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Kinetics and mechanism for the aquation of bismalonatoethylenediaminecobaltate(III) ion in acid perchlorate media
S DAS, S BHATTACHARYA, R N BANERJEE, D BANERJEA
Published in Kluwer Academic Publishers
1982
Volume: 7
   
Issue: 5
Pages: 249 - 252
Abstract
The title complex aquates in acid media, first to [Co(mal)-(H2O)2(en)]+ (1) (Step 1) and subsequently to [Co(H2O)4(en)]3+(2) (Step 2). Complex species (1) has been separated and characterised in solution. While Step 1 involves only a second-order acid catalysed path, Step 2 involves both a first-order acid independent path and a second-order acid catalysed path. The rate constants and activation parameters evaluated for these reaction paths have been compared with those for similar carboxylato-cobalt(III) complexes. This, together with an observed isokinetic relation, indicates that the rate-determining step involves opening of the unprotonated (in the spontaneous acid independent path) or the protonated (for the acid catalysed path) chelate ring of the malonate ligand and insignificant solvation of the central metal ion. © 1982 Verlag Chemie GmbH.
About the journal
JournalTransition Metal Chemistry
PublisherKluwer Academic Publishers
ISSN0340-4285