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Aquation of (N, Ndimethylformamide) pentaamminecobalt (III) perchlorate in aqueous perchlorate media

✍ Scribed by Warren L. Reynolds; Michael A. Knoll

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
331 KB
Volume
8
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The first‐order rate constants for aquation of Co(NH~3~)~5~(DMF)^3+^ were determined in aqueous perchlorate media. The rate constants were independent of hydrogen ion concentration and ionic strength, but decreased with increasing perchlorate ion concentration. Proton magnetic resonance studies showed that dimethylformamide was not hydrolyzed to formic acid and dimethylamine in the aquation step. Mass‐spectrometer studies showed that cobalt–oxygen bond breaking occurred in 98 percent, or more, of the aquation acts. Enthalpies and entropies of activation were determined. It was concluded that aquation occurred by an I~d~ mechanism.

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