A fluorescence “turn-on” chemodosimeter for Cu2+ in aqueous solution based on the ion promoted oxidation

Abstract

We developed a novel method for Cu(2+) detection based on the ion promoted oxidation reaction. Chemodosimeter L (weak fluorescence) can be oxidized into 3-benzothiazoly-7-N,N-diethylaminocoumarin (strong green fluorescence, coumarin 6) by Cu(2+) with high selectivity and sensitivity in HEPES (10 mM, pH = 7.4) buffer containing 50% (v/v) water-CH(3)CN solution.

A new rhodamine-based colorimetric chemosensor for naked-eye detection of Cu 2+ in aqueous solution

“…On the other hand, Cu 2+ is not only a significant metallic pollutant, but also an essential element for living organisms. [3][4][5][6] So far, many progress has been achieved in the creation of a chemosensor for Cu 2+ , [7][8][9][10][11][12][13][14][15][16][17][18] however there is still room to develop easy-to-make, simple-to-use and observable colorimetric sensors for Cu 2+ in aqueous solution. Work related to this area is of great challenge and increasing interest.…”

Luminescent sensor for copper(II) ion based on imine functionalized monometallic rhenium(I) complexes

“…Sb was determined from the emission intensity of the sensor solution in the absence of metal ions by performing a series of five measurements. The detection limit was calculated from the calibration plot and the values are collected in Table 3 [72,73]. The detection limit for complexes 1-4 was found to be in the range of 1.2 × 10 -6 -4.3 × 10 -6 M. The detection limit for complex 1 (4.3 × 10 -6 M) was higher compared to complex 4 (1.2 × 10 -6 M),…”

Design of a novel coumarin-based multifunctional fluorescent probe for Zn2+/Cu2+/S2− in aqueous solution

“…Upon addition of Zn 2+ , the proton peak of the -CO-NH at 12.12 ppm disappeared. This was possible because addition of Zn 2+ to HL caused the enolization of -CO-NH (COH_N) [47] and the loss of the -OH proton with subsequent binding to electron deficient Zn 2+ , the signals (8,9) were shifted to low-field compared to that in the 1 HNMR spectrum of the parent ligand HL which were attributed to the binding mode of Zn 2+ and the oxygen of -COO and the nitrogen atom of the -C_N, in addition, the aryl protons also have different changes in chemical shift. Therefore, the large differences of the 1 H NMR spectra of HL in the absence and presence of Zn 2+ , coupled with ESI-MS and Job's plot analysis, suggested that HL chelated Zn 2+ through interactions with the oxygen of -COO, the nitrogen atom of the -C_N and oxygen of the COH_N and forms 1:1 complex.…”

“…They play some critical roles in a variety of biological process such as gene transcription, regulation of metalloenzymes, and neural signal transmission in the human body [4][5][6][7][8]. Hence, a quantity of Zn 2+ and Cu 2+ is essential and beneficial for our good health.…”