The structures of two compounds involving the macrocycle 1, 4, 10, 13-tetraoxa-7, 16-diazacyclooctadecane (diaza-18-crown-6, C 12 H 26 N 2 O 4 ) are reported. In 1, 4, 10, 13-tetraoxa-7, 16-diazoniacyclooctadecane bis(trifluoromethanesulfonate), C 12 H 28 N 2 O 4 2+ .2CF 3 SO 3 − , (I), the two N atoms are protonated, resulting in a ring conformation different to that of the neutral crown. The second compound, dioxo[1, 4, 10, 13-tetraoxa-7, 16-diazocyclooctadecanido(1 −)]uranium trifluoromethane-sulfonate, [UO 2 (C 12 H 25 N 2 O 4 )]CF 3 SO 3 , (II), is composed of [UO 2 (diaza-18-crown-6)] + cations and CF 3 SO 3 − anions. The linear uranyl moiety is included into the macrocycle with hexagonal-bipyramidal coordination geometry; one of the N atoms is deprotonated and the two N atoms are thus at different distances from the U atom and have different geometries
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Thuéry et al. (1995) studied this question.