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Issue 10, 2011
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Extended viologen as a source of electric oscillations

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A long organic molecule 1 with five bipyridinium functions separated by benzene rings (extended viologen) undergoes a reversible multi-step electron transfer. Here we show that this decacation accepts electrons at the heterogeneous interface with the occurrence of the periodically changing electric reduction currents. According to the applied bias voltage the observed current–time dependence changes from chaotic through periodic and irregular to sinusoidal and finally to monotonous. A careful choice of the controlling parameters yields the sustained periodic sinusoidal currents lasting for a prolonged time. Oscillations stem from a mutual interplay of the heterogeneous supply of electrons and the homogeneous redox reactions (disproportionation) between the transient redox forms. In difference to many other electrochemical oscillating systems the described oscillations do not require any additional external impedance. The principle of these oscillatory currents may serve as a model of a truly ‘molecular oscillator’.

Graphical abstract: Extended viologen as a source of electric oscillations

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Article information

14 Sep 2010
04 Jan 2011
First published
19 Jan 2011

Phys. Chem. Chem. Phys., 2011,13, 4365-4371
Article type

Extended viologen as a source of electric oscillations

L. Pospíšil, M. Hromadová, N. Fanelli, M. Valášek, V. Kolivoška and M. Gál, Phys. Chem. Chem. Phys., 2011, 13, 4365
DOI: 10.1039/C0CP01810D

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