Calix[4]arene Piperidinium Salt

In the crystal structure of piperidinium 26,27,28-trihydroxypentacyclo­[19.3.1.1^3,7.1^9,13.1^15,19]octacosa- 1(25),3,5,7(28),9,11,13 (27),15,17,19 (26),21,23-dodecaene-25-olate hemiacetonitrile solvate sesquihydrate, 2(C₅H₁₂N⁺·C₂₈H₂₄O₄⁻).3H₂O.CH₃CN, two molecules of calix[4]arene, two molecules of piperidinium, three molecules of water and one molecule of acetonitrile are observed in the asymmetric unit. They form an intricate network of intra- and intermolecular hydrogen bonds. Each calixarene molecule has a cone conformation. The H atoms of the piperidinium N⁺ atom are not directed towards the phenyl rings, indicateing that no (N⁺—H)...π interaction occurs.

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