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Dalton Trans. 2008 Dec 21;(47):6832-42. doi: 10.1039/b811792f. Epub 2008 Oct 23.

Organo-aluminium and -gallium complexes with omega-NH-functional alkoxide ligands.

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Fakultät für Chemie, Anorganische Chemie und Strukturchemie, Universität Bielefeld, Universitätstrasse 25, 33615 Bielefeld, Germany.


The aminoalcohols MeNH(CH(2))(2)OH (), (t)BuNH(CH(2))(2)OH (), MeNH(CH(2))(3)OH (), (t)BuNH(CH(2))(3)OH () and MeNHCH(2)CMe(2)CH(2)OAlMe(2) () have been reacted with AlMe(3) to give the five corresponding aminoalkoxides of the general formula RNH-X-AlMe(2)- (X = organic spacer between N and O). (t)BuNHCH(2)CMe(2)CH(2)OH () reacts with AlMe(3) to give [(t)BuNHCH(2)CMe(2)CH(2)OAlMe(2)].AlMe(3) (.AlMe(3)). Analogous reactions of the aminoalcohols , , and with Al(t)Bu(3), GaMe(3) and Ga(t)Bu(3) afforded the corresponding aminoalkoxides of the general formula RNH-X-MR'(2)- (MR'(2) = Al(t)Bu(2)), - (MR'(2) = GaMe(2)) and - (MR'(2) = Ga(t)Bu(2)). The compounds were characterised by NMR spectroscopy, elemental analyses and mass spectrometry. Crystal structures were determined for , , .AlMe(3), , , and . Compounds and dimerise via Al(2)O(2) rings, while the amino-functions form intramolecular Al-N bonds. Compounds and form monomers with intramolecular Ga-N bonds. Compounds and are dimers via Ga(2)O(2) rings but in contrast to and without formation of intramolecular Ga-N bonds. .AlMe(3) also forms a monomeric compound with intramolecular AlN bond and a further AlMe(3) unit bonded to the O atom. The dynamic behaviour of and was investigated by variable-temperature NMR spectroscopy. Some compounds have different aggregation in solid and fluid phases.


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