Single-crystalline V(2)O(5)·xH(2)O nanorings and microloops were chemically assembled via an ion-induced chemical spinning route in the designed hydrothermal system. The morphology and structure of products were investigated by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). X-ray powder diffraction (XRD) measurement, energy-dispersive X-ray spectroscopy ...

Interest in vanadium chemistry has increased since the recognition of the involvement of vanadium ions in many important biological systems.1 The distinctive preference of the vanadium ion for N/O donor atom types has prompted the synthesis and characterization of many model complexes containing N/O donor ligands, the spectroscopic properties and solution behavior of which have been investigate...

a simple and sensitive extractive- spectrophotometric method for thedeterrnination of trace amounts of vanadium(v) is reported. the method is based on the quantitative extraction of the anion complex of v(v) with 4-(2-pyridy1azo)-resorcinol with tetrabutylammonium perchlorate into chloroform, followed by spectrophotometric measurements at 554 nm. beer's law is obeyed over the concentration...

The geometric and electronic structure of bimetallic oxide clusters is studied as a function of their composition with gas phase vibrational spectroscopy. Infrared multiple photon dissociation spectra of titanium-vanadium oxide cluster anions are measured in the 500 to 1200 wave number range and assigned on the basis of harmonic frequencies calculated using density functional theory. Singly sub...

The local structure of vanadium oxide supported on nanostructured SiO2 (VxOy/SBA-15) was investigated by in situ X-ray absorption spectroscopy (XAS). Because the number of potential parameters in XAS data analysis often exceeds the number of "independent" parameters, evaluating the reliability and significance of a particular fitting procedure is mandatory. The number of independent parameters ...

vanadium silicates such as v-al-analcime, v-analcime, v-magediite and v-zsm-11 were synthesized using vanadium pentoxide or vanadyl sulfates. vanadium silicates with analcime structure with and without aluminum (v-al-analcime, v-analcime) were prepared as pure phase by hydrothermal crystallization from a gel with molar composition of (1 sio2; 0.2 v2o5; 1 na2o; 0.034 al2o3; 35.7 h2o) and (1 sio2...

Density functional theory calculations indicate that the incorporation of V into Ti lattice positions of rutile TiO(2) leads to magnetic V(4+) species, but the extension and sign of the coupling between dopant moments confirm that ferromagnetic order cannot be reached via low-concentration doping in the non-defective oxide. Oxygen vacancies can introduce additional magnetic centres, and we show...

The reaction of the oxidovanadium(V) complexes with N,N-dimethylhydrazine was demonstrated to afford the corresponding vanadium(V) dimethylhydrazido complexes. The substituent at the 3-position of the tris(2-hydroxyphenyl)amine ligand was found to influence the electronic environment of the vanadium center. The crystal structure of the non-substituted vanadium(V) dimethylhydrazido complex exhib...

A low-cost, a high-yielding of vanadium oxide nanobelts 2 was simply synthesized by hydrothermal treatment of our (NH4)2V3O8, 1, with deionized water at 200 °C for 3 days. The SEM observations show that ribbon-like nanobelts are about 150300 nm wide and thousands of nanometers long. The XRD pattern reveals a set of the paper form reflections, characteristic of (00l) reflections for layered phas...