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Cobalt(III) complexes of thiophene-2-carboxyal-dehyda thiosemicarbazone (ligand), of general formulae, Co(ligand)2.X3, Co(ligand)X3.H2O (where X = NO− 3, Cl−, Br−, I− and CH3COO−) and Co(ligand-H)3 have been prapared and characterised. The complexes are diamagnetic. Ligand field parameters have been calculated from the electronic spectra. IR spectra show that the ligand acts as a bidantats. Octahedral geometry has been suggested for all these complexes.
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