Abstract
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.
Highlights
Oxovanadium(IV) complexes have been cited as having numerous practical pharmacological applications ranging from anticancer agents to anti-fungal agents and, more recently, as an insulin mimetic (Singh et al, 2014; Abakumova et al, 2012; Amin et al, 2000)
Oxovanadium complexes chelated by two acetylacetonate ligands form a five-coordinate bonding system that can act as a Lewis acid (Nenashev et al 2015; Ugone et al, 2019; Costa Pessoa, 2015; Correia et al 2017)
We describe the structures of VO(C5H7O2)2L, where L = pyridine (1), 4-cyano-pyridine (2), and 4-methoxypyridine (3), and the isolation of different isomeric forms
Summary
Oxovanadium(IV) complexes have been cited as having numerous practical pharmacological applications ranging from anticancer agents to anti-fungal agents and, more recently, as an insulin mimetic (Singh et al, 2014; Abakumova et al, 2012; Amin et al, 2000). Oxovanadium complexes chelated by two acetylacetonate ligands form a five-coordinate bonding system that can act as a Lewis acid (Nenashev et al 2015; Ugone et al, 2019; Costa Pessoa, 2015; Correia et al 2017). This system can undergo a reaction with a Lewis base to increase its coordination. Of the extensive studies regarding the properties and applications of such complexes, relatively few single-crystal structures have been reported. The complexes were synthesized rapidly in an Anton Paar Monowave 50 synthesis reactor in 5 minutes at 323 K and crystallized upon cooling the mother liquor
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