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Voltammetric metal cation sensors based on ferrocene derivatives with oxazoline and imine substituents

Sutcliffe, O B and Chesney, A and Bryce, M R (2001) Voltammetric metal cation sensors based on ferrocene derivatives with oxazoline and imine substituents. Journal of Organometallic Chemistry, 637 (Specia). pp. 134-138. ISSN 0022-328X

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Abstract

Ferrocene derivatives la, lb and 2 containing oxazoline substituents act as efficient voltammetric 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, positively shifted by 310-360 mV for 1a and 1b, and by 160-190 mV for 2, compared to E-1/2 of the free ligand. For the bisferrocenyldiimine derivative 3 the shift is 150-160 mV. Compounds la, lb and 3 are also responsive to Cu2+ ions (shifts of 250, 320 and 160 mV, respectively) and compound 3 is responsive to Zn2+ ions (150 mV shift) with no interference from a large excess of several other metal salts. UV-vis spectrophotometric studies and H-1-NMR titration experiments confirm that the oxazoline or imine groups are the sites of metal complexation.