Molecules, Vol. 29, Pages 1355: A & ldquo;Pincer & rdquo; Type of Acridine & ndash;Triazole Fluorescent Dye for Iodine Detection by Both & lsquo;Naked-Eye & rsquo; Colorimetric and Fluorometric Modes

In this study, we designed and synthesized a new pincer-type acridine–triazole fluorescent probe (probe 1) with an acridine ring as a spacer and a triazole as a linking arm attached to two naphthol groups. This probe can selectively recognize iodide ions in a mixed solvent of THF/H2O (v/v, 9/1), changing its color from colorless to light yellow, making it suitable for highly sensitive and selective colorimetric and fluorescent detection in water systems. We also synthesized another molecular tweezer-type acridine–triazole fluorescent probe (probe 2) that exhibits uniform detection characteristics for iodide ions in the acetonitrile system. Interestingly, compared to probe 2, probe 1 can be detected by the naked eye due to its circulation effect, providing a simple method for iodine detection. The detection limit of probe 1 is determined to be 10−8 mol·L−1 by spectrometric titration and isothermal titration calorimetry measurements. The binding stoichiometry between probe 1 and iodide ions is calculated to be 1:1 by these methods, and the binding constant is 2 × 105 mol·L−1.

Source: Molecules - March 19, 2024 Category: Chemistry Authors: Mei Yu Lu Jiang Lan Mou Xi Zeng Ruixiao Wang Tao Peng Fuyong Wu Tianzhu Shi Tags: Article Source Type: research