Highly Selective Fluorescent Probe Based on 2‐(2′‐Dansylamidophenyl)‐Thiazole for Sequential Sensing of Copper(II) and Iodide Ions

Abstract

A novel highly selective fluorescent probe based on 2-(2 0 -dansylamidophenyl)-4-phenylthiazole (1) is developed for sequential sensing of copper(II) and iodide ions in acetonitrile. The fluorescence mechanism is based on cation-induced inhibition of excited-state intramolecular hydrogen transfer, intramolecular charge transfer, and metal-ligand electron/charge transfer. Subsequent iodide-induced extrusion of copper(II) results in partial revival of fluorescence. Probe 1 and its ensemble with copper (II) show high selectivity for copper(II) and iodide ions, respectively, in acetonitrile solution.

Construction of a Quinoline‐based Sequential Functioning Chromogenic Sensor for Copper(II) Ion and Biothiols: Its Application to Test Strips

“…17,18 They have advantages of being highly selective, simple and reacting quickly to analytes. 19,20 Therefore, many optical sensors for detecting various analytes have been addressed based on chromophores or fluorophores like quinoline, 21,22 BODIPY (Boron dipyrromethene difluoride), 23,24 coumarin, 25,26 NBD (Nitrobenzoxadiazole), 27,28 and rhodamine. 29,30 Especially, the sensors for relay sensing of metal ions and biothiols have attracted much attention.…”

“…Optical detection methods like chromogenic and fluorescence have been applied to the detection of a wide range of metal ions and bio‐molecules 17,18 . They have advantages of being highly selective, simple and reacting quickly to analytes 19,20 . Therefore, many optical sensors for detecting various analytes have been addressed based on chromophores or fluorophores like quinoline, 21,22 BODIPY (Boron dipyrromethene difluoride), 23,24 coumarin, 25,26 NBD (Nitrobenzoxadiazole), 27,28 and rhodamine 29,30 .…”

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

“…There are many methods with which to detect copper, such as flame atomic absorption spectroscopy, atomic absorption spectroscopy and inductively coupled plasma optical emission spectroscopy. Although many methods have the merit of being capable of determining low‐concentration samples at good levels of accuracy, some of these have major problems related to their cost, long analysis time and complicated operating processes for sample handling 16‐22 . Meanwhile, colorimetric chemosensors have key advantages of high sensitivity, eye‐catchingly fast detection and ease of use 23‐30 .…”

A pyridine‐dicarbohydrazide‐based chemosensor for detecting Al3+ by fluorescence turn‐on

“…[17][18][19] The tools for detecting aluminum ions include atomic emission spectroscopy, absorption spectroscopy, inductively coupled plasma-mass, and adaptive stripping voltammetry. [20][21][22] However, these tools have some disadvantages like high maintenance costs, complex processes, professional knowledge, and long response times. [23] Fluorescent detection methods have gained attention because they have operational simplicity, low-cost instrument, fast response time, low detection limit, and high selectivity.…”