Octahedral cobalt(III) complexes of the chloropentammine type. Part IV. The hydrolyses of cis-chloroallylamine- and cis-chloropropargylamine-bis(ethylenediamine)cobalt(III) cations
- 1 January 1966
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 138-142
- https://doi.org/10.1039/j19660000138
Abstract
Salts of the cis-chloroallylamine- and cis-chloropropargylamine-bis(ethylenediamine)cobalt(III) cations have been characterised. The first-order rate constants and the activation energies for their solvolytic aquation have been measured. Steric factors have most influence on the rate of reaction. For the allylamine complex, a unimolecular mechanism is assigned. The molecularity of the reaction with the propargylamine complex cannot be conclusively established, although activation energies make probable an SN1 mechanism. The second-order rate constants for the hydrolysis of these cations by base have also been determined at 0° and ionic strength of 0·1M. These results are discussed in terms of an ion-pair mechanism and conclusions similar to those for the solvolytic aquation are obtained.Keywords
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