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[1] [2] [3] Introduced by Gilbert N. Lewis in his 1916 article The Atom and the Molecule, a Lewis structure can be drawn for any covalently bonded molecule, as well as coordination compounds. [ 4 ] Lewis structures extend the concept of the electron dot diagram by adding lines between atoms to represent shared pairs in a chemical bond.
3 is dimeric, consisting of Al 2 I 6, similar to that of AlBr 3. [3] The structure of monomeric and dimeric forms have been characterized in the gas phase. [6] The monomer, AlI 3, is trigonal planar with a bond length of 2.448(6) Å, and the bridged dimer, Al 2 I 6, at 430 K is a similar to Al 2 Cl 6 and Al 2 Br
The pure compound is white, but typical samples are coloured. [3] Samples are usually protected from moisture, because they hydrolyze readily, giving off highly toxic hydrogen selenide gas: [ 4 ] Al 2 Se 3 + 3 H 2 O → Al 2 O 3 + 3 H 2 Se
The only stable chalcogenides under normal conditions are aluminium sulfide (Al 2 S 3), selenide (Al 2 Se 3), and telluride (Al 2 Te 3). All three are prepared by direct reaction of their elements at about 1,000 °C (1,832 °F) and quickly hydrolyse completely in water to yield aluminium hydroxide and the respective hydrogen chalcogenide .
A demonstration of the reaction of the exothermic reaction of the strong Lewis acid (Al 2 Br 6) and strong Lewis base (H 2 O). Al 2 Br 6 dissociates readily to give the strong Lewis acid , AlBr 3 . Regarding the tendency of Al 2 Br 6 to dimerize , it is common for heavier main group halides to exist as aggregates larger than implied by their ...
Aluminium nitrate is a strong oxidizing agent. It is used in tanning leather, antiperspirants, corrosion inhibitors, extraction of uranium, petroleum refining, and as a nitrating agent.
[3] [7] Lewis was best known for his discovery of the covalent bond and his concept of electron pairs; his Lewis dot structures and other contributions to valence bond theory have shaped modern theories of chemical bonding.
HSAB is an acronym for "hard and soft (Lewis) acids and bases".HSAB is widely used in chemistry for explaining the stability of compounds, reaction mechanisms and pathways. It assigns the terms 'hard' or 'soft', and 'acid' or 'base' to chemical species.