Novel vanadium(iii/iv) compounds with the diamidate ligand 1,2-bis(2-pyridinecarboxamide)benzene (H2bpb)

Reaction of the diamidate ligand H2bpb with VCl3 depending on the base affords either the compound NHEt3{trans-[VIIICl2(bpb)] } 1 or [VIII(Hbpb)3]·2CHCl3 2; aerial oxidation–hydrolysis of 1 gives the dimeric species [VOCl(Hbpb)]2·2MeNO2 3; the X-ray crystal structures of 1, 2 and 3 are reported.