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Statements

Subject Item
n2:RIV%2F60461373%3A22310%2F06%3A00017013%21RIV07-GA0-22310___
rdf:type
skos:Concept n15:Vysledek
rdfs:seeAlso
www.electrochem.org
dcterms:description
Byla připraven a a elektrochemicky zkoumána série aminokarbenových komplexů chromu, wolframu a železa. Byly sledovány vlivy způsobu koordinace, substituce na fenylovém kruhu ligandu a centrálního kovového atomu jak na na oxidační, tak na redukční potenciál a závislosti byly vyhodnoceny metodou LFER. Rozdíl mezi hodnotami oxidačního a redukčního potenciálu odráží rozdíl energií HOMO a LUMO orbitalů. Redukce daných karbenových komplexů závisí především na povaze ligandu a jeho substituci, ale nezávisí na povaze centrálního kovu. Na druhou stranu oxidace je téměř nezávislá na substituci ligandu, ale silně ji ovlivňují povaha centrálního kovu a počet koordinovaných karbonylových skupin, tj. počet ligandů s π - akceptorovou schopností. Series of chromium, tungsten and iron aminocarbene complexes were prepared and electrochemically investigated. The influence of the type of coordination, of the substituent on the ligand phenyl ring and of the central metal atom on oxidation and reduction potentials was followed electrochemically using the Linear Free Energy Relationship (LFER) approach. The difference between the oxidation and reduction potentials reflects the energy of the HOMO-LUMO gap. The reduction of carbene derivatives strongly depends only on the nature of ligands and their substitution, but not on the nature of the central metal. On the other hand, the oxidation is practically independent of the ligand substitution, being influenced by both the nature of the central metal atom and the number of carbonyl groups (i.e. strong π-acceptors) present. Series of chromium, tungsten and iron aminocarbene complexes were prepared and electrochemically investigated. The influence of the type of coordination, of the substituent on the ligand phenyl ring and of the central metal atom on oxidation and reduction potentials was followed electrochemically using the Linear Free Energy Relationship (LFER) approach. The difference between the oxidation and reduction potentials reflects the energy of the HOMO-LUMO gap. The reduction of carbene derivatives strongly depends only on the nature of ligands and their substitution, but not on the nature of the central metal. On the other hand, the oxidation is practically independent of the ligand substitution, being influenced by both the nature of the central metal atom and the number of carbonyl groups (i.e. strong π-acceptors) present.
dcterms:title
M(0)-Aminokarbenové komplexy (M = Cr, W, Fe): Redox chování modifikované kovem a/nebo změnou ligandu. M(0) - Aminocarbene Complexes (M = Cr, W, Fe): Redox Behavior Tuned by Metal and/or Ligand Modification M(0) - Aminocarbene Complexes (M = Cr, W, Fe): Redox Behavior Tuned by Metal and/or Ligand Modification
skos:prefLabel
M(0)-Aminokarbenové komplexy (M = Cr, W, Fe): Redox chování modifikované kovem a/nebo změnou ligandu. M(0) - Aminocarbene Complexes (M = Cr, W, Fe): Redox Behavior Tuned by Metal and/or Ligand Modification M(0) - Aminocarbene Complexes (M = Cr, W, Fe): Redox Behavior Tuned by Metal and/or Ligand Modification
skos:notation
RIV/60461373:22310/06:00017013!RIV07-GA0-22310___
n3:aktivita
n4:P
n3:aktivity
P(GA203/04/0487)
n3:dodaniDat
n7:2007
n3:domaciTvurceVysledku
n8:3694291 n8:5078008
n3:druhVysledku
n10:A
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
487464
n3:idVysledku
RIV/60461373:22310/06:00017013
n3:jazykVysledku
n14:eng
n3:klicovaSlova
Fischer carbene complexes; LFER, electrochemical behaviour; polarography; cyclic voltammetry; redox potential; intramolecular electronic communication
n3:klicoveSlovo
n6:Fischer%20carbene%20complexes n6:cyclic%20voltammetry n6:electrochemical%20behaviour n6:redox%20potential n6:polarography n6:LFER n6:intramolecular%20electronic%20communication
n3:kodPristupu
n9:V
n3:kontrolniKodProRIV
[7EE49ADC6F61]
n3:mistoVydani
Philadelphia
n3:objednatelVyzkumneZpravy
The Electrochemical Society
n3:obor
n18:CG
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
4
n3:projekt
n11:GA203%2F04%2F0487
n3:rokUplatneniVysledku
n7:2006
n3:tvurceVysledku
Roháčová, Jana Dvořák, Dalimil Ludvík, Jiří Hoskovcová, Irena
n17:organizacniJednotka
22310