Studies of Copper(II) Thiosemicarbazide Complexes and their Reactivities. X-Ray Structure of Two Unusual Reaction Products, [Cu(bpy)(H2O)2SO4] and [(bpy)2Cu2(C2O4)Cl2]·H2O
A number of ternary complexes of Cu2+ with thiosemicarbazide (TSC) including [Cu(bpy)(TSC)2]Cl2, [Cu(o-phen)(TSC)2]Cl2 and [Cu(bpy)(TSC)2][CuCl4] [Cu(o-phen)(TSC)2] [CuCl4] have been synthesised and characterized. Their reactivities in aqueous and DMF solutions were studied. It was observed that while on coordination to Cu2+ thiosemicarbazide is converted to thiocyanate in aqueous solution, in DMF solution the thiocyanate is further aerially oxidised to sulfate. In the presence of hydrogen peroxide, oxidation to sulfate is rapid and from the mother liquor we could isolate [(bpy)2Cu2(C2O4)Cl2]·H2O whose structure was determined by X-ray crystallography. X-ray crystal structure of [Cu(bpy)(H2O)2SO4] is also discussed.*
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