报道了一系列含有N-供体吡啶基配体的双-(乙酰丙酮)氧代钒(IV)配合物的晶体结构,即,双-(乙酰丙酮-κ2O,O\')氧化(吡啶-κN)钒(IV),[V(C5H7O2)2O(C5H5N)],1,双-(乙酰丙酮-κ2O,O\')氧化(吡啶-4-碳腈-κN)钒(IV),[V(C5H7O2)2O(C6H4N2)],2,和双-(乙酰丙酮-κ2O,O\')(4-甲氧基-吡啶-κN)氧化钒(IV),[V(C5H7O2)2O(C6H7NO)],3,化合物1-3具有式VO(C5H7O2)2L,其中L=吡啶(1),4-氰基-吡啶(2),和4-甲氧基-吡啶(3)。以前报道过化合物1[Mecheng等人。(1984年间)。可学通宝,29,759-764和达席尔瓦,Spiazzi,Bortolotto&Burrow(2007)。水晶学报。,E63,m2422],此处在低温温度下重新确定。化合物1和2为吡啶和4-氰基-吡啶加合物,分别,结晶为扭曲的八面体结构,其中氧代和吡啶基配体彼此反式。晶体学的双重轴穿过O-V-N键。含有4-甲氧基-吡啶配体的化合物3结晶为扭曲的八面体结构,其中氧代和吡啶基配体彼此顺式,去除在其他复合物中看到的双重对称。
Crystal structures for a series of bis-(acetyl-acetonato)oxovanadium(IV) complexes containing N-donor pyridyl ligands are reported, namely, bis-(acetyl-acetonato-κ2 O,O\')oxido(pyridine-κN)vanadium(IV), [V(C5H7O2)2O(C5H5N)], 1, bis-(acetyl-acetonato-κ2 O,O\')oxido(pyridine-4-carbo-nitrile-κN)vanadium(IV), [V(C5H7O2)2O(C6H4N2)], 2, and bis-(acetyl-acetonato-κ2 O,O\')(4-meth-oxy-pyridine-κN)oxidovanadium(IV), [V(C5H7O2)2O(C6H7NO)], 3, Compounds 1-3 have the formulae VO(C5H7O2)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 & Burrow (2007). Acta Crystallogr., E63, 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.