About: Helquats, helical extended diquats, as fast electron transfer systems

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Helicene-viologen structural hybrids, like [5]helquat, 6,7,10,11-tetrahydrodipyrido[2,1-a:1',2'-k][2,9]phenanthrolinediium, and its four methylated derivatives, are characterized by electrochemical admittance and EPR spectroscopy. All compounds are reversibly reduced in two one-electron steps. Formal redox potentials correlate with the calculated LUMO energies. The electron transfer is coupled with a weak adsorption of the reactants. The analysis of the frequency dependence of the electrode admittance is used for the separation of Faradaic and double layer contributions and finally to the estimation of heterogeneous rate constants. Heterogeneous rate constants determined this way are in the range 0.1 to 3 cm s(-1). In all cases the second electron transfer is faster than the first redox step by a factor of three. The Frumkin correction for the acceleration by the double layer potential further amplifies this difference. Helicene-viologen structural hybrids, like [5]helquat, 6,7,10,11-tetrahydrodipyrido[2,1-a:1',2'-k][2,9]phenanthrolinediium, and its four methylated derivatives, are characterized by electrochemical admittance and EPR spectroscopy. All compounds are reversibly reduced in two one-electron steps. Formal redox potentials correlate with the calculated LUMO energies. The electron transfer is coupled with a weak adsorption of the reactants. The analysis of the frequency dependence of the electrode admittance is used for the separation of Faradaic and double layer contributions and finally to the estimation of heterogeneous rate constants. Heterogeneous rate constants determined this way are in the range 0.1 to 3 cm s(-1). In all cases the second electron transfer is faster than the first redox step by a factor of three. The Frumkin correction for the acceleration by the double layer potential further amplifies this difference. (en)
Title	Helquats, helical extended diquats, as fast electron transfer systems Helquats, helical extended diquats, as fast electron transfer systems (en)
skos:prefLabel	Helquats, helical extended diquats, as fast electron transfer systems Helquats, helical extended diquats, as fast electron transfer systems (en)
skos:notation	RIV/61388955:_____/10:00341536!RIV11-GA0-61388955
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA203/09/0705), P(GP203/09/P502), P(ME09114), P(OC 140), Z(AV0Z40400503), Z(AV0Z40550506)
http://linked.open...iv/cisloPeriodika	7
http://linked.open...vai/riv/dodaniDat	2011
http://linked.open...aciTvurceVysledku	Pospíšil, Lubomír Gál, Miroslav Horáček, Michal
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyzikální chemie J. Heyrovského AV ČR, v.v.i.
http://linked.open...dnocenehoVysledku	261360
http://linked.open...ai/riv/idVysledku	RIV/61388955:_____/10:00341536
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	reversible redox systems; self-exchange kinetics; methyl viologen (en)
http://linked.open.../riv/klicoveSlovo	methyl viologen reversible redox systems self-exchange kinetics
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[895B091C823A]
http://linked.open...i/riv/nazevZdroje	Physical Chemistry Chemical Physics
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Transfer of charge in single and assembled molecules Electrochemical Study of Redox Reactions of Radiosensitizers: Drugs that Make Radiation Work Better in Destroying Cancer Cells http://linked.opendata.cz/resource/domain/vavai/projekt/OC%20140 Collaboration in Energy and Nanoscience
http://linked.open...UplatneniVysledku	2010
http://linked.open...v/svazekPeriodika	12
http://linked.open...iv/tvurceVysledku	Adriaenssens, Louis Gál, Miroslav Pospíšil, Lubomír Severa, Lukáš Teplý, Filip Horáček, Michal
http://linked.open...ain/vavai/riv/wos	000274243200015
http://linked.open...n/vavai/riv/zamer	Struktura, reaktivita a dynamika molekulárních a biomolekulárních systémů: teorie, experiment, aplikace Regulace biologických procesů: Chemické modulátory vybraných systémů významných pro medicínu a zemědělství
issn	1463-9076
number of pages	7 (xsd:int)

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