Bis(ferrocenyl) derivatives 3a, 3c and 3d containing secondary chelating substituents act as efficient voltammetric sensors of Mg2+ and Zn2+ ions in acetonitrile solution in concentrations as low as 10 mol%: a new redox peak appears in the cyclic voltammogram, positively shifted by 170-225 mV for 3a, 160-175 mV for 3c and 160-170 mV for 3d. Compounds 3b and 4 are selective for Zn2+ (215 mV shift) and Mg2+ (205 mV shift) ions, respectively, whilst 3d is also responsive to Ca2+ ions (165 mV shift) with no interference from a large excess of several other metal salts. The X-ray crystal structure of 3a is also reported.
- chiral ligands
Sutcliffe, O. B., Bryce, M. R., & Batsanov, A. S. (2002). Synthesis of novel chiral bis(ferrocenyl) ligands and their use as voltammetric metal cation sensors. Journal of Organometallic Chemistry, 656(1-2), 211-216. https://doi.org/10.1016/S0022-328X(02)01593-0