[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 (TrPh,Me) was synthetized as natrium salt and the complexes [Zn(TrPh,Me)2] · 7.5H2O · 1.5CH3CN (2a), [Zn(TrPh,Me)2] · 8DMF (2b), [Co(TrPh,Me)2] · 8DMF (3a), [Ni(TrPh,Me)2] · H2O · 6DMSO (4a), [Bi(TrPh,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.