Impressive spin-related effects are observed in cyclic voltammetry (CV) experiments performed under applied magnetic field on a non-ferromagnetic electrode modified with a thin electroactive oligothiophene film, either "inherently chiral" or featuring chiral pendants with stereogenic centres. By flipping the magnet north/south orientation, the CV peaks of two achiral, chemically reversible Fe(III)/Fe(II) redox couples in aqueous or organic solution undergo impressive potential shifts (up to nearly 0.5 V depending on protocol conditions), specularly by changing the film (R)- or (S)-configuration. The magnitude of the potential shift decreases both increasing the polymer film thickness and the distance between the permanent magnet from the electrode surface. Such unprecedented spin-related redox potential modulation, obtained in the absence of a magnetic electrode acting as spin injector, provides a striking evidence (as well as an attractive evaluation criterion) of the spin selectivity properties of chiral thin films.
Highlighting spin selectivity properties of chiral electrode surfaces from redox potential modulation of an achiral probe under applied magnetic field / T. Benincori, S. Arnaboldi, M. Magni, S. Grecchi, C. Fontanesi, P.R. Mussini. - In: CHEMICAL SCIENCE. - ISSN 2041-6520. - 10:9(2019 Jan), pp. 2750-2757. [10.1039/C8SC04126A]
Highlighting spin selectivity properties of chiral electrode surfaces from redox potential modulation of an achiral probe under applied magnetic field
S. Arnaboldi
;M. Magni
;S. Grecchi;P.R. Mussini
2019
Abstract
Impressive spin-related effects are observed in cyclic voltammetry (CV) experiments performed under applied magnetic field on a non-ferromagnetic electrode modified with a thin electroactive oligothiophene film, either "inherently chiral" or featuring chiral pendants with stereogenic centres. By flipping the magnet north/south orientation, the CV peaks of two achiral, chemically reversible Fe(III)/Fe(II) redox couples in aqueous or organic solution undergo impressive potential shifts (up to nearly 0.5 V depending on protocol conditions), specularly by changing the film (R)- or (S)-configuration. The magnitude of the potential shift decreases both increasing the polymer film thickness and the distance between the permanent magnet from the electrode surface. Such unprecedented spin-related redox potential modulation, obtained in the absence of a magnetic electrode acting as spin injector, provides a striking evidence (as well as an attractive evaluation criterion) of the spin selectivity properties of chiral thin films.File | Dimensione | Formato | |
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