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Vanadium Compounds (1):
Recent article
Vanadium Compounds
Abstract
The current syntheses of imines from benzylamines are often performed in organic solvents or under harsh reaction conditions. Clean oxidation of primary benzylamines to imines has been successfully achieved using H(2)O(2) in water at room temperature catalyzed by V(2)O(5). Among the 10 imine product...
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PMID: 20714661
PDF is available here.
PDF is available here.
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Cancer Letters (294)1 2010
Abstract
Vanadium, a dietary micronutrient, is yet to be established as an essential part of the human diet. Over the past century, several biological effects of vanadium, such as insulin-mimetic action as well as amelioration of hyperlipidemia and hypertension, have been discovered. This transition element...
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PMID: 20206439
PDF is available here.
PDF is available here.
Journal of Hazardous Materials (178)1-3 2010
Abstract
A simple and selective method of flow injection microcolumn separation/preconcentration on-line coupled with inductively coupled plasma-optical emission spectrometry (ICP-OES) was developed for the speciation of V(V)/(IV). Various factors affecting the separation/preconcentration of V(IV) and V(V) b...
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PMID: 20133063
PDF is available here.
PDF is available here.
Journal of Hazardous Materials (178)1-3 2010
Abstract
Solid Certified Reference Materials (CRMs) with known vanadium(+5) content are currently not commercially available. Because of this, vanadium species have been determined in solid CRMs of soil, viz. CRM023-50, CRM024-50, CRM049-50, SQC001 and SQC0012. These CRMs are certified with only total vanadi...
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PMID: 20144504
PDF is available here.
PDF is available here.
Optics Express (18)11 2010
Abstract
We have integrated lithographically patterned VO2 thin films grown by pulsed laser deposition with silicon-on-insulator photonic waveguides to demonstrate a compact in-line absorption modulator for use in photonic circuits. Using single-mode waveguides at lambda=1550 nm, we show optical modulation o...
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PMID: 20588978
PDF is available here.
PDF is available here.
Abstract
Complexes between oxovanadium (IV) cation and flavonoid derivatives were developed recently in order to increase the intestinal absorption and to reduce the toxicity of vanadium compounds. For these reasons, is interesting to investigate the complexation process between flavonoid rutin (Rut) and van...
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PMID: 20336002
PDF is available here.
PDF is available here.
Abstract
We examined the influence of genetic background on susceptibility to V2O5-induced inflammation and evaluated whether V2O5 functions as a tumor promoter using a 2-stage (initiation-promotion) model of pulmonary neoplasia in mice.
A/J, BALB/cJ (BALB), and C57BL/6J (B6) mice were treate...
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PMID: 20385015
PDF is available here.
PDF is available here.
Abstract
These results demonstrate that vanadium(III), vanadium(IV), and vanadium(V) are all capable of inducing cytotoxicity, but only oxidation state IV induces clastogenic effects....
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PMID: 20001663
PDF is available here.
PDF is available here.
Abstract
Various amounts of Nb(2)O(5) in the (Na(0.5)K(0.5)) NbO(3) (NKN) ceramic were replaced by V(2)O(5) to decrease its sintering temperature to below 950 degrees C. A small V(2)O(5) content resulted in a dense microstructure with an increased grain size for the specimen sintered at 900 degrees C due to...
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PMID: 19942520
PDF is available here.
PDF is available here.
Optics Express (17)22 2009
Abstract
We have demonstrated a high-speed photo-assisted electrical gating with considerably enhanced switching characteristics in a two-terminal device fabricated by using vanadium dioxide thin film. The gating operation was performed by illuminating the output light of the EDFA, whose transient gain was m...
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PMID: 19997180
PDF is available here.
PDF is available here.
Abstract
A PCDD/F(polychlorinated dibenzo-p-dioxin and dibenzofuran)-containing gas stream generating system was developed to investigate the efficiency and effectiveness of V2O5-WO3 catalyst for PCDD/F destruction. Catalytic decomposition of PCDD/Fs (simulated gas streams) was evaluated with lab-scale pelle...
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PMID: 19848171
PDF is available here.
PDF is available here.
Biochemistry (Washington) (48)34 2009
Abstract
We present the crystal structure of Sts-2(PGM) in the phosphorylated active form and bound to VO(3), which represent structures of an intermediate and of a transition state analogue along the path of the dephosphorylation reaction. In the former structure, the proposed nucleophilic His366 is the onl...
