Abstract
The green trans-dichlorobis(ethylenediamine)cobalt(III) chloride and the red cis-chloroisothiocyanotobis(ethylenediamine)cobalt(III) perchlorate were prepared and their purity was confirmed by measuring their isobestic point spectrophotometrically. Thermal and spectral behaviour of the two Co(III) complexes in the solid state and in molten KSCN and ZnCl 2KCl eutectic was studied. Results of thermogravimetric analysis showed a difference in decomposition temperature of the two complexes alone and in molten media. Moreover, the end product of the complexes alone was found to be Co 3O 4, but in thiocyanate melt CoS 2. Spectral measurements in the melts show characteristic absorption bands of tetrahedrally coordinated Co(II) suggesting the formation of [Co(NCS) 4] 2− and [CoCl 4] 2− species after oxidation—reduction reactions. Spectra in the solid state show the characteristic absorption of Co(III) in octahedral coordination.
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