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Issue 48, 2018
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Interaction of monohydrogensulfide with a family of fluorescent pyridoxal-based Zn(II) receptors

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Abstract

H2S and its conjugate base HS have recently gained increasing attention for their reactivity with bioinorganic targets. However, so far, stable adducts of bioinorganic compounds with H2S/HS are still scarce due to the propensity of sulfide to form insoluble metal sulfides. In this work, we studied the reactivity of HS with a family of fluorescent zinc complexes via a variety of spectroscopic techniques. The complexes selected for this study feature a pyridoxal moiety with different substituent groups on the ligand framework. Interaction of the complexes under investigation with HS results in the displacement of the coordinated ligand from the Zn center with the concomitant precipitation of ZnS in the case of complexes 1 and 3, whereas for complex 2 our data points to the coordination of HS to the metal center likely assisted by hydrogen bonding with the OH of the pyridoxal moiety. In the presence of HS, the fluorescence emission of complex 2 is enhanced, whereas the fluorescence emission of complexes 1 and 3 is quenched. The results highlight the potential of complex 2 to be implemented as a HS fluorescent sensor via a coordinative-based approach.

Graphical abstract: Interaction of monohydrogensulfide with a family of fluorescent pyridoxal-based Zn(ii) receptors

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Publication details

The article was received on 02 Oct 2018, accepted on 15 Nov 2018 and first published on 15 Nov 2018


Article type: Paper
DOI: 10.1039/C8DT03969K
Citation: Dalton Trans., 2018,47, 17392-17400
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    Interaction of monohydrogensulfide with a family of fluorescent pyridoxal-based Zn(II) receptors

    M. Strianese, M. Lamberti and C. Pellecchia, Dalton Trans., 2018, 47, 17392
    DOI: 10.1039/C8DT03969K

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