Acta Cryst. (2013). E69, m147
[ doi:10.1107/S1600536813003553 ]

catena-Poly[[(tetrahydrofuran-O)potassium]-di--dimethylamido-⁴N:N-aluminium-di--dimethylamido-⁴N:N-potassium-di--dimethylamido-⁴N:N-aluminium-di--dimethylamido-⁴N:N]

A. Purdy and D. Parrish

Abstract: The title compound, [Al₂K₂(C₂H₆N)₈(C₄H₈O)]_n, formed during the sonochemical reaction between Al(NMe₂)₃ and sodium-potassium alloy in the presence of tetrahydrofuran (THF). Its asymmetric unit has two inequivalent K⁺ sites. One site is coordinated by a THF ligand, and crystallizes as a one-dimensional polymer with a backbone of catenated AlN₂K rings. A twofold rotation axis bisects one K⁺ site and the THF ligand; the second K⁺ site is situated on an inversion centre, resulting in a planar four-coordination by N atoms. The latter symmetry operation generates the second half of the THF molecule and fills out the coordination sphere of the potassium sites. The chains extend along the c-axis direction and zigzag at the THF-coordinated K⁺ sites by an angle of 106.02 (5)°.

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