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Monomeric SeO 2 is a polar molecule, with the dipole moment of 2.62 D [7] pointed from the midpoint of the two oxygen atoms to the selenium atom. The solid sublimes readily. At very low concentrations the vapour has a revolting odour, resembling decayed horseradishes.
Selenium dioxide is formed by the reaction of elemental selenium with oxygen: [5] + It is a polymeric solid that forms monomeric SeO 2 molecules in the gas phase. It dissolves in water to form selenous acid, H 2 SeO 3.
As with SO 3 adducts are formed with Lewis bases such as pyridine, dioxane and ether. [ 4 ] With lithium oxide and sodium oxide it reacts to form salts of Se VI O 5 4− and Se VI O 6 6− : [ 7 ] With Li 2 O, it gives Li 4 SeO 5 , containing the trigonal pyramidal anion Se VI O 5 4− with equatorial bonds, 170.6–171.9 pm; and longer axial ...
When comparing a polar and nonpolar molecule with similar molar masses, the polar molecule in general has a higher boiling point, because the dipole–dipole interaction between polar molecules results in stronger intermolecular attractions. One common form of polar interaction is the hydrogen bond, which is also
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 Se-F bond length is 1.685 Å and the selenium to oxygen bond is 1.575 Å long. [4]
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Molecules that are formed primarily from non-polar covalent bonds are often immiscible in water or other polar solvents, but much more soluble in non-polar solvents such as hexane. A polar covalent bond is a covalent bond with a significant ionic character. This means that the two shared electrons are closer to one of the atoms than the other ...