Study of Some Cyano-Metal Complexes by Nuclear Magnetic Resonance. II. Kinetics of Electron Transfer between Ferri- and Ferrocyanide Ions

M. Shporer, G. Ron, A. Loewenstein, G. Navon

Research output: Contribution to journalArticlepeer-review

Abstract

The kinetics of the electron-transfer reaction between Fe(CN)6-3 and Fe(CN)6-4 ions in aqueous solutions was studied by measuring the N14 n.m.r. line width. The reaction obeys a rate equation: rate = k[Fe(CN)6-3] [Fe(CN)6-4] with k = 9.2 ± 1.3 × 104 sec.-1 M-1 at 32° and an Arrhenius activation energy of 4.2 kcal./mole in the temperature range 25-40°. The effect of replacing the potassium by other alkali and alkaline earth cations is reported. The rate increases from H+ to Cs+ and from Mg+2 to Sr+2. Possible mechanisms, in view of the catalytic effect of the cations, are discussed. The effect of the presence of various cations on the N14 line width is reported and discussed.

Original languageEnglish
Pages (from-to)361-364
Number of pages4
JournalInorganic Chemistry
Volume4
Issue number3
DOIs
StatePublished - 1 Mar 1965
Externally publishedYes

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