Vanadium complexes isoquinoline

Early publications on [VO(/3-diketonato)2] have been reviewed.355 More recently, complexes with benzoyl m-nitroacetanilide, benzoyl acetanilide545 and l,l -(l,3-phenylene)-bis(butane-1,3-dione546 have been synthesized. Other [VO(/S-dik)2] adducts have been isolated, for example [VO(acac)2] adducts with a series of pyridine N-oxides547 and several pyridine carboxamides, 48 and [VO(bzac)2] adducts with pyridine, methylamine, isoquinoline and 4-picoline.549 Equilibrium constants of 1 1 and 2 1 adducts of pyrazine with [VO(tfacac)2] have been determined (equation 38).550 In the 2 1 complex, the pyrazine bridge between two equatorial sites of adjacent vanadium atoms promotes a weak exchange interaction. The nitroxide radical 2,2,6,6-tetramethylpiperidinyl N-oxide also forms an adduct with [VO(hfacac)2] in which there is a strong interaction between the electrons on the metal and nitroxide.551... 

Vanadium(II) heterocyclic amine complexes of the type [VX2L4] and [VL6]X2 (L = heterocyclic amine, e g. pyrazole, imidazole, 2-methylimidazole, benzimidazole, isoquinoline X = anionic ligand) have been known for some time and more recent examples of such complexes include polypyridyl V complexes of the type [V(terpy)(bipy)L] +. Such complexes are obtained as a result of the disproportionation reaction of [V (terpy)Cl3], which yields [V (terpy)2] + and [V 0] + in CH2CI2 suspensions. ... 

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