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 multinuclear ¹³C, ¹⁵N and ¹⁰⁹Ag 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 understa

SUBMITTER: Colinas IR 

PROVIDER: S-EPMC5533595 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature