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Helical Nanostructures: Chirality Transfer and a Photodriven Transformation from Superhelix to Nanokebab
Author(s) -
Jiang Hejin,
Jiang Yuqian,
Han Jianlei,
Zhang Li,
Liu Minghua
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201811060
Subject(s) - chirality (physics) , helicity , supramolecular chirality , nanostructure , moiety , chemistry , conjugated system , fluorescence , molecule , photochemistry , materials science , nanotechnology , supramolecular chemistry , stereochemistry , organic chemistry , optics , physics , polymer , chiral symmetry breaking , particle physics , quantum mechanics , nambu–jona lasinio model , quark
Photosensitive cinnamic acid conjugated glutamides were designed to demonstrate photocontrolled hierarchical chirality transfer and switching in self‐assembled systems. In methanol, the cinnamic acid derivatives self‐assembled into superhelices, which could be switched into nanokebabs upon UV irradiation. These two nanostructures showed opposite helicity. The chiral nanostructures could further convey their chirality to achiral fluorescent molecules and result in the emission of circularly polarized luminescence (CPL). Remarkably, the CPL followed the helicity of the chiral nanostructure rather than the inherent molecular chirality. Photodriven dimerization of the cinnamic moiety lead to a significant change in molecular packing and subsequent switching of the helicity of the formed nanostructures.