Coordination Geometry of Peroxo and Hydroxamido Vanadates

Crystal structures for both oxobispero [16] and oxobishydroxamido (bis(/V,/V-dieth-ylhydroxamido) [17]) and (bis(/V,/V-dimcthyIhydroxamido) [6]) vanadates have been reported. In both the peroxo and hydroxamido cases, the complexes occur as dimers 

Selected VO and VN Bond Lengths (A) for Various Vanadium Peroxo and Hydroxamido Complexes 

FIGURE 5.3 Diagrammatic representation of the structure of the oxotrisperovanadium(V) dianion. Detailed information for structure provided by F.W.B. Einstein [20]. 

FIGURE 5.4 Vanadium NMR spectrum showing the formation of various hydroxamidova-nadium(V) complexes. Experimental conditions 3.0 mM total vanadate, 5.0 mM total hydrox-ylamine, 20 mM HEPES buffer, 1.0 M KC1, pH 6.9. 

This is a ubiquitous, though not highly favored, type of complex, and a similar complex quite likely is formed with the hydrogen peroxide ligand. 

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