Several oxovanadium (IV) complexes of pyradoxamine (PM), pyridoxol (P), pyridoxal (PL), and glycinehydroxamate (GX) were obtained as a result of potentiometric data analysis using SUPERQUAD at I = 0.15 M NaCl and T = 25°C. Protonated, unprotonated and hydroxospecies were detected in solutions. No polymeric species of oxovanadium(IV) were found under the experimental conditions used. Differentia...

Reactions of the salicylaldehyde 4-phenylthiosemicarbazone (H(2)L) with selected vanadium(iv) and vanadium(v) precursors ([VO(acac)(2)], [VO(OAc)(2)], VOSO(4), [V(2)O(4)(acac)(2)]) were investigated under aerobic conditions in different alcohols (methanol, ethanol, propanol). In all examined cases mononuclear alkoxo vanadium(v) complexes [VOL(OR)] (1) (OR = OMe, OEt, OPr) were isolated as major...

In the structure of the title compound, [V(C(5)H(7)O(2))(2)O(C(18)H(15)OP)], the V atom adopts a slightly distorted octa-hedral geometry with its coordination completed by four O atoms of two acetyl-acetonate (acac) ligands, one oxo group and one O atom of the triphenyl-phosphine oxide (OPPh(3)) ligand.

Original and effective syntheses of crystalline silver wires and saw bundles, using reduced Keggin polyoxomolybdovanadate (POM) as mediator and reducing agent, were performed in acetonitrile at room temperature; several parameters influencing the final silver 1D-structures, with micrometric length and nanometric thickness, were varied: the nature of the POM, silver salts, vanadium(iv) source an...

•Harnessed V4+ metal centers as polarizing agents for dynamic nuclear polarization•Determined spin-diffusion barrier size using V4+-to-1H polarization transfer•Traced pathways V4+-1H spin “rulers”•Direct of 1H nuclei located 12.6 Å from the center Dynamic (DNP) offers a strategy to amplify inherently insensitive magnetic resonance (NMR) signal by orders magnitude, dramatically enhancing NMR stu...

A selective, sensitive, less expensive and more precise method was developed for the separation of vanadium [VO] using Nn-octylaniline (liquid anion exchanger) coated silica gel as stationary phase. The quantitative extraction of vanadium was found with 0.065 mol/L N-n-octylaniline and 0.009 to 0.02 mol/L of sodium malonate at pH 10.5. The extracted vanadium ion was eluted from the column with ...

This study presents the investigation and comparison the influence of VOSO4 [V(IV)I, Na3VO4 and NaVO3 [V(V)] in the range of 0.5-20.0 microM on the rat hepatoma cell line H35-19. The cells were tested with crystal violet (N-hexamethylpararosaniline), and counted in a Bürker chamber to determine their rate of proliferation, while the survival level was established with neutral red and MTT [bromi...