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PMID: 19627098
PDF is available here.
PDF is available here.
Abstract
Abstract
Novel reactive nanosized V2O5/TiO2 catalysts (aerogel, xerogel, and impregnated catalysts) for the removal of Hg(O) and their synthesis methods have been introduced in this research. Aerogel catalyst has the highest surface area among the catalysts synthesized in this research and contained reactive...
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PMID: 19350929
PDF is available here.
PDF is available here.
Inorganic Chemistry (47)24 2008
Abstract
Reaction of the ligand 2,6-bis[hydroxy(methyl)amino]-4-morpholino-1,3,5-triazine (H(2)bihyat) with NaV(V)O(3) in aqueous solution followed by addition of either Ph(4)PCl or C(NH(2))(3)Cl, respectively, gave the mononuclear vanadium(V) compounds Ph(4)P[V(V)O(2)(bihyat)].1.5H(2)O (1) and C(NH(2))(3)[V...
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PMID: 19006295
PDF is available here.
PDF is available here.
Abstract
V(2)O(5) causes oxidation of DNA bases, affects DNA repair, and induces formation of MNs, NPBs, and Nbuds in blood cells, suggesting that the workers are at increased risk for cancer and other diseases that are related to DNA instability....
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PMID: 19079721
PDF is available here.
PDF is available here.
Abstract
Previous studies showed that bis(alpha-furancarboxylato)oxovanadium(IV) (BFOV), an orally active anti-diabetic organic vanadium complex, could improve insulin resistance in animals with type 2 diabetes. The present study has been carried out to evaluate the effects of BFOV on insulin-resistant gluco...
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PMID: 18812026
PDF is available here.
PDF is available here.
Abstract
The synthesis and blood glucose lowering properties of the first vanadium-vitamin B(12) bioconjugates are reported.
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PMID: 18685776
PDF is available here.
PDF is available here.
Abstract
The vibrational spectra of vanadium oxide anions ranging from V(2)O(6)(-) to V(8)O(20)(-) are studied in the region from 555 to 1670 cm(-1) by infrared multiple photon photodissociation (IRMPD) spectroscopy. The cluster structures are assigned and structural trends identified by comparison of the ex...
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PMID: 18597013
PDF is available here.
PDF is available here.
Abstract
SiO2/V2O5/TiO2 catalysts were synthesized for removing elemental mercury (Hg0) from simulated coal-combustion flue gas. Experiments were carried out in fixed-bed reactors using both pellet and powder catalysts. In contrast to the SiO2-TiO2 composites developed in previous studies, the V2O5 based cat...
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PMID: 18754385
PDF is available here.
PDF is available here.
Abstract
Calculations with the diffusion quantum Monte Carlo method are presented for vanadium oxide molecules VO0/+0(n) with n = 1-4 and for V2O5. Atomization and ionization energies are calculated as well as oxygen abstraction energies. The fixed-node approximation is compared for guide functions with orbi...
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PMID: 18535719
PDF is available here.
PDF is available here.
Abstract
Vanadia was incorporated in the 3-D mesoporous material TUD-1 with a loading of 2% w/w vanadia. The performance in the selective photo-oxidation of liquid cyclohexene was investigated using ATR-FT-IR spectroscopy. Under continuous illumination at 458 nm a significant amount of product, i.e. cyclohex...
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PMID: 18688378
PDF is available here.
PDF is available here.
Inorganic Chemistry (47)11 2008
Abstract
A general protocol for the synthesis of micro-oxo divanadium(V) compounds [LOV(micro-O)VO(Salen)] (1-5) incorporating coordination asymmetry has been developed for the first time. One of the vanadium centers in these compounds has an octahedral environment, completed by tetradentate Salen ligand, wh...
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PMID: 18452286
PDF is available here.
PDF is available here.
Abstract
Sediments from Pánuco River historically have contained elevated levels of numerous contaminants that may pose risks to ecological receptors and humans. Sediments were sampled and characterized to determine the acute sediment toxicity and its relationship with contaminants. Results demonstrated t...
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PMID: 18542835
PDF is available here.
PDF is available here.
Abstract
We previously reported the vanadyl hyperfine couplings of VO(2+)-ATP and VO(2+)-ADP complexes in the presence of the nitrogenase Fe protein from Klebsiella pneumoniae (Petersen et al. in Biochemistry 41:13253-13263, 2002). It was demonstrated that different VO(2+)-nucleotide coordination environment...
