title: Self-assembly and (hydro)gelation triggered by cooperative π-π and unconventional C-H···X hydrogen bonding interactions.
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 Pt(II) 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 Pt(II) 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.
authors.affiliation: Institut für Organische Chemie and Center for Nanosystems Chemistry, Universität Würzburg, Am Hubland, 97074 Würzburg (Germany) http://www-organik.chemie.uni-wuerzburg.de/lehrstuehlearbeitskreise/fernandez.
authors.forename: Christina
authors.initials: C
authors.lastname: Rest
authors.forename: María José
authors.initials: MJ
authors.lastname: Mayoral
authors.forename: Katharina
authors.initials: K
authors.lastname: Fucke
authors.forename: Jennifer
authors.initials: J
authors.lastname: Schellheimer
authors.forename: Vladimir
authors.initials: V
authors.lastname: Stepanenko
authors.forename: Gustavo
authors.initials: G
authors.lastname: Fernández
mesh_terms: D000480:Alkynes / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D002713:Chlorine / Q000737:chemistry; D056831:Coordination Complexes / Q000737:chemistry; D004987:Ethers / Q000737:chemistry; D005782:Gels / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry*; D006860:Hydrogen Bonding; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry; D011789:Quantum Theory; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000480:Alkynes; D056831:Coordination Complexes; D004987:Ethers; D005782:Gels; C436384:phenyleneethynylene; D014867:Water; D010984:Platinum; D002713:Chlorine; D002244:Carbon; D006859:Hydrogen; D010100:Oxygen
keywords: X-H hydrogen bonds; amphiphiles; cooperativity; supramolecular polymerization; π-conjugated systems