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Self‐Assembly and (Hydro)gelation Triggered by Cooperative π–π and Unconventional CH⋅⋅⋅X Hydrogen Bonding Interactions
Authors:Christina Rest  Dr. María José Mayoral  Dr. Katharina Fucke  Jennifer Schellheimer  Dr. Vladimir Stepanenko  Dr. Gustavo Fernández
Affiliation:1. Institut für Organische Chemie and Center for Nanosystems Chemistry, Universit?t Würzburg, Am Hubland, 97074 Würzburg (Germany) http://www‐organik.chemie.uni‐wuerzburg.de/lehrstuehlearbeitskreise/fernandez;2. Institut für Anorganische Chemie, Universit?t Würzburg, Am Hubland, 97074 Würzburg (Germany)
Abstract:Weak C? H???X hydrogen bonds are important stabilizing forces in crystal engineering and anion recognition in solution. In contrast, their quantitative influence on the stabilization of supramolecular polymers or gels has thus far remained unexplored. Herein, we report an oligophenyleneethynylene (OPE)‐based amphiphilic PtII complex that forms supramolecular polymeric structures in aqueous and polar media driven by π–π and different weak C‐H???X (X=Cl, O) interactions involving chlorine atoms attached to the PtII centers as well as oxygen atoms and polarized methylene groups belonging to the peripheral glycol chains. A collection of experimental techniques (UV/Vis, 1D and 2D NMR, DLS, AFM, SEM, and X‐Ray diffraction) demonstrate that the interplay between different weak noncovalent interactions leads to the cooperative formation of self‐assembled structures of high aspect ratio and gels in which the molecular arrangement is maintained in the crystalline state.
Keywords:amphiphiles  cooperativity  supramolecular polymerization  X–  H hydrogen bonds  π  ‐conjugated systems
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