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Sensors 2014, 14(8), 14339-14355; doi:10.3390/s140814339

Nitrogen-Rich Multinuclear Ferrocenophanes as Multichannel Chemosensor Molecules for Transition and Heavy-Metal Cations

Departamento de Química Orgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 30100 Murcia, Spain
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Received: 1 July 2014 / Revised: 23 July 2014 / Accepted: 27 July 2014 / Published: 7 August 2014
(This article belongs to the Special Issue Molecular Sensing and Molecular Electronics)
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Abstract

[m.n] Multinuclear ferrocenophanes prepared by aza-Wittig reaction of bisiminophosphoranes derived from 1,1'-diazidoferrocene and isophthaladelhyde or 2,5-diformylthiophene, behave as efficient electrochemical and chromogenic chemosensor molecules for Zn2+, Pb2+, and Hg2+ metal cations. Whereas the OSWV of receptor 3, bearing two m-phenylene units in the bridges, display one oxidation peak, receptor 4 incorporating two thiophene rings in the bridges, exhibits two well-separated oxidation peaks. In both receptors only the addition of Zn2+, Pb2+, and Hg2+ metal cations induced a remarkable anodic shift of ferrocene/ferrocenium redox couple. Likewise, in the absorption spectra of these receptors the low energy band is red-shifted by Δλ = 165 − 209 nm, and these changes promoted a significant color changes which could be used for the naked eye detection of these metal cations. The coordination modes for two representative cases were unveiled by DFT calculations that show an unsual coordination in the [42Pb]2+ complex with the Pb2+ cation in a distorted cubic N4S4 donor cage. View Full-Text
Keywords: ferrocenophane; electrochemical sensing; chromogenic sensing; aldimine binding site; Zn(II) metal cations; Pb(II) metal cations; Hg(II) metal cations ferrocenophane; electrochemical sensing; chromogenic sensing; aldimine binding site; Zn(II) metal cations; Pb(II) metal cations; Hg(II) metal cations
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Sola, A.; Espinosa, A.; Tárraga, A.; Molina, P. Nitrogen-Rich Multinuclear Ferrocenophanes as Multichannel Chemosensor Molecules for Transition and Heavy-Metal Cations. Sensors 2014, 14, 14339-14355.

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