Highly sensitive cyanide anion detection with a coumarin–spiropyran conjugate as a fluorescent receptor

Abstract

A coumarin-spiropyran conjugate (2) shows a CN(-)-selective fluorescence enhancement under UV irradiation. This enables accurate determination of very low levels of CN(-) (>0.5 μM).

Molecular switches as photocontrollable “smart” receptors

“…5) is a structure developed recently and it is a selective sensor for cyanide. 77 The mechanism of interaction with the anion is the same as for compound 45a but the presence of a coumarin half represents an improvement in its sensitivity. The presence of [CN] À in À titration via emission spectroscopy with a detection limit of 0.5 mM which is a sharp improvement with respect to the value of 100 mM obtained with 45a.…”

A colorimetric chemosensor for the sequential detection of copper(II) and cysteine

“…Thus, based on the result of UVvis titration, the detection limit for Cys was determined to be 10.77 µM on basis of 3σ/K (Fig. S9) [54], suggesting that 1-Cu 2+ could be an excellent chemosensor for the detection of Cys.…”

“…Based on the result of UV-vis titration, the detection limit for 1-Cu 2+ complex was determined to be 2.4 µM on basis of 3σ/K (Fig. S3) [54]. Importantly, the value (2.4 µM) for Cu 2+ is much below the World Health Organization (WHO) guideline (30 µM) in the drinking water [10,11], suggesting that 1 could be a powerful chemosensor for the detection of copper in the drinking water.…”

One diethylamine coumarin derivative with nitro substituted chalcone structure as chemosensor for cyanide and copper ions

“…For the past few years, due to the important roles in biological, industrial and environmental processes of cyanide and copper ions, the study of optical chemosensors for cyanide [1][2][3][4][5][6][7][8][9][10] and copper ions [11][12][13][14][15][16] has attracted more and more attention of many chemists. As we all know, cyanide is a highly toxic compound and the lethal to human is minimal [17].…”