A highly selective colorimetric and fluorescent probe for Cu2+ based diarylethene with a diaminomaleonitrile unit. (8th January 2021)

• Record Type: Journal Article
• Authors: Liu, Xutang; Liu, Hongliang; Tang, Xugang; Liu, Gang; Pu, Shouzhi
• Is Part Of: Tetrahedron. Volume 78(2021)
• Publication Date: 2021-01-08
• Subjects: Diarylethene -- Photochromism -- Diaminomaleonitrile -- Cu2+ recognition -- Colorimetric and fluorescent probe -- Test strip probe; Chemistry, Organic -- Periodicals; 547.005
• DOI: 10.1016/j.tet.2020.131788
• Languages: English
• ISSNs: 0040-4020

Abstract

Abstract: A novel photochromic diarylethene derivative containing a diaminomaleonitrile unit (1O ) was synthesized and its colorimetric and fluorescent turn-on sensing of Cu 2+ in acetonitrile solution was demonstrated. Both of its open- and closed-loop isomers (1O and 1C ) were highly selective for Cu 2+ with obvious absorption and color transforms. Moreover, the addition of Cu 2+ enhanced the fluorescence of 1O up to 174-fold with the concomitant color change from colorless to blue. The limit of detections (LODs) for Cu 2+ was determined to be 1.76 × 10 −8 mol L −1 . The stoichiometry of 1: 1 between the probe 1O and Cu 2+ was measured in Job's plot and ESI-MS. Most remarkably, the probe 1O could be used to detect Cu 2+ in test strip. Graphical abstract: Image 1 Highlights: A new asymmetrical photochromic diarylethene with a diaminomaleonitrile unit was synthesized successfully. This diarylethene could be used as a colorimetric and fluorescent probe for specific recognition of Cu 2+ ions. The sensor could be applied to qualitative detection of CN − on test paper strips.