Hydrazine bridged coumarin-pyrimidine conjugate as a highly selective and sensitive Zn 2+ sensor: Spectroscopic unraveling of sensing mechanism with practical application

Thiocarbazone‐appended coumarin: An easily accessible ratiometric fluorescent chemosensor for multianalyte (Zn2+ and Cu2+) systems

“…Coumarin derivatives have been used extensively as fluorescent chemosensors for the detection of metal ions because of their excellent fluorescence properties, such as high fluorescence quantum yield, long emission wavelengths and photostability. 11,12 Until now, a large number of fluorescent probes based on coumarin have been reported for the individual detection of Cu 2+11, [13][14][15][16][17][18][19][20][21][22] or Zn 2+12, [23][24][25][26][27][28][29][30][31][32][33][34][35] (Table 1). In general, the coordination of probes with Zn 2+ and Cu 2+ would enhance and quench the fluorescence due to the chelation-enhanced fluorescence (CHEF) effect of Zn 2+ ions 23,[26][27][28][29][30][31][32][33][34][35] and the paramagnetic of Cu 2+ ions, 17,19,21,22 respectively.…”

A colorimetric chemosensor for selective detection of copper ions

“…Some particular moieties, like bipyridines, Schiff bases, guanidine and rhodamine dyes, are well known receptor‐chromophore systems that have been used for designing chemosensors 31–33 . In particular, chemosensors including Schiff bases have been actively studied due to their simple and easy synthesis, unique photochemical properties and excellent chelating ability to transition metal ions 34–37 . In this regard, we developed a Schiff base chemosensor with both outstanding chelating ability and a unique optical signal.…”

An efficient and sensitive chemosensor based on salicylhydrazide for naked-eye and fluorescent detection of Zn2+

“…As we all know, zinc(II) is the second most abundant and essential element aer iron ions (Fe 2+ and Fe 3+ ) in the human body and performs a variety of functions. [1][2][3] It is an integral part of numerous enzymes and plays a critical role in various biological processes, such as protein metabolism, the immune system, gene transcription and regulation. [4][5][6][7] The research on Zn 2+ has drawn considerable attention among biologists, chemists, environmentalists and pharmacologists for its chemical and physical properties.…”

“…Over the years, many uorescent chemosensors have been reported for the detection of Zn 2+ . Several Zn 2+ sensors have been developed based on different uorophores, such as quinoline, [22][23][24] uorescein, [25][26][27][28] coumarin, [29][30][31][32] peptide, 33 and pyrene. 34 However, most of them lack the smartness in Zn 2+ selectivity, sensitivity and interference resistance from Cd 2+ ion, 35,36 or there is a low yield resulting from complex purication protocols.…”