Acta Cryst. (2003). E59, m64-m66  [ doi:10.1107/S1600536803001193 ]

A triclinic polymorph of octa-tert-butoxytetralithiumtetrasodium

W. Clegg, A. M. Drummond, S. T. Liddle and R. E. Mulvey

Abstract: The title compound, tetra-₃-tert-butoxy-tetra-₄-tert-butoxy-tetralithiumtetrasodium, [Li₄Na₄(C₄H₉O)₈], has been obtained in a second, triclinic, modification, with three crystallographically independent molecules in the asymmetric unit. All three molecules, as well as the two independent molecules of a previously reported monoclinic polymorph, have essentially the same structure, in which the tert-butoxy ligands are either triply or quadruply bridging, Li⁺ cations have trigonal pyramidal coordination, and Na⁺ cations have irregular fourfold coordination. The molecules have no crystallographic symmetry, but approximate to 2m (D_2d) symmetry.

Online 24 January 2003

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