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PMID: 18351402
PDF is available here.
PDF is available here.
Abstract
We here report on the 1H-interactions with the nucleotide-bound metal center after substitution of the natural diamagnetic metal Mg2+ with paramagnetic oxo-vanadium(IV). ENDOR spectra show a number of resonances arising from interactions of the VO2+ ion with protons. In the presence of reduced Fe-pr...
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PMID: 18386081
PDF is available here.
PDF is available here.
Abstract
Abstract
We conclude that the chronic inhalation of V2O5, a frequent particle (PM(2.5)) component, induces histological changes and functional damage to the spleen, each of which appear to result in severe effects on the humoral immune response....
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PMID: 18569380
PDF is available here.
PDF is available here.
Journal of Immunology (180)6 2008
Abstract
We previously reported that STAT-1 is a protective factor and mice lacking STAT-1 are more susceptible to lung fibrosis. We also reported that V(2)O(5)-induced STAT-1 phosphorylation in lung fibroblasts requires H(2)O(2) and de novo protein synthesis. In this study, we identified IFN-beta as the pro...
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PMID: 18322232
PDF is available here.
PDF is available here.
YAKUGAKU ZASSHI (128)3 2008
Abstract
We found that intraperitoneal administrations of vanadium compounds, a stimulator of phosphatidylinositol 3-kinase (PI3K)/Akt and extracellular signal regulated kinase (ERK) pathways markedly enhances brain ischemia-induced neurogenesis. Thus, vanadium compounds are potential therapeutic agent to en...
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PMID: 18311061
PDF is available here.
PDF is available here.
Abstract
I production at low concentrations. At higher doses the complex behaved as a cytotoxic compound for the osteoblasts....
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PMID: 18097692
PDF is available here.
PDF is available here.
Abstract
In recent work, it has been shown that electrothermal atomic absorption spectrometry (ET AAS) can be used to differentiate between volatile and non-volatile nickel and vanadium compounds in crude oil. In the present work, the distribution of these two groups of compounds over different fractions of...
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PMID: 18371794
PDF is available here.
PDF is available here.
Abstract
Reactions of neutral vanadium oxide clusters with small hydrocarbons, namely C2H6, C2H4, and C2H2, are investigated by experiment and density functional theory (DFT) calculations. Single photon ionization through extreme ultraviolet (EUV, 46.9 nm, 26.5 eV) and vacuum ultraviolet (VUV, 118 nm, 10.5 e...
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PMID: 18198869
PDF is available here.
PDF is available here.
Abstract
Single crystal and powder EPR studies of VO2+ doped di-ammonium hydrogen citrate [(NH4)2C6H6O7] are carried out at room temperature. The angular variation of the EPR spectra show three different VO2+ complexes that are located in different chemical environment, and each environment contains two magn...
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PMID: 17584522
PDF is available here.
PDF is available here.
Abstract
Inspired by surface species proposed to occur on heterogeneous catalysts novel oxovanadium(v) silsesquioxanes were synthesised. Reaction of a T8-silsequioxane containing two geminal OH groups with O=V(O(i)Pr)3 led to a dinuclear compound where the geminal disiloxide functions of two silsesquioxanes...
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PMID: 18411841
PDF is available here.
PDF is available here.
Abstract
Our results demonstrate that V(2)O(5)-treated TiO(2) particles induce more potent cyto- and genotoxic effects than untreated particles. Further, acellular and cellular radical formation was more pronounced with V(2)O(5)-anatase than untreated anatase. Thus, data indicate that V(2)O(5)-treated TiO(2)...
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PMID: 18569605
PDF is available here.
PDF is available here.
Abstract
Our results have shown that Cp2VCl2 binds to transferrin and form a new complex, and the calculated apparent association constant is 1.37 x 10(5)M(-1) from the fluorescence quenching. Simultaneously, the variation of the secondary structure of transferrin occurs, most probably due to the coordinatio...
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PMID: 17825420
PDF is available here.
PDF is available here.
Abstract
Abstract
We have observed growth inhibition of rat hepatoma cell line H35-19 by inorganic vanadium salts. The aim of the present study was to determine the effect of vanadyl sulphate (VOSO4) on autocrine growth and survival of tumorogenic lung (A549) and prostate (DU145) human cell lines. Additionally, non-c...
