Springer Online Journal Archives 1860-2000
Abstract The title compound was prepared by the addition of A1Me3 to a suspension of 18-crown-6 inp-xylene. The large, colorless, air-sensitive crystals belong to the monoclinic space group P21/n witha=14.822(6),b=7.894(4),c=18.805(6) Å,β=105.40(4)°, andD calc=1.03 g cm−3 forZ=2. The finalR value based on 1758 observed reflections is 0.043. The molecule lies on a crystallographic inversion center and exhibits four strong Al-O bonds. The two independent Al-O distances are 1.978(3) and 2.000(3) Å. The oxygen atoms deviate from the mean plane of the crown, alternating above and below, by 0.13, 0.15, and 0.20 Å, respectively. Thep-xylene molecule is also positioned about a center of inversion.
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