A diarylethene based multi-functional sensor for fluorescent detection of Cd2+ and colorimetric detection of Cu2+. (February 2019) - Liu, Hongling
Abstract: A diarylethene based multi-functional sensor has been designed and synthesized. It not only exhibited excellent photochromism, but also has recognition performance for Cd 2+ and Cu 2+ . Upon addition of 7.0 equiv. Cd 2+, its emission intensity enhanced 106-fold, and the fluorescent color changed from dark to blue. Meanwhile, it also displayed colorimetric sensing ability to Cu 2+ with the solution color changed from colorless to yellow, that could be observed by the naked eyes. The 1: 1 stoichiometry between the sensor and the two ions was verified by Job's plot and MS. The LOD for Cd 2+ and Cu 2+ was determined to be 1.89 × 10 −7 mol L −1 and 4.12 × 10 −8 mol L −1, respectively. Furthermore, the sensor was successfully applied in the detection of Cd 2+ and Cu 2+ in practical samples. Graphical abstract: A diarylethene based multi-functional sensor for fluorescent detection of Cd 2+ and colorimetric detection of Cu 2+ has been synthesized. The sensor could be applied to detect Cd 2+ and Cu 2+ in practical samples with high accuracy. Highlights: This article reports a multi-functional sensor based on diarylethene and phthalimide unit for the first time. The sensor could act as a fluorescent sensor for detecting Cd 2+ and a colorimetric sensor for detecting Cu 2+ . The sensor could be applied to detect Cd 2+ and Cu 2+ in practical samples with high accuracy.