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Extended viologen as a source of electric oscillations

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    0358314 - ÚFCH JH 2012 RIV GB eng J - Journal Article
    Pospíšil, Lubomír - Hromadová, Magdaléna - Fanelli, N. - Valášek, Michal - Kolivoška, Viliam - Gál, Miroslav
    Extended viologen as a source of electric oscillations.
    Physical Chemistry Chemical Physics. Roč. 13, č. 10 (2011), s. 4365-4371. ISSN 1463-9076. E-ISSN 1463-9084
    R&D Projects: GA ČR GA203/09/0705; GA AV ČR IAA400400802; GA MŠMT OC 140
    Institutional research plan: CEZ:AV0Z40400503; CEZ:AV0Z40550506
    Keywords : electrochemical oscillators * electrochemistry * simple model
    Subject RIV: CG - Electrochemistry
    Impact factor: 3.573, year: 2011

    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.
    Permanent Link: http://hdl.handle.net/11104/0196400

     
     
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