The 12-tungstocobaltate(III/II) redox couple, both oxidation states being highly negatively charged (5-/6-), is strongly influenced by the nature of the counterion present. In particular, tetraalkylammonium ions decrease E-degrees[Co(III)/(II)] significantly, relative to that measured in the presence of alkali-metal ions in an organic solvent such as acetonitrile, thus causing large decreases in redox reactivity with respect to oxidation. An increasing proportion of water in the solvent increases E-degrees. The redox properties of the hexachloroiridate(IV)/(III) couple are affected by cations in a similar way.
STRONG MEDIUM AND COUNTERION EFFECTS UPON THE REDOX POTENTIAL OF THE 12-TUNGSTOCOBALTATE(III/II) COUPLE / Carloni, Patricia; L., Eberson. - In: ACTA CHEMICA SCANDINAVICA. - ISSN 0904-213X. - STAMPA. - 45:(1991), pp. 373-376. [10.3891/acta.chem.scand.45-0373]
STRONG MEDIUM AND COUNTERION EFFECTS UPON THE REDOX POTENTIAL OF THE 12-TUNGSTOCOBALTATE(III/II) COUPLE
CARLONI, PATRICIA;
1991-01-01
Abstract
The 12-tungstocobaltate(III/II) redox couple, both oxidation states being highly negatively charged (5-/6-), is strongly influenced by the nature of the counterion present. In particular, tetraalkylammonium ions decrease E-degrees[Co(III)/(II)] significantly, relative to that measured in the presence of alkali-metal ions in an organic solvent such as acetonitrile, thus causing large decreases in redox reactivity with respect to oxidation. An increasing proportion of water in the solvent increases E-degrees. The redox properties of the hexachloroiridate(IV)/(III) couple are affected by cations in a similar way.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
