Cobalt(III) and chromium(III) complexes of thiosemicarbazide: the crystal structure of Λ-cis-tris(thiosemicarbazide)cobalt(III) chloride trihydrate

Summary Cobalt(III) and chromium(III) complexes of thiosemicarbazide (Htsc) were prepared and the structure of Co(Htsc)₃]Cl₃·3H₂O was determined by X-ray crystallography. The structure was solved by direct methods and refined by full matrix least squares to R = 0.035 for 2266 observed reflections. The metal has octahedral geometry with a cis arrangement of Htsc ligands. The Co(Htsc)₃]³⁺ cations within the unit cell are strongly hydrogen bonded through H₂O molecules with the hydrogen bonding nitrogen-oxygen distances between 2.807–2.937 Å.