22541-77-1Relevant articles and documents
Reactions of vanadium(IV) and (V) with s2 metal-ion reducing centers
Yang, Zhiyong,Gould, Edwin S.
, p. 3963 - 3967 (2003)
The s2 centers, Sn(II), Ge(II), and In(I) reduce VO2+ rapidly and quantitatively to VO2+, and In(I) converts VO2+ (much more slowly) to V3+. Sn(II) and Ge(II) react measurably with VO2+ only in chloride media in the presence of added Cu(II). Arguments are presented that the V(v) reductions are initiated by a two-unit reduction to V(III) (via a hydroxo bridge), followed by a rapid comproportionation (VIII + VV → 2 VIV). The Cu(II)-catalyzed V(IV)-Sn(II) and V(IV)-Ge(II) reactions at high [Cl-] involve preliminary conversion of the catalyst to Cu(I), which then reduces V(IV), and kinetic profiles of the Ge(II) system point to participation of chloride-bound Ge(III) as well.
Molybdenum and copper catalysis of reductions by titanium(II) and titanium(III)
Yang, Zhiyong,Gould, Edwin S.
, p. 396 - 398 (2007/10/03)
Reductions of vanadium(iv), benzoquinone, and tri-iodide, both by titanium(iii) and by titanium(ii), are catalyzed by molybdenum(vi). The VO 2+-Ti(ii) reaction is catalyzed by copper(ii) as well. Reactions of Ti(ii) with the oxidant in excess y
2′-Hydroxyacetophenonebenzoylhydrazone as an analytical reagent for the spectrophotometric determination of vanadium(III)
Agnihotri,Dass,Mehta
, p. 165 - 167 (2007/10/03)
2′-Hydroxyacetophenonebenzoylhydrazone (HABH) forms a light red 1:2 (V : HABH) complex with VIII species at 50-60° in 0.12-0.20 M CH3COOH medium which is extracted into benzene and has λmax at 465 nm. The molar absorptivity, Sandell's sensitivity and standard deviation arc 1.05 × 104 dm3 mol-1 cm-1, 0.0049 μg V cm-2 and ±0.0006 respectively, at 465 nm. Beer's law is obeyed over the concentration range 0-1.5 μg V ml-1. Large number of elements do not interfere. The method can be used to determine vanadium in a wide variety of synthetic and technical samples including alloyed steel and reverberatory flue dust.
