The information obtained from the characterization of vanadium oxide single crystal surfaces is related to the study of vanadia nanoparticles supported on silica and alumina thin films, model systems for the so-called ‘‘supported monolayer vanadia catalysts’’. It is found that these particles have properties similar to V2O3 surfaces, where the topmost V ions are involved in vanadyl groups and h...

The preparation of vanadyl pyrophosphate (VPO) strongly influences their catalytic activity in partial oxidation of butane to maleic anhydride. The characteristics of VOHPO4•0.5H2O, (called “the precursor” in this paper) are strongly influenced by the reagents, the ratio of phosphorous to vanadium, the nature of the solvent and the conditions of the reduction step during the preparation. Synhes...

Acult mallard ducks fed 0, 1, 10, or 100 ppm vanadyl sulfate in the diet were sacrificed after 12 wk on treatment; tissues were analyzed for vanadium. No birds died during the study and body weights did not change. Vanadium accumulated to higher concentrations in the bone and liver than in other tissues. Concentrations in bones of hens were five times those in bones of drakes, suggesting an int...

Mice fed a diet low in many trace elements and raised in an environment where contamination from extraneous trace ele ments was controlled were given small amounts (5 jig/ml) of arsenite, germanate, stannous, or vanadyl ions in drinking water for their life times. Animals receiving arsenite had a significantly decreased incidence of all tumors, and of tumors of the lung, compared to those recei...

V2O5/SiO2 nanoparticles was prepared via an one-pot sol gel method from vanadyl- acetylacetonate and tetraethylorthosilicate in refluxing MeOH, followed by calcination at 700 °C for 2 hours. The resultant nanoparticles was characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), TGA and FTIR techniques. Rapid and efficient ar...

The V(V) atom in the title compound, [V(C(8)H(9)N(2)O)(C(17)H(14)N(2)O(3))O]·CH(3)OH, is N,O-chelated by the benzoyl-hydrazidate anion and O,N,O'-chelated by the (benzoyl-hydrazono)propionate dianion. The octa-hedral trans-N(2)O(4) coordination geometry is completed by the vanadyl O atom. Two mononuclear complexes and two solvent mol-ecules are linked by O-H⋯O and O-H⋯N hydrogen bonds, generati...

Stepwise formation constants corresponding to 1:1 vanadyl complexes with methionine, phenyl­ alanine and threonine have been determined at 25 °C, and at various ionic concentrations, viz. 0.01, 0.1 and 0.3 M, maintained by the addition of potassium chloride solution. Thermodynamic stability constants have been obtained by extrapolation of log K values to zero ionic strength. Logarithms of the o...

Mice fed a diet low in many trace elements and raised in an environment where contamination from extraneous trace ele ments was controlled were given small amounts (5 jig/ml) of arsenite, germanate, stannous, or vanadyl ions in drinking water for their life times. Animals receiving arsenite had a significantly decreased incidence of all tumors, and of tumors of the lung, compared to those recei...