A multi-channel sensor based on 8-hydroxyquinoline ferrocenoate for probing Hg(II) ion
2011
Shi, Lei | Song, Wei | Li, Yang | Li, Da-Wei | Swanick, Kalen N. | Ding, Zhifeng | Long, Yi-Tao
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 Hg²⁺ ion. Fc-Q can coordinate with Hg²⁺ to give colorimetric, fluorescent and electrochemical responses. Upon complexation with Hg²⁺ ion, the characteristic absorption peak is red-shifted (Δλ=45nm), the fluorescent intensity is quenched at 303nm, and the oxidation peak is cathodic shifted (ΔE₁/₂=−149mV). Quantitatively analyzed Hg²⁺ ions at the range of ppb level could be achieved by electrochemical response. For the practical application of sensing Hg²⁺ in real world water, Fc-Q modified screen-printed carbon electrodes were obtained for facile, sensitive, and on-site analysis of Hg²⁺.
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