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Methaneseleninic acid shows potential anticancer activity and is a model for studying the anticancer effects of selenium in vitro. [7] Methaneseleninic acid shows superior in vivo inhibitory efficacy toward human prostate cancer compared to selenomethionine or selenite (ion). [8]
Lewis structure of a water molecule. Lewis structures – also called Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDs) – are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.
Structure. The shape of the molecule is a distorted tetrahedron with the O-Se-O angle being 126.2°, the O-Se-F angle being 108.0° and F-Se-F being 94.1°. [3]
The monomeric form adopts a bent structure very similar to that of sulfur dioxide with a bond length of 161 pm. [6] The dimeric form has been isolated in a low temperature argon matrix and vibrational spectra indicate that it has a centrosymmetric chair form. [5] Dissolution of SeO 2 in selenium oxydichloride give the trimer [Se(O)O] 3. [6]
Selenous acid is analogous to sulfurous acid, but it is more readily isolated.Selenous acid is easily formed upon the addition of selenium dioxide to water. As a crystalline solid, the compound can be seen as pyramidal molecules that are interconnected with hydrogen bonds.
(a) Crystal structure of Cu 2 OSeO 3 consisting of (b) Cu1 bipyramids and (c) Cu2 distorted square-based pyramids. Bonds to Se ions are omitted for clarity. (d) The ferrimagnetic structure of Cu 2 OSeO 3 with spins (green arrows) on Cu1 site antiparallel to the spins (red arrows) on Cu2 sites.
OsO 4 is a Lewis acid and a mild oxidant. It reacts with alkaline aqueous solution to give the perosmate anion OsO 4 (OH) 2− 2. [17] This species is easily reduced to osmate anion, OsO 2 (OH) 2− 4. When the Lewis base is an amine, adducts are also formed.
Structure of selenite Space-filling model of selenite Mn, Fe(III), Ni, Co, Cu selenites. Selenite refers to the anion with the chemical formula Se O 2− 3. It is the oxyanion of selenium. It is the selenium analog of the sulfite ion, SO 2− 3. Thus selenite is pyramidal and selenium is assigned oxidation state +4.