LAUSR

Reaction of uranyl nitrate with cucurbit[6]uril (CB6) and carboxylic or sulfonic acid ligands under hydrothermal conditions and in the presence of additional metal cations (KI or CeIII) or co-solvents provided four complexes which were crystallographically characterized. [(UO2)2K2(CB6)(adc)2(NO3)2-(H2O)2]5H2O (1), where H2adc is 1,3-adamantanedicarboxylic acid, crystallizes in the form of a central K2(CB6)2+ column surrounded by two one-dimensional (1D) polymeric UO2(adc)(NO3)- chains attached to the column by nitrate bridges, with a perfect match of the repeat lengths in the two subunits. The longer 1,3-adamantanediacetic acid (H2adac) gives the complex [(UO2)2(adac)2(HCOOH)2]CB66H2O (2) in which the 1D uranyl-containing polymer and columns of CB6 molecules form a layered arrangement held by weak CHO hydrogen bonds. The complex formed with the di-potassium salt of methanedisulfonic acid (K2mds), [(UO2)2K2(CB6)(mds)2(OH)2(H2O)8]4H2O (3), is a 1D polymer in which K2(CB6)2+ units are connected to one another by doubly hydroxide-bridged uranyl dimers in which the disulfonates are terminal, chelating ligands; connection between the two subunits is solely through potassium oxo-bonding to uranyl. The complex [(UO2)2Ce2(CB6)(C2O4)3(NO3)4(H2O)6]2H2O (4) is a 1D polymer containing bridging oxalate ligands formed in situ, in which CB6 is coordinated to the lanthanide cation only.