A redox responsive, fluorescent supramolecular metallohydrogel consists of nanofibers with single-molecule width
KAUST DepartmentImaging and Characterization Core Lab
Physical Sciences and Engineering (PSE) Division
Advanced Nanofabrication, Imaging and Characterization Core Lab
Materials Science and Engineering Program
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AbstractThe integration of a tripeptide derivative, which is a versatile self-assembly motif, with a ruthenium(II)tris(bipyridine) complex affords the first supramolecular metallo-hydrogelator that not only self assembles in water to form a hydrogel but also exhibits gel-sol transition upon oxidation of the metal center. Surprisingly, the incorporation of the metal complex in the hydrogelator results in the nanofibers, formed by the self-assembly of the hydrogelator in water, to have the width of a single molecule of the hydrogelator. These results illustrate that metal complexes, besides being able to impart rich optical, electronic, redox, or magnetic properties to supramolecular hydrogels, also offer a unique geometrical control to prearrange the self-assembly motif prior to self-assembling. The use of metal complexes to modulate the dimensionality of intermolecular interactions may also help elucidate the interactions of the molecular nanofibers with other molecules, thus facilitating the development of supramolecular hydrogel materials for a wide range of applications. © 2013 American Chemical Society.
SponsorsThis work was partially supported by a grant from the Army Research Office (ARO 56735-MS), a National Science Foundation MRSEC Grant (DMR-0820492), NIH (R01 CA142746), and start-up funds from Brandeis University. The TEM images were taken at the EM facility of Brandeis University.
PublisherAmerican Chemical Society
PubMed Central IDPMC3758904
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