Crystal structures of a series of bis(acetylacetonato)oxovanadium(IV) complexes containing N-donor pyridyl ligands
Abstract
Crystal structures for a series of bis(acetylacetonato)oxovanadium(IV) complexes containing N-donor pyridyl ligands are reported, namely, bis(acetylacetonato-κ O,O′)oxido(pyridine-κN)vanadium(IV), [V(C H O )2O(C5H5N)], 1, bis(acetylacetonato-κ O,O′)oxido(pyridine-4-carbonitrile-κN)vanadium(IV), [V(C H O ) O(C H N2)], 2, and bis(acetylacetonato-κ O,O′)(4-methoxypyridine-κN)oxidovanadium(IV), [V(C H O ) O(C H NO)], 3, Compounds 1-3 have the formulae VO(C H O )2 L, where L = pyridine (1), 4-cyano-pyridine (2), and 4-methoxypyridine (3). Compound 1 was previously reported [Meicheng et al. (1984). 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. 2 2 2 5 7 2 5 7 2 2 6 4 5 7 2 2 6 7 5 7 2
