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The title compound, [Al 2 K 2 (C 2 H 6 N) 8 (C 4 H 8 O)]  n  , formed during the sonochemical reaction between Al(NMe 2 ) 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 AlN 2 K 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)°.

acta crystallographica. section e

catena-Poly[[(tetrahydrofuran-κO)potassium]-di-μ-dimethylamido-κ4N:N-aluminium-di-μ-dimethylamido-κ4N:N-potassium-di-μ-dimethylamido-κ4N:N-aluminium-di-μ-dimethylamido-κ4N:N]