title: Unprecedented 1,3-diaza[3]ferrocenophane scaffold as molecular probe for anions.
abstract: 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(-), PhCO(2)(-), F(-), Cl(-), and Br(-) anions by the free receptor and the less basic anions Br(-), Cl(-), and NO(3)(-) by its monoprotonated form takes place by unusual redox-ratiometric measurements and spectroscopic ((1)H NMR and UV-vis) changes.
authors.affiliation: Departamento de Química Orgánica, Facultad de Química, Campus de Espinardo, Universidad de Murcia, E-30100 Murcia, Spain.
authors.forename: Antonia
authors.initials: A
authors.lastname: Sola
authors.forename: Raúl A
authors.initials: RA
authors.lastname: Orenes
authors.forename: María Ángeles
authors.initials: MÁ
authors.lastname: García
authors.forename: Rosa M
authors.initials: RM
authors.lastname: Claramunt
authors.forename: Ibon
authors.initials: I
authors.lastname: Alkorta
authors.forename: José
authors.initials: J
authors.lastname: Elguero
authors.forename: Alberto
authors.initials: A
authors.lastname: Tárraga
authors.forename: Pedro
authors.initials: P
authors.lastname: Molina
mesh_terms: D000838:Anions / Q000737:chemistry; D003124:Colorimetry; D005296:Ferrous Compounds / Q000737:chemistry*; D007536:Isomerism; D008958:Models, Molecular; D008968:Molecular Conformation; D015335:Molecular Probes / Q000737:chemistry*; D010084:Oxidation-Reduction; D013057:Spectrum Analysis
chemical_list: D000838:Anions; D005296:Ferrous Compounds; D015335:Molecular Probes