Monomeric, N-functionalised amido complexes of aluminium: Synthesis of [AlCl{NR(8-C9H6N)}2] (R = H or SiMe3) and [Al{N(2-C5H4N)-(2-C5H4N)} 3]

Lutz M. Engelhardt, Michael G. Gardiner, Cameron Jones, Peter C. Junk, Colin L. Raston, Allan H. White

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Routes have been devised to a series of aluminium(III) amide complexes containing either of the bulky, N-functionalised amides NR(8-C9H6N)- (R = H or SiMe3) or N(2-C5H4N)2-. Reaction of the lithium amides [{Li(OEt2)[NR(8-C9H6N)]}2] (R = H or SiMe3) with AlCl3 afforded [AlCl(NR(8-C9H6N)]2] (R = H or SiMe3) respectively. The crystal structure of five-co-ordinate [AlCl(NH(8-C9H6N)}2] shows it to be monomeric in the solid state with intramolecular dative interactions between the aluminium centre and both aromatic nitrogen atoms. Treatment of NH(2-C5H4N)2 with [AlH3(NMe3)] yielded the six-co-ordinate complex [Al{N(2-C5H4N)(2-C5H4N)} 3], the crystal structure of which confirms it to be monomeric with intramolecular Al-N (aromatic) dative bonds from one pyridyl functionality of each amide ligand. In solution this complex exhibits fluxional behaviour which has been investigated by variable-temperature 1H NMR spectroscopy.

Original languageEnglish
Pages (from-to)3053-3057
Number of pages5
JournalJournal of the Chemical Society - Dalton Transactions
Issue number14
Publication statusPublished - 21 Jul 1996
Externally publishedYes


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