Journal
INORGANIC CHEMISTRY
Volume 50, Issue 9, Pages 4212-4220Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic102314r
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Funding
- MICINN-Spain [CTQ2008-01402, CTQ2009-13129-C02-02, CTQ2010-16122]
- Fundacion Seneca (Agencia de Ciencia y Tecnologia de la Region de Murcia) [04509/GERM/06]
- Comunidad Autonoma de Madrid [S2009/PPQ-1533]
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The guanidine unit in the guise of 2-aminoimidazole in the new structural motif 2-arylamino-1,3-diaza[3]ferrocenophane 4 acts as a binding site for anions. The electrochemical behavior of this compound has been studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) and was found to exhibit a quasi reversible oxidation peak, associated to the Fe(II)/Fe(III) redox couple (Ep = 440 mV), and a non-reversible oxidation wave (Ep = 817 mV), probably associated to the oxidation of the C=N unit present in the guanidine bridge. Recognition of AcO-, PhCO2-, F-, Cl-, and Br- anions by the free receptor and the less basic anions Br-, Cl-, and NO3- by its monoprotonated form takes place by unusual redox-ratiometric measurements and spectroscopic (H-1 NMR and UV-vis) changes.
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