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Crystal structures for a series of bis-(acetyl-acetonato)oxovanadium(IV) complexes containing N -donor pyridyl ligands are reported, namely, bis-(acetyl-acetonato-κ 2  O , O ')oxido(pyridine-κ N )vanadium(IV), [V(C 5 H 7 O 2 ) 2 O(C 5 H 5 N)], 1 , bis-(acetyl-acetonato-κ 2  O , O ')oxido(pyridine-4-carbo-nitrile-κ N )vanadium(IV), [V(C 5 H 7 O 2 ) 2 O(C 6 H 4 N 2 )], 2 , and bis-(acetyl-acetonato-κ 2  O , O ')(4-meth-oxy-pyridine-κ N )oxidovanadium(IV), [V(C 5 H 7 O 2 ) 2 O(C 6 H 7 NO)], 3 , Compounds 1 - 3 have the formulae VO(C 5 H 7 O 2 ) 2  L , where L = pyridine ( 1 ), 4-cyano-pyridine ( 2 ), and 4-meth-oxy-pyridine ( 3 ). Compound 1 was previously reported [Meicheng et al. (1984 ▸). Kexue Tongbao , 29 , 759-764 and DaSilva, Spiazzi, Bortolotto &amp; Burrow (2007). Acta Crystallogr. , E 63 , m2422] and redetermined here at cryogenic temperatures. Compounds 1 and 2 as pyridine and 4-cyano-pyridine adducts, respectively, crystallize as distorted octa-hedral 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-meth-oxy-pyridine ligand crystallizes as a distorted octa-hedral structure with the oxo and pyridyl ligands cis to one other, removing the twofold symmetry seen in the other complexes.

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