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Issue 8, 2002
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New homo- and hetero-alkali metal alkoxide cages; crystal structures of [Me2N(CH2)2OLi]8 and [{Me2N(CH2)2O}12Li8K6]O

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Abstract

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}12Li8K6]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, R[3 with combining macron]) with thf and cyclohexane molecules in the lattice, forms a highly symmetrical, almost spherical, cage with an unprecedented Li ∶ K ratio of 8 ∶ 6.

Graphical abstract: New homo- and hetero-alkali metal alkoxide cages; crystal structures of [Me2N(CH2)2OLi]8 and [{Me2N(CH2)2O}12Li8K6]O

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Publication details

The article was received on 29 Nov 2001, accepted on 12 Feb 2002 and first published on 25 Mar 2002


Article type: Paper
DOI: 10.1039/B110708A
Citation: J. Chem. Soc., Dalton Trans., 2002, 1651-1655
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    New homo- and hetero-alkali metal alkoxide cages; crystal structures of [Me2N(CH2)2OLi]8 and [{Me2N(CH2)2O}12Li8K6]O

    P. C. Andrews, J. G. MacLellan, R. E. Mulvey and P. J. Nichols, J. Chem. Soc., Dalton Trans., 2002, 1651
    DOI: 10.1039/B110708A

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