A selective redox and chromogenic probe for Hg(II) in aqueous environment based on a ferrocene-azaquinoxaline dyad

Inorganic Chemistry
Fabiola ZapataPedro Molina

Abstract

A new chemosensor molecule 4 based on a ferrocene-azaquinoxaline dyad effectively recognizes Hg(2+) in an aqueous environment as well as Pb(2+) and Zn(2+) metal cations in CH(3)CN solution through three different channels. Upon recognition, an anodic shift of the ferrocene/ferrocenium oxidation peaks and a progressive red shift (Deltalambda = 112-40 nm) of the low energy band, in their absorption spectra, is produced. These changes in the absorption spectra are accompanied by color changes from orange to deep green, for Hg(2+), and to purple in the cases of Pb(2+) and Zn(2+). Remarkably, the redox and colorimetric responses toward Hg(2+) are preserved in the presence of water (CH(3)CN/H(2)O, 3/7). The emission spectrum of 4 in CH(3)CN (lambda(exc) = 270 nm) undergoes important chelation enhancement of fluorescence (CHEF) in the presence of Hg(2+) (CHEF = 204), Pb(2+) (CHEF = 90), and Zn(2+) (CHEF = 184) metal cations. Along with the spectroscopic data, the combined (1)H NMR data of the complexes and the theoretical calculation suggest the proposed bridging coordination modes.

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Citations

Jan 26, 2013·Inorganic Chemistry·Nabanita SadhukhanJitendra K Bera
Mar 16, 2013·Rapid Communications in Mass Spectrometry : RCM·Xiaoji CaoWeimin Mo
Apr 9, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Shu-Pao WuYi-Ming Sung
Aug 18, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·María AlfonsoPedro Molina
Feb 23, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·María AlfonsoPedro Molina
Oct 25, 2012·Chemical Society Reviews·Robert D Hancock
Oct 19, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Pedro MolinaMaría Alfonso
Mar 21, 2017·Journal of Molecular Modeling·Arturo Espinosa Ferao, Rafaela García
Aug 12, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Suban K Sahoo

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