A selective sulphur‐containing colorimetric chemosensor for Cu²⁺

Abstract

A highly selective sulphur‐containing colorimetric chemosensor APTS ((E)‐2‐(tert‐butyl)‐6‐(((2‐(phenylthio)phenyl)imino)methyl)phenol) was synthesised for detecting Cu2+. APTS showed a clear colour change from colourless to yellow with Cu2+. The detection limit of APTS for Cu2+ was 0.52 μmol/L. APTS could also be used as a test strip for detecting Cu2+. To understand the binding mode of APTS with Cu2+, ultraviolet‐visible spectroscopy and electrospray ionisation‐mass spectrometry analyses were conducted. The sensing mechanism of sensor APTS towards Cu2+ was proposed to be the combination of intramolecular charge transfer and ligand‐to‐metal charge‐transfer through theoretical calculations.

A New Chromone‐based Sequential Functioning Colorimetric Chemosensor for Cu2+ and Cysteine in Near‐perfect Aqueous Media

“…However, these methods have problems of low sensitivity, high‐priced equipment, and complicated analysis [7–11] . Meanwhile, optical detection methods like colorimetry have the advantages of being simple, sensitive, and cheap through immediate color variations [10,12–19] . For those reasons, it is needed to develop colorimetry sensors to simply detect metals or amino acids [20–23] …”

A Naphthol and Nitroaniline‐Based Dual‐target Chemosensorfor Fluorometric Sensing of Al3+ and Colorimetric Sensing of Fe3+

“…[23] In contrast, colorimetric and fluorescent chemosensors have great merits like high sensitivity, fast sensing, simplicity, and no need for expensive equipment. [24][25][26] Although many chemosensors detecting only Al 3 + or Fe 3 + have been reported, colorimetric and fluorescent sensors for recognition of both Al 3 + and Fe 3 + were rare. [27,28] Moreover, chemosensors that could detect Al 3 + and Fe 3 + with different responses are even uncommon.…”

“…However, these methods have disadvantages such as expensive cost, the need for trained operators, and complicated sample preparation [23] . In contrast, colorimetric and fluorescent chemosensors have great merits like high sensitivity, fast sensing, simplicity, and no need for expensive equipment [24–26] . Although many chemosensors detecting only Al 3+ or Fe 3+ have been reported, colorimetric and fluorescent sensors for recognition of both Al 3+ and Fe 3+ were rare [27,28] .…”

An effective colorimetric sensor for detecting Cu2+ based on benzothiazole moiety

“…Herein, we illustrate a colorimetric sensor HMD for Cu 2+ , which could be readily synthesised by condensation of benzothiazole and salicylaldehyde moieties. The sensor HMD showed both a large bathochromic shift (152 nm) and a definite colour change for Cu 2+ 38,39 . The practical utilisation of HMD was deemed highly practical in that test strips could be applied at low concentration among copper‐selective colorimetric chemosensors based on the benzothiazole moiety 40‐42 .…”