
TY  - JOUR
A1  - Beckham, KR 
A1  - Watts, DW 
T1  - Electron-Transfer Reactions in Non-Aqueous Media. IV. A Temperature-Dependence Study of the Reduction of CoCl(NH<sub>3</sub>)<sub>5</sub><sup>2+</sup> by Iron(II) in N,N-Dimethylformamide
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1979
VL  - 32
IS  - 7
SP  - 1425
EP  - 1431
KW  - 
UR  - https://doi.org/10.1071/CH9791425 
N2  - A detailed study has been made of the temperature dependence of the rate of reduction of CoCl-(NH3)52+ by iron(II) in N,N-dimethylformamide. The observed rate constants (kobs) for this reaction are complex functions of an equilibrium constant (K) for the formation of a bridged intermediate, the rate constant for electron transfer in this bridged intermediate (k), and the iron(II) concentration. From studies of the dependence of kobs on iron(II) concentration at five temperatures the temperature dependences of both K and k have been resolved, yielding respectively &#916;Hº -20k±12 kJ mol-1, &#916;Sº -44±40 J K-1 mol-1 and &#916;H* 107±4 kJ mol-1, &#916;S* 57±16 J K-1 mol-1. The results are interpreted in terms of a bridged intermediate in which the iron atom is tetrahedrally coordinated. 
ER  -

