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Issue 6, 2018
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A fluorescent turn-on probe for cyanide anion detection based on an AIE active cobalt(II) complex

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Abstract

A new tetradentate polypyridine ligand that displays aggregation induced emission (AIE) characteristics has been synthesized. A coordination complex with CoCl2 has been prepared and characterized by X-ray crystallography. The Co(II) complex retains the AIE activity of the ligand in aqueous solution while also exhibiting a selective turn-on fluorescence response in the presence of cyanide anion. A complex : CN binding stoichiometry of 1 : 2 was indicated via Job plot analysis and the limit of detection for CN was determined to be 0.59 μM. The fluorescence response is attributed to coordination of CN by the AIE active Co(II) complex, resulting in decreased solubility in aqueous medium and concomitant generation of larger nanoaggregates as revealed by dynamic light scattering (DLS) measurements. The sensitivity and selectivity displayed by this sensor for CN over other anions renders it a candidate probe for CN detection in aqueous environments.

Graphical abstract: A fluorescent turn-on probe for cyanide anion detection based on an AIE active cobalt(ii) complex

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Publication details

The article was received on 09 Nov 2017, accepted on 15 Jan 2018 and first published on 16 Jan 2018


Article type: Paper
DOI: 10.1039/C7DT04242F
Citation: Dalton Trans., 2018,47, 2079-2085

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    A fluorescent turn-on probe for cyanide anion detection based on an AIE active cobalt(II) complex

    M. T. Gabr and F. C. Pigge, Dalton Trans., 2018, 47, 2079
    DOI: 10.1039/C7DT04242F

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