Crystal structures of a series of bis­­(acetyl­aceto­nato)oxovanadium(IV) complexes containing N-donor pyridyl ligands

Crystal structures for a series of bis­(acetyl­acetonato)oxovanadium(IV) complexes containing N-donor pyridyl ligands are reported, namely, bis­(acetyl­acetonato-κ2O,O′)oxido(pyridine-κN)vanadium(IV), [V(C5H7O2)2O(C5H5N)], 1, bis­(acetyl­acetonato-κ2O,O′)oxido(pyridine-4-carbo­nitrile-κN)vanadium(IV), [V(C5H7O2)2O(C6H4N2)], 2, and bis­(acetyl­acetonato-κ2O,O′)(4-meth­oxy­pyridine-κN)oxidovanadium(IV), [V(C5H7O2)2O(C6H7NO)], 3, Compounds 1–3 have the formulae VO(C5H7O2)2L, where L = pyridine (1), 4-cyano-pyridine (2), and 4-meth­oxy­pyridine (3). Compound 1 was previously reported [Meicheng et al. (1984[Meicheng, S., Lifeng, W. & Youqi, T. (1984). Kexue Tongbao (Chin. Sci. Bull.) 29, 759-764.]). Kexue Tongbao, 29, 759–764 and DaSilva, Spiazzi, Bortolotto & Burrow (2007). Acta Crystallogr., E63, m2422] and redetermined here at cryogenic temperatures. Compounds 1 and 2 as pyridine and 4-cyano­pyridine adducts, respectively, crystallize as distorted octa­hedral structures with the oxo and pyridyl ligands trans to one another. A crystallographic twofold axis runs through the O—V—N bonds. Compound 3 containing a 4-meth­oxy­pyridine ligand crystallizes as a distorted octa­hedral structure with the oxo and pyridyl ligands cis to one other, removing the twofold symmetry seen in the other complexes.