title: Evolution from lyotropic liquid crystal to helical fibrous organogel of an achiral fluorescent twin-tapered bi-1,3,4-oxadiazole derivative.
abstract: We report an unprecedented hierarchical self-assembly of an achiral twin-tapered bi-1,3,4-oxadiazole derivative (2,2-bis(3,4,5-trioctanoxyphenyl)-bi-1,3,4-oxadiazole, BOXD-T8). This molecule can form a layer-structured lyotropic liquid crystal and further forms a helical fibrous organogel in DMF at concentrations above 0.6 wt %. The self-assembly process of BOXD-T8 in DMF is accompanied by a change in its fluorescence. The pitches of the helical fibers are non-uniform, and both left- and right-handed helical fibers are observed in equal quantities. Intermolecular π-π interactions between aromatic segments have been demonstrated to be the driving force for aggregate formation. This helical structure of BOXD-T8 is dependent on the solvent, concentration, and the layer-structured intermediate liquid-crystalline state.
authors.affiliation: Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China.
authors.forename: Songnan
authors.initials: S
authors.lastname: Qu
authors.forename: Lijun
authors.initials: L
authors.lastname: Wang
authors.forename: Xingyuan
authors.initials: X
authors.lastname: Liu
authors.forename: Min
authors.initials: M
authors.lastname: Li
mesh_terms: D002942:Circular Dichroism; D050866:Liquid Crystals / Q000737:chemistry*; D015394:Molecular Structure; D010069:Oxadiazoles / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: C558417:(2,2-bis(3,4,5-trioctanoxyphenyl)-bi-1,3,4-oxadiazole); D010069:Oxadiazoles; D012997:Solvents