Abstract
Mixed ligand complexes of Co(ii), viz, [Co(tu) o-Phen 2Cl] Cl, [Co(tu)dipy 2Cl] Cl, [Co(tu)-(PhOAs) 2Cl] and [Co(tu) 2py 2Cl 2] were prepared by the interaction of the tetrahedral complex, [Co(tu) 2Cl 2], with hetrocyclic amines and phenyl arsonic acid, respectively. The complex species were characterized as 6-coordinate products by their magnetic susceptibilities and electronic absorption spectra. In the heterocyclic amine substituted products, the bonding through sulphur and tertiary nitrogen has been inferred on the basis of i.r. studies, which show the presence of M=S and M=O bonds in the complexes. Kinetic studies on the substitution reactions involving the formation of the above mentioned species were carried out potentiometrically using AgAg 2S as an indicator electrode. They indicate a second order overall process, first order with respect to both of the reactants.
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