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Extended viologen as a source of electric oscillations

SYSNO ASEP	0358314
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Extended viologen as a source of electric oscillations
Author(s)	Pospíšil, Lubomír (UFCH-W)_{RID, ORCID} Hromadová, Magdaléna (UFCH-W)_{RID, ORCID, SAI} Fanelli, N. (IT) Valášek, Michal (UOCHB-X) Kolivoška, Viliam (UFCH-W)_{RID, ORCID} Gál, Miroslav (UFCH-W)
Source Title	Physical Chemistry Chemical Physics. - : Royal Society of Chemistry - ISSN 1463-9076 Roč. 13, č. 10 (2011), s. 4365-4371
Number of pages	7 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	electrochemical oscillators ; electrochemistry ; simple model
Subject RIV	CG - Electrochemistry
R&D Projects	GA203/09/0705 GA ČR - Czech Science Foundation (CSF)
	IAA400400802 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	OC 140 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z40400503 - UFCH-W (2005-2011)
	AV0Z40550506 - UOCHB-X (2005-2011)
UT WOS	000287584700022
DOI	10.1039/c0cp01810d
Annotation	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.
Workplace	J. Heyrovsky Institute of Physical Chemistry
Contact	Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196
Year of Publishing	2012

Number of the records: 1