On the electrochemical reduction of some Cr(III) complexes inDMSO investigated by cyclic voltammetry |
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| Authors: | R Landsberg P Janietz M Prügel |
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| Institution: | (1) Sektion Chemie, Humboldt-Universität zu Berlin, DDR-108 Berlin, Germany;(2) Sektion NGW, Humboldt-Universität zu Berlin, DDR-104 Berlin, Germany |
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| Abstract: | The compounds investigated were: Cr(en)3]3+, Cr(ur)6]3+, Cr(DMSO)6]3+, Cr(dien)2]3+, Cr(en)2(acac)]2+, Cr(en) (acac)2]+ and Cr(acac)3.A distinctly different behaviour is caused by the introduction of one or moreacac ligands into the molecule. The first step is much more cathodic and quite irreversible, while it is reversible or quasi reversible for the first group of ions. This is due to a  -type interaction between theacac ligand and the central ion. This interaction is responsible for a third peak occurring for the second group of compounds and may be attributed to the reduction of the Cr(I) ion.Some correlations were found e.g. between the extinction of thed-d band of the first group of ions and the potential of the first peak, and the number ofacac groups introduced in the second group of compounds and the shift of the potential of the first peak.The determined electrochemical data are tabulated.
Untersuchungen zur elektrochemischen Reduktion einiger Cr(III)-Komplexe in DMSO mittels zyklischer Voltammetrie Zusammenfassung Die elektrochemischen Daten einer Reihe von Cr(III)-Komplexen miten-, ur-, DMSO-, dien- undacac-Liganden werden präsentiert und einige Möglichkeiten der Korrelation der physikalischen Eigenschaften der Komplexe werden aufgezeigt.Die erste Stufe bei der Einführung vonacac-Liganden ist auf Grund einer -Wechselwirkung zwischen Ligand und Zentralion irreversibel. |
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| Keywords: | Cr(III)complexes reduction Cyclic voltammetry |
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