title: Inorganic crown: the host-guest chemistry of a high nuclearity 'Celtic-ring' isopolyoxotungstate [H12W36O120]12-.
abstract: A range of complexes based on the high-nuclearity [W36] isopolyoxotungstate cluster, [H12W36O120]12-, with a triangular topology has been isolated by using the organic cation, protonated triethanolamine. In analogy to an 18-crown-6 crown ether with six oxygen donors on a ring, the cluster can form alkali and alkaline earth metal complexes [M within W36] (M = K+, Rb+, Cs+, NH4+, Sr2+ and Ba2+, 1-6, respectively). Compounds 1-6 were characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy. Comparisons between the structures of 1-6 and 18-crown-6 as well as the symmetry directing influence of the organo-cations in the isolation of the overall cluster architecture are discussed.
authors.affiliation: WestCHEM, Department of Chemistry, University of Glasgow, Glasgow, UKG12 8QQ.
authors.forename: De-Liang
authors.initials: DL
authors.lastname: Long
authors.forename: Oliver
authors.initials: O
authors.lastname: Brücher
authors.forename: Carsten
authors.initials: C
authors.lastname: Streb
authors.forename: Leroy
authors.initials: L
authors.lastname: Cronin