Ferrocene derivatives 1, 2a, 2b and 5 act as electrochemical sensors of Mg2+ and Ca2+ ions in acetonitrile solution in concentrations as low as 10 mol%: a new redox peak appears in the cyclic voltammogram, anodically shifted by 160–360 mV, with no interference from a large excess of several other metal salts; the single crystal X-ray structure of ligand 5 is reported.
A. Chesney, M. R. Bryce, A. S. Batsanov, J. A. K. Howard and L. M. Goldenberg, Chem. Commun., 1998, 677 DOI: 10.1039/A800436F
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