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Kinetics and mechanism of base-catalyzed hydrolysis of Cu(II)-malonamide complex

✍ Scribed by M. Arif Niaz; A. Aziz Khan

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
321 KB
Volume
23
Category
Article
ISSN
0538-8066

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✦ Synopsis

A kinetic study of base-catalyzed hydrolysis of Cu(I1)-malonamide complex has been performed in sodium hydroxide solution (0.2-1.25M). The reaction follows an irreversible firstorder consecutive path:

The variation of kl* and kZhs with alkali concentration was found to be in good agreement with the equations: l/kl* = BI + &/[OH] and l/kzobs = CI + Cz/[BH]

where B I , B z , C1, and Cz are empirical constants. The mechanism of hydrolysis of Cu(I1)malonamide complex has been discussed and rate equations have been derived. Retardation of rate of hydrolysis due to coordination of Cu(I1) with malonamide, in alkaline medium, has been explained in terms of comparatively slow breakdown of the C-N bond of the tetrahedral intermediate (TI). Thermodynamic parameters have also been evaluated.

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