Synthesis and characterization of vanadium(V) and -(IV) hydroxamate complexes. X-ray crystal structures of oxochlorobis(benzohydroxamato)vanadium(V) and oxoisopropoxo(N,N'-dihydroxy-N,N'-diisopropylheptanediamido)vanadium(V)

The Bioinorganic Chemistry of Vanadium

“…The V-OR bond in these two esters and the ester bond in 60 are conspicuously short (1 75 -186 pm; V-0 single bonds otherwise lie around 200 pm, V=O double bonds between 155 and 165 pm), which has been discussed as evidence for an ester bond in native vanadate-dependent peroxidase (Fig. 7, A) [58], 61b [loll, 62 [155]. The dashed lines in 56 and 57 imply bonding interactions with neighboring molecules.…”

A journey into the electrochemistry of vanadium compounds

“…However, electrochemical data of VO complexes were assigned to the oxidation of the naphthol ligand. Due to the interest in the highly colored complexes of hydroxamic acids with vanadium (hydroxamic acids as analytical reagents to detect this metal), the structures of the VO complex with the naturally occurring dihydroxamic acid, rhodotorulic acid (raH 2 ), was investigated and the electrochemical and spectroelectrochemical data were collected [29]. VO(ra) formed in DMSO solution, mixing vanadyl sulfate and rhodotorulic acid.…”

“…Also in this case, electrochemistry was investigated only for some compounds, selecting those with satisfactory elemental analyses. The oxido-vanadium(IV) complexes showed reversible oxidation to oxido-vanadium(V) at potentials between 0.4 and 0.6 V ( Table 2, entries 22,28,29,36,37,51) and reversible disproportionation to deoxygenated V(III) and oxido-V(V) species in the presence of acid in a reaction (Scheme 7) that is governed by equilibrium constants of ca.10 5 -10 8 M −1 .…”

“…Tridentate bisphenol ligands containing S, Se or P yielded non-oxido V(IV) complexes [115], with electrochemical results that suggest metal-centered oxidations to V(V) ( Table 3, entries [29][30][31][32]. Other tridentate ligand were sulfur based phosphanes [116].…”

Synthesis, structural characterisation and antibacterial activity of bis(1-phenyl-1,3-butanedionato)non-oxovanadium(IV) hydroxamates

“…The theoretical and experimental studies have suggested that the hydroxamic form is prevalent in free acids [15] or metal hydroxamates [16]. Fewer studies have described vanadium (IV) and (V) hydroxamate complexes as compared to many other transition metal hydroxamates [17][18][19][20][21] whereas vanadyl sulphate, ammonium vanadate and vanadyl acetylacetonate have been exploited as precursors [22]. We have been interested in exploring the use of dichlorovanadium (IV) β-diketonates as precursors for the synthesis of new complexes.…”