[S2], [S3], and [N3] coordination modes of hydrotris(thioxotriazolyl)borato. Zinc, nickel, cobalt, and bismuth complexes

The ligand hydrotris(1,4-dihydro-3-methyl-4-phenyl-5-thioxo-1,2,4-triazolyl)borato (Tr^Ph,Me) was synthetized as natrium salt and the complexes Zn(Tr^Ph,Me)₂] · 7.5H₂O · 1.5CH₃CN (2a), Zn(Tr^Ph,Me)₂] · 8DMF (2b), Co(Tr^Ph,Me)₂] · 8DMF (3a), Ni(Tr^Ph,Me)₂] · H₂O · 6DMSO (4a), Bi(Tr^Ph,Me)₂]NO₃ (5), have been isolated and structurally characterized by X-ray diffraction. In the zinc derivatives the ligand adopts different denticity and coordination modes, η² and S₂] for 2a and η³ and N₃] for 2b, depending on the crystallization solvent, giving rise to tetrahedral and octahedral geometry, respectively. In the octahedral cobalt and nickel complexes the ligand is η³ and N₃] coordinated whereas in the bismuth complex the η³ and S₃] coordination is exhibited.