Acid hydrolysis of carboxylatopentaamminecobalt(III) complexes Kinetics and mechanism of aquation of malonato, succinato, o-phthalato and o-methoxy benzoato pentaamminecobalt(III) complexes

Dash, A. C. ; Nanda, R. K. (1976) Acid hydrolysis of carboxylatopentaamminecobalt(III) complexes Kinetics and mechanism of aquation of malonato, succinato, o-phthalato and o-methoxy benzoato pentaamminecobalt(III) complexes Journal of Inorganic and Nuclear Chemistry, 38 (1). pp. 119-124. ISSN 0022-1902

Full text not available from this repository.

Official URL: http://linkinghub.elsevier.com/retrieve/pii/002219...

Related URL: http://dx.doi.org/10.1016/0022-1902(76)80062-0

Abstract

The kinetics of aquation of malonato, succinato, o-phthalato and o-methoxybenzoato pentaamminecobalt(III) complexes have been studied in aqueoys acidic media adjusted to 0.3 M ionic strength. At [H+] = 0.005 - 0.3 M and 55 - 70°C, the observed pseudofirst-order rate constants are described by the relationship: kobs = k1 + k2 [H+] where k1 and k2 stand for the rate constants of spontaneous and acid catalysed equation of (NH3)5CoCO2(CH2)nCO2H2+ (n = 1,2), (NH3)5CoCO2C6H4CO2H2+ and (NH3)5CoCO2C6H4OCH32+ species respectively. The rate and the activation parameters for the k1 and k2 paths have been determined. The results indicate that the unbound carboxyl group does not exert a specific catalytic effect on the spontaneous and acid catalysed paths of aquation of the cobalt(III) substrates derived from the dicarboxylic acids. Co---O bond fission appears to be rate limiting in both k1 and k2 paths of all complexes. The possibility of C---O bond breaking, however, can not be ruled out in the k2 path of the o-phthalato complex.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:9023
Deposited On:29 Oct 2010 11:57
Last Modified:30 May 2011 06:23

Repository Staff Only: item control page