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PMID: 18655364
PDF is available here.
PDF is available here.
Inorganic Chemistry (46)26 2007
Abstract
An unprecedented asymmetrically modified bivanadium-capped Keggin polyoxometalate (POM), {AsMo12O40(VO)[VO(H2O)]}.[Cu(4,4'-bipy)]5.H2O (1) (bipy = bipyridine), has been hydrothermally synthesized and structurally characterized by a routine technique. Single-crystal X-ray diffraction analysis reveals...
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PMID: 18004843
PDF is available here.
PDF is available here.
Inorganic Chemistry (46)25 2007
Abstract
The family of ligands containing an N2O2S2 core, namely, 1,2-di(3-Me-5-t-Bu-salicylaldimino-o-phenylthio)ethane (H2L1), 1,3-di(3-Me-5-t-Bu-salicylaldimino-o-phenylthio)propane (H2L2), 1,4-di(3-Me-5-t-Bu-salicylaldimino-o-phenylthio)butane (H2L3), and 1,2-di(3-Me-5-t-Bu-salicylaldamino-o-phenylthio)e...
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PMID: 17990873
PDF is available here.
PDF is available here.
Inorganic Chemistry (46)25 2007
Abstract
Gas-phase photoelectron spectroscopy and density functional theory have been used to investigate the electronic structures of open-shell bent vanadocene compounds with chelating dithiolate ligands, which are minimum molecular models of the active sites of pyranopterin Mo/W enzymes. The compounds Cp2...
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PMID: 18001112
PDF is available here.
PDF is available here.
Abstract
The hypothesis of the present study was that diabetes mellitus might affect brain metabolism. Streptozotocin (STZ)-induced diabetic rats, treated with vanadyl sulphate (V) and sodium tungstate (T) were employed to observe the aspartate aminotransferase (AST), alanine aminotransferase (ALT) and creat...
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PMID: 18038759
PDF is available here.
PDF is available here.
Inorganic Chemistry (46)23 2007
Abstract
A number of 4-substituted, dipicolinatodioxovanadium(V) complexes and their hydroxylamido derivatives were synthesized to characterize the solid state and solution properties of five- and seven-coordinate vanadium(V) complexes. The X-ray crystal structures of Na[VO2dipic-NH2].2H2O (2) and K[VO2dipic...
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PMID: 17941629
PDF is available here.
PDF is available here.
FASEB Journal (21)13 2007
Abstract
We show that bisperoxovanadium, a phospho-tyrosine phosphatase inhibitor, induces myogenic cells to acquire a gene expression profile and a differentiation potential consistent with the phenotype of a circulating precursors, while maintaining their myogenic potential. These effects are mediated, at...
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PMID: 17601985
PDF is available here.
PDF is available here.
Ceska a Slovenska farmacie : casopis Ceske farmaceuticke spolecnosti a Slovenske farmaceuticke spolecnosti (56)5 2007
Abstract
Plant tissue cultures represent a promising source of substances of natural origin. The main problem of their use is a low production of the majority of secondary metabolites. One of the methods of increasing the production of these substances is elicitation, because the biosynthesis of many seconda...
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PMID: 18064804
PDF is available here.
PDF is available here.
Environmental Science (28)9 2007
Abstract
V2O5-WO3/TiO2 catalysts with different vanadium and tungsten loadings were prepared by impregnation method. The activities of selective catalytic reduction (SCR) of NO with NH3 were measured and surface characteristics of those samples were characterized. It is found that both the surface areas and...
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PMID: 17990537
PDF is available here.
PDF is available here.
Journal of Contaminant Hydrology (93)1-4 2007
Abstract
Changes in the quality of groundwater resources are related to the presence and concentration of contaminants, especially trace elements such as arsenic, boron, fluoride and vanadium. Vanadium is a rare element naturally abundant, generally found in combination with other elements. Vanadium pentoxid...
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PMID: 17379355
PDF is available here.
PDF is available here.
Abstract
We describe its pharmacologic properties at rodent CXCR2 and at the CXCR1 and CXCR2 receptors in the cynomolgus monkey, as well as its in vivo activity in models demonstrating prominent pulmonary neutrophilia, goblet cell hyperplasia, and mucus production. Sch527123 bound with high affinity to the C...
