Selective and Sensitive Detection of Cyanide Based on the Displacement Strategy Using a Water-Soluble Fluorescent Probe. (5th January 2016)

• Record Type: Journal Article
• Authors: La, Ming; Hao, Yuanqiang; Wang, Zhaoyang; Han, Guo-Cheng; Qu, Lingbo
• Other Names: Ros-Lis Jose Vicente Academic Editor.
• Is Part Of: Journal of analytical methods in chemistry. Volume 2016(2016)
• Publication Date: 2016-01-05
• Subjects: Chemistry, Analytic -- Periodicals; Chemistry, Analytic -- Technique -- Periodicals; 543.05
• DOI: 10.1155/2016/1462013
• Languages: English
• ISSNs: 2090-8865

Abstract

Abstract : A water-soluble fluorescent probe (C -GGH) was used for the highly sensitive and selective detection of cyanide (CN − ) in aqueous media based on the displacement strategy. Due to the presence of the recognition unit GGH (Gly-Gly-His), the probeC -GGH can coordinate with Cu 2+ and consequently display ON-OFF type fluorescence response. Furthermore, the in situ formed nonfluorescentC -GGH-Cu 2+ complex can act as an effective OFF-ON type fluorescent probe for sensing CN − anion. Due to the strong binding affinity of CN − to Cu 2+, CN − can extract Cu 2+ fromC -GGH-Cu 2+ complex, leading to the release ofC -GGH and the recovery of fluorescent emission of the system. The probeC -GGH-Cu 2+ allowed detection of CN − in aqueous solution with a LOD (limit of detection) of 0.017 μ mol/L which is much lower than the maximum contaminant level (1.9 μ mol/L) for CN − in drinking water set by the WHO (World Health Organization). The probe also displayed excellent specificity for CN − towards other anions, including F −, Cl −, Br −, I −, SCN −, P O 4 3 -, N 3 -, N O 3 -, AcO −, S O 4 2 -, andC O 3 2 - .