A Highly Selective "On‐Off‐On" Optical Switch for Sequential Detection of Cu2+ and S2− Ions Based on 2, 6‐Diformyl‐4‐methyl Phenol and Catecholase Activity by Its Copper Complex. Issue 4 (29th January 2018)

• Record Type: Journal Article
• Authors: Parua, Sankar P.; Sinha, Debopam; Rajak, Kajal K.
• Is Part Of: ChemistrySelect. Volume 3:Issue 4(2018)
• Page Start: 1120
• Page End: 1128
• Publication Date: 2018-01-29
• Subjects: Catecholase activity -- Copper(II) recognition -- Fluorescent probe -- Logic gate and Sulphide recognition; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201702620
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: A new highly selective chemosensor for Cu 2+ and S 2− ions, Ethyl 2‐cyano‐3‐(2‐hydroxy‐5‐methyl‐3‐(p‐tolylimino)methyl)phenyl)acrylate) (HL) based on 2, 6‐diformyl‐4‐methylphenol was designed and synthesized. The ligand exhibited excellent sensitivity towards copper ion by the emission quenching even in the presence of other biologically important metal ions. Once HL combine with Cu 2+ it can display a rapid response and high selectivity toward sulfide anion resulting in off‐on sensing via Cu 2+ displacement assay. The signal transduction happen via reversible formation–separation of complex L–Cu and CuS and the complex L−Cu was synthesized by the reaction of HL and Cu 2+ and characterized by single‐crystal X‐ray diffraction and DFT optimization studies. The catecholase like activity for L−Cu complex have been studied by using 3, 5‐di‐tertbutylcatechol (3, 5‐DTBC) as the substrate. Abstract : A new highly selective colorimetric and fluorometric chemosensor HL conjugated with ethylcyano‐vinyl fragment has been developed as a promising analytical tool for successive recognition of Cu 2+ and S 2− ion.