copper onsite.

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Section: Resultsmentioning

confidence: 99%