New homo- and hetero-alkali metal alkoxide cages; crystal structures of [Me2N(CH2)2OLi]8 and [{Me2N(CH2)2O}12Li8K 6]O

Philip C. Andrews, Jonathan G. MacLellan, Robert E. Mulvey, Peter J. Nichols

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The reaction of N,N′-dimethylaminoethanol (DMAEH), (Me)2N(CH2)2OH, with nBuLi and nBuLi/nBuK respectively results in the formation of the homo- and hetero-metallic alkoxides [Me2N(CH2)2OLi]8, 1, and [{Me2N(CH2)2O}12Li8K 6]O, 2, rather than mixed alkyl-alkoxide species. From single crystal X-ray diffraction studies the two complexes are shown to be highly aggregated cage structures. Complex 1 (monoclinic, C2/c) adopts a rare octameric structure constructed from a ring stacked hexamer fused with a (LiO)2 dimer creating a sixteen vertex Li-O cluster. Complex 2, which crystallises (rhombohedral,R3̄) with thf and cyclohexane molecules in the lattice, forms a highly symmetrical, almost spherical, cage with an unprecedented Li:K ratio of 8:6.

Original languageEnglish
Pages (from-to)1651-1655
Number of pages5
JournalJournal of the Chemical Society, Dalton Transactions
Issue number8
Publication statusPublished - 23 Apr 2002

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