Synthesis of 4‐dimethylaminobenzyl chrysin ester‐Zn fluorescent chemical sensor for the determination of Cr(VI) in water

Abstract

Cr(VI) is a type of dangerous effluent that has caused great harm to human health and the environment. Recognition and perception of Cr(VI) by artificial receptors has attracted extensive attention. A novel fluorescent chemical sensor based on the 5,7‐dihydroxyflavone skeleton was designed and synthesized for the selective recognition of Cr(VI). As confirmed by fluorescence technology, the fluorescent probe 4‐dimethylaminobenzyl chrysin ester–Zn (DBC–Zn) showed high sensitivity and selectivity for dichromate and a fast response (less than 30 sec) recognition. The fluorescence intensity of DBC–Zn varies linearly with the concentration of Cr(VI) in the range 0.1–1 μM. The detection limit of Cr2O72− by DBC–Zn is 2.3 nM, which is far lower than the national safe drinking water standard stipulated by the US Environmental Protection Agency (1.9 μM). The quenching mechanism of the probe can be attributed to the interaction of the dynamic quenching effect and the fluorescence internal filtration effect. In addition, the probe has good stability in both neutral and alkaline environments, and the accuracy of quantitative analysis of Cr2O72− in lake water or tap water is more than 80%. The test paper based on DBC–Zn can effectively detect Cr2O72− at the concentration of 100 ppb. This shows that the probe has a certain practical application value.

An ESIPT-based fluorescent probe for the detection of multiple analytes and a facile approach to discriminate between arsenate and pyrophosphate in water

“…Thus, the selective and sensitive detection of Cr 3+ ions in environmental and biological samples is required [18,19]. Although many chemical sensors for Cr 3+ have been designed, most of them are unsuccessful in detecting Cr 3+ ions in an aqueous medium, making them unsuitable for practical application [20][21][22][23][24][25][26][27][28][29].…”

“…18,19 Although many chemical sensors for Cr 3+ have been designed, most of them are unsuccessful in detecting Cr 3+ ions in an aqueous medium, making them unsuitable for practical applications. [20][21][22][23][24][25][26][27][28][29] Therefore, it is essential to design new water-friendly chemical sensors for the sensitive detection of Cr 3+ .…”