title: Cluster control in oligouranyl complexes of p-t-butylcalix[8]arene.
abstract: Formation of uranyl ion complexes of p-t-butylcalix[8]arene by reaction of the calixarene with [UO(2)(dmso)(5)](2+) in the presence of various bases leads to the crystallisation of solids with interestingly different stoichiometry, involving both di- and tri-uranate oligomers bound to the calixarene in anionic species. In all, the calixarene hexa-anion is present in a virtually identical conformation, suggesting that conformational preferences of the ligand must be a major factor controlling the form of the bound oxo-metal complex. Hydrogen bonding to the anions does not appear to be prominent even in the presence of protonated amines and this may explain the formation of some remarkable cation/solvent/simple anion clusters found within the lattices.
authors.affiliation: Institut de Science et d'Ingénierie Supramoléculaires, Université de Strasbourg, 67083, Strasbourg, France.
authors.forename: Jack M
authors.initials: JM
authors.lastname: Harrowfield
authors.forename: Mark I
authors.initials: MI
authors.lastname: Ogden
authors.forename: Brian W
authors.initials: BW
authors.lastname: Skelton
authors.forename: Allan H
authors.initials: AH
authors.lastname: White