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Aluminylene
Aluminylenes are a sub-class of aluminium(I) compounds that feature singly-coordinated aluminium atoms with a lone pair of electrons. As aluminylenes exhibit two unoccupied orbitals, they are not strictly aluminium analogues of carbenes until stabilized by a Lewis acids and bases, Lewis base to form aluminium(I) nucleophiles. The lone pair and two empty orbitals on the aluminium allow for ambiphilic bonding where the aluminylene can act as both an electrophile and a nucleophile. Aluminylenes have also been reported under the names alumylenes and alanediyl. The +1 oxidation state for aluminium is less stable than heavier Boron group, group 13 elements, but the lower stability and higher reactivity of aluminium(I) compounds make for interesting chemistry. The first aluminium(I) compound to be isolated was Dohmeier's (Pentamethylcyclopentadienyl)aluminium(I), (AlCp*)4 which existed as a tetrameric solid but dissociated in solution to the monomer. This was followed by Roesky's s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aluminium(I) Compounds
In chemistry, aluminium(I) refers to Monovalent ion, monovalent aluminium (+1 oxidation state) in both Ionic bonding, ionic and Covalent bond, covalent bonds. Along with aluminium(II), it is an extremely unstable form of aluminium. While late Group 13 elements such as thallium and indium prefer the +1 oxidation state, aluminium(I) is rare. Aluminium does not experience the inert-pair effect, a phenomenon where valence s electrons are poorly shielded from nuclear charge due to the presence of filled d and f orbitals. As such, aluminium (III) (Al^3+) is the much more common oxidation state for aluminium. Aluminium(I) compounds are both prone to disproportionation and difficult to prepare. At standard conditions, they readily oxidize to the aluminium(III) form. Characteristics Al(I) appears to be red, as solutions of Aluminium monobromide, AlBr and Aluminium monochloride, AlCl in organic solvents are both red. The presence of this color implies a relatively small HOMO/LUMO gap that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
