Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/75915

Synthesis, optical properties, and helical self-assembly of a bivaline-containing tetraphenylethene

Authors Li, Hongkun HKUST affiliated (currently or previously)
Zheng, Xiaoyan HKUST affiliated (currently or previously)
Su, Huimin HKUST affiliated (currently or previously)
Lam, Wing Yip View this author's profile
Wong, Kam Sing View this author's profile
Xue, Shan
Huang, Xuejiao
Huang, Xuhui View this author's profile
Li, Bing Shi
Tang, Ben Zhong View this author's profile
Issue Date 2016
Source Scientific Reports , v. 6, January 2016, article number 19277
Summary 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, €- € interactions and steric effect.
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ISSN 2045-2322
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