In triaquadioxobis(trifluoromethanesulfonato)uranium-(VI)-benzo-15-crown-5 (1/2), [UO 2 (CF 3 SO 3 ) 2 (H 2 O) 3 ].2C 14 H 20 O 5 , the uranyl ion is in a pentagonal pseudo-planar equatorial environment, consisting of two O atoms from two trifluoromethanesulfonate (triflate) ions and three from water molecules. The coordination of CF 3 SO 3 - is particularly notable owing to the poor coordinating character of this ion. Two molecules of benzo-15-crown-5 are hydrogen bonded to the water molecules (one water molecule bridging) without any direct interaction with the uranyl moiety.
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Thuéry et al. (1995) studied this question.