Fu Xue-qun, Yang Yong-le, Ye Qiong
Ordered Matter Science Research Center, Southeast University, Nanjing 210096, People's Republic of China.
Acta Crystallogr C. 2010 Aug;66(Pt 8):o433-5. doi: 10.1107/S0108270110027630. Epub 2010 Jul 28.
In the structure of the complex of dibenzo-18-crown-6 [systematic name: 2,5,8,15,18,21-hexaoxatricyclo[20.4.0.0(9,14)]hexacosa-1(26),9,11,13,22,24-hexaene] with 4-methoxyanilinium tetrafluoroborate, C(7)H(10)NO(+) x BF(4)(-) x C(20)H(24)O(6), the protonated 4-methoxyanilinium (MB-NH(3)(+)) cation forms a 1:1 supramolecular rotator-stator complex with the dibenzo-18-crown-6 molecule via N-H...O hydrogen bonds. The MB-NH(3)(+) group is attached from the convex side of the bowl-shaped crown, in contrast with similar ammonium cations that nest in the curvature of the bowl. The cations are associated via C-H...pi interactions, while the cations and anions are linked by weak C-H...F hydrogen bonds, forming cation-crown-anion chains parallel to [011].
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