title: Anion exchange dynamics in the capture of perchlorate by a cationic Ag-based MOF.
abstract: We report a detailed study of the host-guest interaction for a cationic metal-organic framework that can reversibly capture perchlorate. The structural transformation and flexibility of silver 4,4'-bipyridine nitrate (SBN) upon formation of silver 4,4'-bipyridine perchlorate (SBP) was evaluated by monitoring the anion exchange dynamics using a combination of powder X-ray diffraction (PXRD) with multinuclear13C,15N and109Ag solid-state NMR spectra at different time intervals of the anion exchange. The structural transformation from SBN to SBP is complete within 70 minutes and was determined to take place by a solvent-mediated process. This pathway is confirmed by the morphological changes of the two crystalline materials observed by SEM. This key understanding may lead to application of this material towards perchlorate capture.
authors.affiliation: University of California, Santa Cruz, Department of Chemistry and Biochemistry, 1156 High Street, Santa Cruz, California 95064, USA. soliver@ucsc.edu.
authors.forename: Ian R
authors.initials: IR
authors.lastname: Colinas
authors.affiliation: Department of Chemistry, Stephenson Institute for Renewable Energy, University of Liverpool, L69 7ZD, UK. frederic.blanc@liverpool.ac.uk.
authors.forename: Kenneth K
authors.initials: KK
authors.lastname: Inglis
authors.affiliation: Department of Chemistry, Stephenson Institute for Renewable Energy, University of Liverpool, L69 7ZD, UK. frederic.blanc@liverpool.ac.uk.
authors.forename: Frédéric
authors.identifier: http://orcid.org/0000-0001-9171-1454
authors.initials: F
authors.lastname: Blanc
authors.affiliation: University of California, Santa Cruz, Department of Chemistry and Biochemistry, 1156 High Street, Santa Cruz, California 95064, USA. soliver@ucsc.edu.
authors.forename: Scott R J
authors.identifier: http://orcid.org/0000-0002-6160-1518
authors.initials: SRJ
authors.lastname: Oliver