title: Inversion of supramolecular helicity in oligo-p-phenylene-based supramolecular polymers: influence of molecular atropisomerism.
abstract: The helical organization of oligo-p-phenylene-based organogelators has been investigated by atomic force microscopy, circular and vibrational circular dichroism, and Raman techniques. Whilst OPPs with more than two phenyl rings in the core self-assemble into left-handed helices, that with a biphenyl core shows an inversion of the supramolecular helicity depending on the formation conditions through the atropisomerism of the biphenyl central unit. The results presented herein outline a new example of kinetically controlled modulation of supramolecular helicity.
authors.affiliation: Departamento de Química Orgánica, Facultad de Ciencias Químicas, Ciudad Universitaria s/n, 28040 Madrid (Spain).
authors.forename: Fátima
authors.initials: F
authors.lastname: Aparicio
authors.forename: Belén
authors.initials: B
authors.lastname: Nieto-Ortega
authors.forename: Francisco
authors.initials: F
authors.lastname: Nájera
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Ramírez
authors.forename: Juan T
authors.initials: JT
authors.lastname: López Navarrete
authors.forename: Juan
authors.initials: J
authors.lastname: Casado
authors.forename: Luis
authors.initials: L
authors.lastname: Sánchez
keywords: atropisomerism; chirality; helical structures; self-assembly; supramolecular polymers