title: Two-Component Self-Assemblies: Investigation of a Synergy between Bisurea Stickers.
abstract: It is of interest to develop two-component systems for added flexibility in the design of supramolecular polymers, nanofibers, or organogels. Bisureas are known to self-assemble by hydrogen bonding into long supramolecular objects. We show here that mixing aromatic bisureas with slightly different structures can yield surprisingly large synergistic effects. A strong increase in viscosity is observed when a bisurea with the sterically demanding 2,4,6-trimethylbenzene spacer is combined with a bisurea bearing no methyl group in position 2 of the aromatic spacer (i.e., 4-methylbenzene or 4,6-dimethylbenzene). This effect is the consequence of a change in the supramolecular assembly triggered by the composition of the mixture. The mixture of complementary bisureas forms rodlike objects that are more stable by about 1 kJ/mol and that are thicker than the rodlike objects formed by both parent systems.
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS , Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères, 4 Place Jussieu, Paris F-75005, France.
authors.forename: Emilie
authors.initials: E
authors.lastname: Ressouche
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS , Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères, 4 Place Jussieu, Paris F-75005, France.
authors.forename: Sandrine
authors.initials: S
authors.lastname: Pensec
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS , Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères, 4 Place Jussieu, Paris F-75005, France.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Isare
authors.affiliation: Laboratoire Léon Brillouin, UMR 12 CNRS-CEA , Gif-sur-Yvette Cedex 91191, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Jestin
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS , Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères, 4 Place Jussieu, Paris F-75005, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Bouteiller