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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.
The product, (CH 3 CH 2) 3 Al 2 Cl 3, is called ethylaluminium sesquichloride. The term sesquichloride refers to the fact that, on average, the Cl:Al ratio is 1.5. These sesquichlorides can be converted to the triorganoaluminium derivatives by reduction: 2 (CH 3 CH 2) 3 Al 2 Cl 3 + 6 Na → (CH 3 CH 2) 6 Al 2 + 2 Al + 6 NaCl
A stable derivative of aluminium monoiodide is the cyclic adduct formed with triethylamine, Al 4 I 4 (NEt 3) 4. Also of theoretical interest but only of fleeting existence are Al 2 O and Al 2 S. Al 2 O is made by heating the normal oxide, Al 2 O 3, with silicon at 1,800 °C (3,272 °F) in a vacuum. Such materials quickly disproportionate to the ...
Aluminium borohydride, also known as aluminium tetrahydroborate, is the chemical compound with the formula Al(BH 4) 3. It is a volatile pyrophoric liquid which is used as a reducing agent in laboratories. Unlike most other metal–borohydrides, which are ionic structures, aluminium borohydride is a covalent compound. [2] [3]
Most compounds considered to be Lewis acids require an activation step prior to formation of the adduct with the Lewis base. Complex compounds such as Et 3 Al 2 Cl 3 and AlCl 3 are treated as trigonal planar Lewis acids but exist as aggregates and polymers that must be degraded by the Lewis base. [10] A simpler case is the formation of adducts ...
4 found in the compound Na 5 AlO 4, [2] framework AlO − 2 ions in anhydrous sodium aluminate NaAlO 2 [3] and monocalcium aluminate, CaAl 2 O 4 made up of corner-sharing {AlO 4} tetrahedra. [4] A ring anion, the cyclic Al 6 O 18− 18 anion, found in tricalcium aluminate, Ca 3 Al 2 O 6, which can be considered to consist of 6 corner sharing ...
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With simple Lewis bases (L), Al 2 Br 6 forms adducts, such as AlBr 3 L. Aluminium tribromide reacts with carbon tetrachloride at 100 °C to form carbon tetrabromide: 4 AlBr 3 + 3 CCl 4 → 4 AlCl 3 + 3 CBr 4. and with phosgene yields carbonyl bromide and aluminium chlorobromide: [citation needed] AlBr 3 + COCl 2 → COBr 2 + AlCl 2 Br. Al 2 Br ...