A multi-channel sensor based on 8-hydroxyquinoline ferrocenoate for probing Hg(II) ion

• Published in: Talanta (Oxford) Vol. 84; no. 3; pp. 900 - 904
• Main Authors: Shi, Lei, Song, Wei, Li, Yang, Li, Da-Wei, Swanick, Kalen N., Ding, Zhifeng, Long, Yi-Tao
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.05.2011; Elsevier
• Subjects: 8-Hydroxyqinoline; Analytical chemistry; Carbon; Chemistry; Colorimetry; Complexation; Detection; Electrochemical methods; Electrodes; Exact sciences and technology; Ferrocene; Ferrocenes; Multi-channel sensor; Quenching (cooling); Screen-printed carbon electrode; Sensors; Spectrometric and optical methods; Multi-channel sensor; Screen-printed carbon electrode; Ferrocene; 8-Hydroxyqinoline; Shift; Water; Complexation; Multisensor; Electrochemical method; Ultratrace compound; Mercury II; Carbon electrode; Colorimetry; Chemical enrichment; Molecules; Absorption; Oxidation; Peak; Detection; Application
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2011.02.024

A new sensing molecule 8-hydroxyquinoline ferrocenoate ( Fc-Q) which combines ferrocene and 8-hydroxyquinoline moieties was synthesized and applied as a multi-channel sensor for the detection of Hg 2+ ion. Fc-Q can coordinate with Hg 2+ to give colorimetric, fluorescent and electrochemical responses. Upon complexation with Hg 2+ ion, the characteristic absorption peak is red-shifted (Δ λ = 45 nm), the fluorescent intensity is quenched at 303 nm, and the oxidation peak is cathodic shifted (Δ E 1/2 = −149 mV). Quantitatively analyzed Hg 2+ ions at the range of ppb level could be achieved by electrochemical response. For the practical application of sensing Hg 2+ in real world water, Fc-Q modified screen-printed carbon electrodes were obtained for facile, sensitive, and on-site analysis of Hg 2+.