A functionalized 1,1′-disubstituted ferrocene acts as an electro-optical ion-pair receptor for Mg2+, Ca2+, Cd2+, and Zn2+ cations in the presence of a co-bound H2PO4− anion, through perturbation of the redox potential of the ferrocene unit, enhancement of the fluorescence and a noticeable colour change.
M. D. C. González, F. Otón, A. Espinosa, A. Tárraga and P. Molina, Chem. Commun., 2013, 49, 9633 DOI: 10.1039/C3CC45707A
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