In triaquadioxobis (trifluoromethanesulfonato)uranium(VI)-benzo-15-crown-5 (1/2), [UO2(CF3SO3)(2)(H2O)(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 CF3SO3- 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.

The X-ray analysis of the title compound, C17H20O4, allows the assignment of the trans (synclinal) relationship between the C(3) and C(4) substituents of the lactone ring. Moreover, it indicates that the heterocyclic ring assumes a boat conformation and elucidates the conformations of the aroyl and allylic groups.

The structures of two compounds involving the macrocycle 1,4,10,13-tetraoxa-7,1 6-diazacyclooctadecane (diaza-18-crown-6, C12H26N2O4) are reported. In 1,4,10,13-tetraoxa-7,16-diazoniacyclooctadecane bis(trifluoromethanesulfonate), C12H28-N2O42+.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 trifluoromethanesulfonate, [UO2(C12H25N2O4)]CF3SO3, (II), is composed of [UO2(diaza-18-crown-6)](+) cations and CF3SO3- anions. The linear uranyl moiety is included into the macrocycle with hexagonalbipyramidal 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.

UO2(NO3)(2) reacts with p-tert-butylcalix[8]arene, deprotonated with triethylamine as base, in acetonitrile to give the bimetallic complex mu-hydroxo-1:2 kappa(2)O-mu-[5,11,17,23,29,35,41,47-octa-tert-butylnona- cyclo[43.3.1.1(3,7).1(9,13).1(15,19).1(21,25).1(27,31).1(33,37).1(39,43)]hexa- pentaconta-1(49),3,5,7(56),9,11,13(55),15,17,19,(54),- 21,23,25(53),27,29,31(52),33,35,37(51),39,41,43,(50),- 45,47-tetracosaene-49,50,51,52,53,54,55,56-octolato-1 kappa(4)O(49) (,50,51,52) :2 kappa(4)O(53,54,55,56)] bis[dioxouranium(VI)] with bis(triethylammonium) hydroxide bis(triethylamine) trihydrate tetraacetonitrile solvate, (C6H16N)(2)[(UO2)(2)-(C88H108O8 )(OH)](OH).2C(6)H(15)N.3H2O.4C(2)H(3)N. The two uranyl ions are included in the fourfold deprotonated macrocycle, each of them being bonded to four phenolic O atoms, with a bridging hydroxyl ion ensuring the five-coordinate equatorial environment usual for a uranyl ion, A protonated triethylamine molecule is hydrogen bonded to one O atom of each uranyl moiety,

The structures of the two compounds reported here involve the tetraprotonated form of the macrocycle 1,4,7,10,13,16-hexaazacyclooctadecane (hexaaza-18-crown-6 = C12H30N6): (H-4-hexaaza-18-crown-6).4(trifluoromethanesulfonate), C12H34N64+.4CF(3)SO(3)(-), and the hydrated form (H-4-hexaaza-18-crown-6).4(trifluoromethanesulfonate).H2O, C12H34N64+.4CF(3)SO(3)(-).H2O. In both compounds, the conformation of the macrocycle is g(+)g(-)g(+)g(-)g(+)g(-). The counterions and the water molecule are hydrogen bonded to protonated N atoms.

In the title compound, [UO2(SO4)(C(3)H(7)N0)(2)], the uranyl ion is in a pentagonal pseudo-planar equatorial environment, comprising two dimethylformamide and three sulfate O atoms. The uranyl ions are bridged by sulfate groups, giving rise to an infinite chain structure, i.e, catena-poly[(NN-dimethylformamide)dioxouranium-mu-sulfato-O,O':O '']. Two of the sulfate O atoms are bonded to the same uranyl ion in a coordination mode previously not observed in uranyl sulfates.

The uranyl ion in pentaaquadioxouranium(VI) bis(trifluoromethanesulfonate)-1,4,7,10,13,16-hexaoxacyclooctadecane, [UO2(H2O)5](CF3SO3)2.C12H24O6, is equatorially surrounded by five O atoms from water molecules. The CF3SO3- ions and the crown ether are not part of the uranyl coordination polyhedron but are linked to the U atom via hydrogen bonds.

The title complex, (1,4,7,10,13,16-hexaazacyclooctadecane)dioxouranium bis(trifluoromethylsulfonate), [UO 2 (C 12 H 30 N 6 )] 2+ .2CF 3 SO 3 - , is composed of [UO 2 (18-azacrown-6)] 2+ and CF 3 SO 3 - ions. In the cation, the uranyl is bonded to the six N atoms of the crown in a hexagonal bipyramidal coordination. This is the first reported uranyl hexaazacrown inclusion complex