Polarography of some Trans-Acidoaminebis(dimethylglyoximato)cobalt(III) complexes

Add time:08/26/2019    Source:sciencedirect.com

A series of neutral cobaloximes of the type Co(DH)2(B)(X) (where DH− = dimethylglyoximate anion, B = pyridine, ammonia or aniline, X− = 1−, Br−, Cl−, N−3 and NO−2 have been studied polarographically. In aqueous neutral solution, two one electron waves which correspond to the redox couple Co(III) → Co(II) and Co(II) → Co(I) are observed. In all the cases, the first wave is irreversible. There is a correlation between the first E12 and the ligand basicity. The established polarographic stability order of the ligands i.e., I− ∼ Br− ∼ Cl−, SCN− < N−3 < NO−2, is observed for the trans-acidopyridinecobaloximes. At low pH, the first E12 is shifted towards more positive potentials. This is attributed to the protonation of the complexes. Electrode kinetic data, computed using Koutecky's analysis, are also prevented.

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