1609200-02-3Relevant academic research and scientific papers
Self-assembly and (hydro)gelation triggered by cooperative π-π And unconventional C-H×××X hydrogen bonding interactions
Rest, Christina,Mayoral, María José,Fucke, Katharina,Schellheimer, Jennifer,Stepanenko, Vladimir,Fernández, Gustavo
, p. 700 - 705 (2014/01/23)
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. Growing hand in hand! Multiple unconventional C-H×××X (X=O, Cl) hydrogen-bonding interactions, assisted by π-π interactions, are strong enough to drive the cooperative formation of supramolecular polymers and gels in polar and aqueous media. The aggregates consolidate themselves in the crystals, as shown by combined studies in solution and crystalline state. Copyright
