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Embedding and Positioning of Two Fe II 4 L 4 Cages in Supramolecular Tripeptide Gels for Selective Chemical Segregation
Author(s) -
Kieffer Marion,
Garcia Ana M.,
Haynes Cally J. E.,
Kralj Slavko,
Iglesias Daniel,
Nitschke Jonathan R.,
Marchesan Silvia
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201900429
Subject(s) - supramolecular chemistry , tripeptide , spectroscopy , crystallography , chemistry , nuclear magnetic resonance spectroscopy , molecule , raman spectroscopy , circular dichroism , diffusion , stereochemistry , organic chemistry , peptide , biochemistry , physics , quantum mechanics , optics , thermodynamics
An unreported d,l ‐tripeptide self‐assembled into gels that embedded Fe II 4 L 4 metal–organic cages to form materials that were characterized by TEM, EDX, Raman spectroscopy, rheometry, UV/Vis and NMR spectroscopy, and circular dichroism. The cage type and concentration modulated gel viscoelasticity, and thus the diffusion rate of molecular guests through the nanostructured matrix, as gauged by 19 F and 1 H NMR spectroscopy. When two different cages were added to spatially separated gel layers, the gel–cage composite material enabled the spatial segregation of a mixture of guests that diffused into the gel. Each cage selectively encapsulated its preferred guest during diffusion. We thus present a new strategy for using nested supramolecular interactions to enable the separation of small molecules.