Kinetics and mechanism of the electron-transfer reaction between chloropenta-amminechromium(III) ion and chromium(II) in acetate medium
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1098-1102
- https://doi.org/10.1039/j19680001098
Abstract
The CrII-catalysed decomposition of chloropenta-amminechromium(III) ion in an acetate buffer medium obeys the rate law d[Cr(OAc)3]/dt=k0[Cr(NH3)5Cl2+][CrII]½ T[OAc–]0, where k0= 0·58 ± 0·01 M–½ min.–1 at 25·0° and unit ionic strength (NaClO4). The corresponding activation energy is 14·2 kcal./mole. Evidence is presented for a reaction mechanism involving an unstable monomeric chromium(II) complex, probably Cr(OAc)3 –. The second-order rate constant for the reaction Cr(OAc)3 –+ Cr(NH3)5Cl2+ is approximately 70M–1 min.–1 under the conditions stated. The predominant dinuclear chromium(II)–acetate complex does not participate in the electron-transfer reaction.Keywords
This publication has 0 references indexed in Scilit: