نتایج جستجو برای: molybdenum vi complexes

تعداد نتایج: 191792  

Journal: :Applied and environmental microbiology 1997
R Ganesh K G Robinson G D Reed G S Sayler

The influence of organic-hexavalent-uranium [U(VI)] complexation on U(VI) reduction by a sulfate-reducing bacterium (Desulfovibrio desulfuricans) and an iron-reducing bacterium (Shewanella alga) was evaluated. Four aliphatic ligands (acetate, malonate, oxalate, and citrate) and an aromatic ligand (tiron [4,5-dihydroxy-1,3-benzene disulfonic acid]) were used to study complexed-uranium bioavailab...

Abbas Afkhami, Atousa Bahiraei Mahdi Moradi Tayyebeh Madrakian,

In this work a new chemically modified carbon paste electrode was constructed for accurate, simple, sensitive and selective determination of molybdenum (VI) ions. The results of modified electrode by an ion imprinted polymer were compared with those obtained with carbon paste electrode. The results showed the stripping peak currents had a dramatic increase at the modified electrode. Under the o...

2008
RAMA KRISHNA

A new tetradentate Schiff base, 3-[(Z)-2-piperazin-1-yl-ethylimino]-1, 3-dihydro indol-2-one was synthesized by the condensation of isatin(Indole-2,3dione) with 1-(2-aminoethyl)piperazine(AEP). Its complexes with Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Hg(II), UO2(VI) and Th(IV) have been synthesized and characterized by microanalysis, conductivity, UV-visible, FT-IR, 1H NMR, TGA and magnetic s...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2012
Tomoki Yabutani Hidehiko Sumi Takamasa Nakamura Shinsuke Akatsuki Le Thi Xuan Thuy

In the present work, we investigated the multielemental elution behavior of metal ions absorbed on iminodiacetic acid (IDA) chelating resin by using hydrogen peroxide (H(2)O(2)) as an eluent. As a result, V(V), Mo(VI), W(VI), Nb(V) and Ta(V) were efficiently eluted by H(2)O(2). In contrast, other metal ions were rarely recovered. The oxidation states of V(V), Mo(VI), and W(VI) were not changed ...

2016
Sara R. M. M. de Aguiar Berthold Stöger Ernst Pittenauer Günter Allmaier Luis F. Veiros Karl Kirchner

This work presents a comparative study of a series of halocarbonyl Mo(II) and W(II) complexes of the types [M(PNP)(CO)3X]X and [M(PNP)(CO)2X2] (M = Mo, W; X = I, Br), featuring PNP pincer ligands based on a 2,6-diaminopyridine scaffold. The complexes were prepared and fully characterized. The syntheses of these complexes were accomplished by treatment of [M(PNP)(CO)3] with stoichiometric amount...

Journal: :The Biochemical journal 1994
F Falciani M Terao S Goldwurm A Ronchi A Gatti C Minoia M Li Calzi M Salmona G Cazzaniga E Garattini

The mouse L929 fibroblastic cell line presents low, but detectable, levels of the mRNA encoding xanthine oxidoreductase under basal conditions, and it responds to type I and type II interferons by inducing the expression of the transcript [Falciani, Ghezzi, Terao, Cazzaniga, and Garattini (1992) Biochem. J. 285, 1001-1008]. This cell line, however, does not show any detectable amount of xanthin...

1997
Sabine Goldberg C. L. Godfrey

Molybdenum adsorption behavior was investigated on various crystalline and x-ray amorphous Al and Fe oxide minerals, clay minerals, CaC@, and arid-zone calcareous and noncalcareous s soils. Molybdenum adsorption on botb Al and Fe oxides exhibited a maximum at low pH extending to about pH 4 to 5. Above pH 5 adsorption decreased rapidly, with little adsorption occurring above pH 8. Molybdenum ads...

Journal: :Inorganic chemistry 2009
Atsushi Ikeda-Ohno Christoph Hennig Satoru Tsushima Andreas C Scheinost Gert Bernhard Tsuyoshi Yaita

In order to elucidate the uranium solution chemistry at the high HNO(3) concentrations typically employed for the reprocessing of spent nuclear fuels, speciation and complex structures of U(IV) and U(VI) are studied in aqueous HNO(3) solutions, as well as in HClO(4) solutions, by means of UV-visible-near-infrared and X-ray absorption spectroscopies and density functional theory calculations. In...

2016
Sara R. M. M. de Aguiar Berthold Stöger Ernst Pittenauer Günter Allmaier Luis F. Veiros Karl Kirchner

This work presents a comparative study of a series of halocarbonyl Mo(ii) and W(ii) complexes of the types [M(PNP)(CO)3X]X and [M(PNP)(CO)2X2] (M = Mo, W; X = I, Br), featuring PNP pincer ligands based on a 2,6-diaminopyridine scaffold. The complexes were prepared and fully characterized. The syntheses of these complexes were accomplished by treatment of [M(PNP)(CO)3] with stoichiometric amount...

2013
ANUBHA SAXENA

The ligand derived from 1-phenyl-2, 3-dimethyl-4-(4-iminopentan-2-one)-pyrazolin-5-one and 2-aminophenol behaved in neutral tetra dentate manner. Its complexes with Ti (III), V (III), Mn (III), Ru (III), MoO (V), MoO2 (VI), and UO2 (VI) were prepared and characterized by elemental analysis, conductivity, magnetic studies and spectral data. Based on these studies octahedral geometry has been pro...

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