Potassium chlorido­tris­(hypersil­oxy)aluminate dimer

The tris­(tri­methyl­silylsiloxide) ligand, also known as hypersiloxide, is an extremely bulky group. In an attempt to make the monomeric Al(OSi(SiMe(3))(3))(3), AlCl(3) was combined with 3 equiv. of potassium hypersiloxide. The crystalline product isolated (40% yield), namely di-μ(3)-chlorido-bis­[μ(2)-tris­(tri­methyl­sil­yl)silanolato]tetra­kis­[tris­(tri­methyl­sil­yl)silanolato]dialuminium­dipotassium, [Al(2)K(2)Cl(2)(C(19)H(27)OSi(4))(6)], is a KCl adduct of aluminium tris(hypersilyloxide) that is dimerized through a planar K(2)Cl(2) ring, with K—Cl distances of 3.1131 (8) and 3.319 (3) Å, and ring angles of 77.41 (2) and 102.60 (2)°. This ring is on an inversion center, and there is no supra­molecular coordination.