Preparation of Cobalt (III) complexes with trans-1,2-diaminocyclohexane N,N,N,N-tetra acetatic acid (CDTA) and ethylenediamine tetraacetic acid (EDTA)

The preparation and isolation of complexes trans 1,2 diaminocyclohexane N, N, N’, N’- tetraacetato cobalt (III) [Co(CDTA)] - and ethylenediamine-tetraacetato cobaltate (III) [Co(EDTA)]- by direct oxidation of cobalt (II) with peroxodisulfate ion in the presence of Ag+ ion as a catalyst is being reported. The stoichiometry of the complexes has been confirmed through spectroscopic techniques i.e. UV-Visible, Infrared and Atomic Absorption Spectroscopy. The complexes were found to have similar analytical values, further to confirm the procedure the complex of Co (III) EDTA was first prepared, isolated and analyzed to confirm the structural formula, Co (CDTA)- was also studied as comparatively. The approach was set to characterize compounds as expected to have the molecular formula, K[Co(CDTA)} – xH₂O in crystal form and [Co(CDTA}- in ionic form.

Key words: Isolated complexes, redox reactions, infrared (IR) spectroscopy, peroxodisulfate protonation.

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African Journal of Pure and Applied Chemistry

Preparation of Cobalt (III) complexes with trans-1,2-diaminocyclohexane N,N,Nâ€™,Nâ€™-tetra acetatic acid (CDTA) and ethylenediamine tetraacetic acid (EDTA)

Abida Perveen

Teimoor Nezamoleslam

Iftikhar Imam Naqvi

African Journal of
Pure and Applied Chemistry