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PMID: 17496165
PDF is available here.
PDF is available here.
Abstract
Abstract
The novel title polyvanadate(V), poly[[octa-mu-aqua-dodecaaqua-mu(4)-octacosaoxidodecavanadato-hexasodium] tetrahydrate], [Na(6)(H(2)O)(20)(V(10)O(28)).4H(2)O](n), contains [V(10)O(28)](6-) anions which lie about inversion centres and have approximate 2/m symmetry and which are linked to [Na(3)(H(2)...
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PMID: 17609544
PDF is available here.
PDF is available here.
Abstract
A variety of Hantzsch 1,4-dihydropyridines were oxidized to the corresponding pyridines in high yields in the presence of H(6)PMo(9)V(3)O(40), a Keggin type heteropolyacid, in refluxing acetic acid. The heteropolyacid was found to be reusable.
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PMID: 17452103
PDF is available here.
PDF is available here.
Abstract
Dimethoxymethane was synthesized from the direct oxidation of methanol with high conversion and selectivity over specially designed bifunctional V(2)O(5)/TiO2 catalysts with redox and enhanced acidic character, in which the surface acidity played an essential role for inhibiting the formation of for...
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PMID: 17520126
PDF is available here.
PDF is available here.
Reproductive Toxicology (23)4 2007
Abstract
We observed necrosis of spermatogonium, spermatocytes and Sertoli cells, as well as pseudo-nuclear inclusion and disruption of cellular junctions. Our findings stressed the importance of the hemato-testicular barrier in supporting the function of Sertoli cells and suggest as a possible target of V,...
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PMID: 17462858
PDF is available here.
PDF is available here.
Abstract
The direct reaction between [VCl(3)(thf)3] or [VO(OEt)3] and 2,2'-thiobis{4-(1,1,3,3-tetramethyl-butyl)phenol (tbopH(2)) leads to the formation of [V(2)(micro-tbop-kappa(3)O,S,O)2Cl(2)(CH(3)CN)(2)] (1).4CH(3)CN or [V(2)(micro-OEt)2(O)2(tbop-kappa(3)O,S,O)2] (2), respectively, in high yield. Compound...
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PMID: 17502940
PDF is available here.
PDF is available here.
Abstract
We have investigated the electron density distribution of the valence states, the total density of states (total DOS) and the partial valence band density of states (PVBDOS). Experimentally, amorphous V(2)O(5) thin films have been prepared by physical vapour deposition (PVD) on freshly cleaved highl...
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PMID: 17508089
PDF is available here.
PDF is available here.
Structural and redox properties of VOx and Pd/VOx thin film model catalysts studied by TEM and SAED.
Abstract
The oxidation of pure V(2)O(3) and Pd/V(2)O(3) films was studied by Transmission Electron Microscopy (TEM) and Selected Area Electron Diffraction (SAED) in the temperature range 673-773 K. Thin films of V(2)O(3) were prepared by reactive deposition of V metal in 10(-2) Pa O(2) on NaCl(001) cleavage...
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PMID: 17492107
PDF is available here.
PDF is available here.
Inorganic Chemistry (46)10 2007
Abstract
The complex formation of vanadium(IV) with cis-inositol (ino) and the corresponding trimethyl ether 1,3,5-trideoxy-1,3,5-trimethoxy-cis-inositol (tmci) was studied in aqueous solution and in the solid-state. With increasing pH, the formation of [VO(H-2L)], [(VO)2L2H-5]-, [VO(H-3L)]- (L = ino) or [(V...
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PMID: 17419616
PDF is available here.
PDF is available here.
Inorganic Chemistry (46)10 2007
Abstract
A study of the aqueous H3O+(OH-)/H2VO4-/(2R,3R)-tartrate system has been performed at 273 K in a 1.0 mol/L Na+(Cl-) ionic medium using 51V NMR spectroscopy. In this relatively complicated system, more than 12 different species were observed. Ligand concentration, vanadate concentration, and pH varia...
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PMID: 17419617
PDF is available here.
PDF is available here.
Abstract
In the present study an attempt has been made to evaluate the effect of Tiron along with Zinc, Selenium and Vitamin E against vanadium intoxication in female albino rats. Toxicant caused significant increase in the activities of serum transaminases, serum alkaline phosphatase and lactate dehydrogena...
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PMID: 17538242
PDF is available here.
PDF is available here.