Crystal Structure of the Uranyl Ion Complex of p-tert-Butylcalix[7]arene
- 1 October 1998
- journal article
- research article
- Published by Taylor & Francis Ltd in Supramolecular Chemistry
- Vol. 9 (4), 297-303
- https://doi.org/10.1080/10610279808034999
Abstract
The synthesis and crystal structure of the uranyl ion complex of p-tert-butylcalix[7]arene are reported. (UO2 2+)(LH3 4-)(HNEt3 +)2·CH3NO2·CH3OH (1), in which LH7 is p-tert-butylcalix[7]arene, crystallizes in the monoclinic space group P21/ c , a = 22.515(6), b = 27.660(5), c = 18.608(6) Å, β = 113.98(2)°, V = 10588(10) Å3, Z = 4. Refinement led to a final conventional R value of 0.082 for 6784 reflections. The calixarene adopts the same geometry as in its uncomplexed form, i.e., it may be considered a ditopic receptor formed by the angular fusion of two cone-like cavities involving four and three phenolic units. The uranyl ion is at the centre of the base of the larger cavity and is bound to four deprotonated oxygen atoms in its equatorial plane.Keywords
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