title: Self-discriminating termination of chiral supramolecular polymerization: tuning the length of nanofibers.
abstract: Directing the supramolecular polymerization towards a preferred type of organization is extremely important in the design of functional soft materials. Proposed herein is a simple methodology to tune the length and optical chirality of supramolecular polymers formed from a chiral bichromophoric binaphthalene by the control of enantiomeric excess (ee). The enantiopure compound gave thin fibers longer than a few microns, while the racemic mixture favored the formation of nanoparticles. The thermodynamic study unveils that the heterochiral assembly gets preference over the homochiral assembly. The stronger heterochiral binding over homochiral one terminated the elongation of fibrous assembly, thus leading to a control over the length of fibers in the nonracemic mixtures. The supramolecular polymerization driven by π-π interactions highlights the effect of the geometry of a twisted π-core on this self-sorting assembly.
authors: Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192 (Japan).
authors: Jatish
authors: J
authors: Kumar
authors: Hiroyuki
authors: H
authors: Tsumatori
authors: Junpei
authors: J
authors: Yuasa
authors: Tsuyoshi
authors: T
authors: Kawai
authors: Takuya
authors: T
authors: Nakashima
keywords: chirality; luminescence; polarized spectroscopy; self-assembly; supramolecular chemistry