title: Synthesis, optical properties, and helical self-assembly of a bivaline-containing tetraphenylethene.
abstract: A chiral tetraphenylethene derivative with two valine-containing attachments (TPE-DVAL), was synthesized by Cu(I)-catalyzed azide-alkyne "click" reaction. The optical properties and self-assembling behaviours of TPE-DVAL were investigated. The molecule is non-emissive and circular dichroism (CD)-silent in solution, but shows strong fluorescence and Cotton effects in the aggregation state, demonstrating aggregation-induced emission (AIE) and CD (AICD) characteristics. TPE-DVAL exhibits good circularly polarized luminescence (CPL) when depositing on the surface of quartz to allow the evaporation of its 1,2-dichloroethane solution. SEM and TEM images of the molecule show that the molecule readily self-assembles into right-handed helical nanofibers upon the evaporation of its solvent of DCE. The molecular alignments and interactions in assembling process are further explored through XRD analysis and computational simulation. The driving forces for the formation of the helical fibers were from the cooperative effects of intermolecular hydrogen bonding, π-π interactions and steric effect.
authors.affiliation: Key Laboratory of New Lithium-Ion Battery and Mesoporous Material, Department of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.|Department of Chemistry, Institute for Advanced Study, Institute of Molecular Functional Materials, and State Key laboratory of Molecular Neuroscience, The Hong Kong University of Science &Technology, Clear Water Bay, Kowloon, Hong Kong, China.|Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China.
authors.forename: Hongkun
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Chemistry, Institute for Advanced Study, Institute of Molecular Functional Materials, and State Key laboratory of Molecular Neuroscience, The Hong Kong University of Science &Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Zheng
authors.affiliation: Department of Physics, HKUST, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Huimin
authors.initials: H
authors.lastname: Su
authors.affiliation: Department of Chemistry, Institute for Advanced Study, Institute of Molecular Functional Materials, and State Key laboratory of Molecular Neuroscience, The Hong Kong University of Science &Technology, Clear Water Bay, Kowloon, Hong Kong, China.|HKUST-Shenzhen Research Institute, No. 9 Yuexing 1st RD, South Area, Hi-tech Park, Nanshan, Shenzhen 518057, China.
authors.forename: Jacky W Y
authors.initials: JW
authors.lastname: Lam
authors.affiliation: Department of Physics, HKUST, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Kam
authors.initials: K
authors.lastname: Sing Wong
authors.affiliation: Key Laboratory of New Lithium-Ion Battery and Mesoporous Material, Department of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Xue
authors.affiliation: Key Laboratory of New Lithium-Ion Battery and Mesoporous Material, Department of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
authors.forename: Xuejiao
authors.initials: X
authors.lastname: Huang
authors.affiliation: Department of Chemistry, Institute for Advanced Study, Institute of Molecular Functional Materials, and State Key laboratory of Molecular Neuroscience, The Hong Kong University of Science &Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Xuhui
authors.initials: X
authors.lastname: Huang
authors.affiliation: Key Laboratory of New Lithium-Ion Battery and Mesoporous Material, Department of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
authors.forename: Bing Shi
authors.initials: BS
authors.lastname: Li
authors.affiliation: Department of Chemistry, Institute for Advanced Study, Institute of Molecular Functional Materials, and State Key laboratory of Molecular Neuroscience, The Hong Kong University of Science &Technology, Clear Water Bay, Kowloon, Hong Kong, China.|HKUST-Shenzhen Research Institute, No. 9 Yuexing 1st RD, South Area, Hi-tech Park, Nanshan, Shenzhen 518057, China.
authors.forename: Ben Zhong
authors.initials: BZ
authors.lastname: Tang