Acta Cryst. (2007). E63, m2477  [ doi:10.1107/S1600536807033922 ]

A polymeric mixed-metal hexamethyldisilazide

J. J. Morris, B. C. Noll and K. W. Henderson

Abstract: The title compound, catena-poly[[₂-bis(trimethylsilyl)amido-²N:N]-lithium(I)-[₂-bis(trimethylsilyl)amido-²N:N]potassium], [LiK(C₆H₁₈NSi₂)₂]_n or [{(Me₃Si)₂NLi}{(Me₃Si)₂NK}], is a polymeric one-dimensional chain composed of alternating lithium and potassium centers bridged through the amide N atoms of the hexamethyldisilazide anions. The repeat unit is centrosymmetric, with K on a center of symmetry, Li on a twofold rotation axis, and the complete hexamethydisilazide anion in the asymmetric unit. All of the methyl C atoms in the hexamethyldisilazide anion are disordered over two sites, with the site occupancies refined to 0.63 (2) for the major component of one trimethylsilyl group and 0.54 (3) for the major component of the second trimethylsilyl group.

Online 8 September 2007

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