Acta Cryst. (2007). E63, m1480-m1481  [ doi:10.1107/S1600536807019435 ]

[-Cucurbit[6]uril(2-)]bis[pentaaquacalcium(II)] bis[tetrachloridozincate(II)] heptahydrate

Y. Shao, Y.-Z. Li, J.-P. Shi and G.-Y. Lu

Abstract: In the title compound, [Ca₂(C₃₆H₃₆N₂₄O₁₂)(H₂O)₁₀][ZnCl₄]₂·7H₂O, each cucurbit[6]uril molecule is coordinated to two calcium cations as a tetradentate ligand. Each calcium cation is coordinated by two neighboring carbonyl O atoms at a portal of the same cage. Heptacoordination of the calcium cation is completed with five water molecules. The transition-metal salt anion [ZnCl₄]^2- acts as a counter-ion. The cation is centrosymmetric. The crystal structure involves O-HO and O-HCl hydrogen bonds. One of the water molecules is disordered, with an occupancy of 0.5.

Online 25 April 2007

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