title: Carbon dioxide fixation and sulfate sequestration by a supramolecular trigonal bipyramid.
abstract: The subcomponent self-assembly of a bent dialdehyde ligand and different cationic and anionic templates led to the formation of two new metallosupramolecular architectures: a Fe(II) 4 L6 molecular rectangle was isolated following reaction of the ligand with iron(II) tetrafluoroborate, and a M5 L6 trigonal bipyramidal structure was constructed from either zinc(II) tetrafluoroborate or cadmium(II) trifluoromethanesulfonate. The spatially constrained arrangement of the three equatorial metal ions in the M5 L6 structures was found to induce small-molecule transformations. Atmospheric carbon dioxide was fixed as carbonate and bound to the equatorial metal centers in both the Zn5 L6 and Cd5 L6 assemblies, and sulfur dioxide was hydrated and bound as the sulfite dianion in the Zn5 L6 structure. Subsequent in situ oxidation of the sulfite dianion resulted in a sulfate dianion bound within the supramolecular pocket.
authors.affiliation: University of Cambridge, Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW (UK) http://www-jrn.ch.cam.ac.uk/|Current address: School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL (UK).
authors.forename: Colm
authors.initials: C
authors.lastname: Browne
authors.affiliation: University of Cambridge, Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW (UK) http://www-jrn.ch.cam.ac.uk/
authors.forename: William J
authors.initials: WJ
authors.lastname: Ramsay
authors.affiliation: University of Cambridge, Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW (UK) http://www-jrn.ch.cam.ac.uk/
authors.forename: Tanya K
authors.initials: TK
authors.lastname: Ronson
authors.affiliation: University of Cambridge, Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW (UK) http://www-jrn.ch.cam.ac.uk/
authors.forename: John
authors.initials: J
authors.lastname: Medley-Hallam
authors.affiliation: University of Cambridge, Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW (UK) http://www-jrn.ch.cam.ac.uk/. jrn34@cam.ac.uk.
authors.forename: Jonathan R
authors.initials: JR
authors.lastname: Nitschke
keywords: carbon dioxide fixation; host-guest systems; small-molecule transformations; supramolecular chemistry; template synthesis