Effect of Transition Metal Ions on the Hydrolysis of the Methyl Derivatives of Salicylanil
Corresponding Author(s) : N.B. Laxmeshwar
Asian Journal of Chemistry,
Vol. 9 No. 1 (1997): Vol 9 Issue 1
Abstract
The catalytic effect of Ni(II), Zn(II) and Cu(II) ions on the hydrolysis
of the methyl derivatives of salicylanil has been studied at pH-4.58 at 35ºC.
The hydrolysis follows the sequence meta > para > ortho in the absence
and presence of metal ions. The presence of metal ions accelerates the
hydrolysis rate according to the sequence Ni(II) > Zn(II) > Cu(II) which
is in accordance with the Irving and Williams order of stability constants
of metal chelates involving nitrogen and oxygen donor ligands. The initial
retardation of rate of hydrolysis observed at lower Cu(II) concentrations
has been explained as due to Jahn-Teller distortion of the metal complex
to achieve stability. A suitable reaction mechanism has been suggested for
the metal ion-catalysed hydrolysis of the imines under study.
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