Abstract
A new series of oxovanadium(IV) complexes formulated as [(HL)2VO]n·nSO4 (a), [(HL)VO(SO4)]2 (b), and [L2VO] (c), where HL=phenyl-2-picolylketone and its para-substituted derivatives have been synthesized and characterized. The i.r. data suggest that the ligands are neutral bidentate in classes (a) and (b) and uninegative bidentate in (c), coordinated to the vanadyl ion via the pyridine-N and keto- or enolato-O atoms. Complexes of class (a) showed mechanochromism upon grinding. Magnetic, u.v./vis. and e.s.r. data suggest that all the complexes have a square pyramidal structure with an unpaired electron in the dxy orbital in the solid and in solutions. Deoxygenation of the oxovanadium complexes gave the corresponding dichlorovanadium(IV) derivatives. Elemental analysis, magnetic and spectral studies indicated that the dichlorovanadium(IV) complexes are associated with a distorted trans-octahedral ligand field.
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Jeragh, B.J., El-dissouky, A. Synthesis and spectroscopic studies of oxovanadium(IV) and dichlorovanadium(IV) complexes of p-X-phenyl-2-picolylketones. Transition Metal Chemistry 29, 579–585 (2004). https://doi.org/10.1007/s11243-004-5580-0
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DOI: https://doi.org/10.1007/s11243-004-5580-0