Department of Chemistry, University of Rajasthan, Jaipur-302004 Manuscript received 3 January 1977, revised 4 April 1977, accepted 20 May 1977 Cathodic redaction of mixed cadmium-pyridine-\(\gamma\)-picoline complexes has been studied at the d.m.e. It has been found to be reversible and diffusion controlled involving two electron reduction. Three mixed complexes having stoichiometry 1 : 1 : 1, 1 : 1: 2 and 1 : 2 : 1 are reported. The logarithm of overall formation constants \(\beta\)11,

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... )12 and \(\beta\)21 for the complexes [Cd(pyridine) (\(\gamma\)plcoline)]2+, [Cd(pyridine)(\(\gamma\)-picoline2)]2 and [CD pyridine),(7-picoline))2+ are 2.11, 2.57 and 2.78 respectively. The tendency of complex (simple and mixed) to add and substitute another ligand is discussed