Enabling Light Work in Helical Self-Assembly for Dynamic Amplification of Chirality with Photoreversibility

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• 作者：Yunsong Cai ; Zhiqian Guo ; Jianmei Chen ; Wenlong Li ; Liubiao Zhong ; Ya Gao ; Lin Jiang ; Lifeng Chi ; He Tian ; Wei-Hong Zhu
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：February 24, 2016
• 年：2016
• 卷：138
• 期：7
• 页码：2219-2224
• 全文大小：469K
• ISSN：1520-5126

文摘

Light-driven transcription and replication are always subordinate to a delicate chirality transfer. Enabling light work in construction of the helical self-assembly with reversible chiral transformation becomes attractive. Herein we demonstrate that a helical hydrogen-bonded self-assembly is reversibly photoswitched between photochromic open and closed forms upon irradiation with alternative UV and visible light, in which molecular chirality is amplified with the formation of helixes at supramolecular level. The characteristics in these superhelixes such as left-handed or right-handed twist and helical length, height, and pitch are revealed by SEM and AFM. The helical photoswitchable nanostructure provides an easily accessible route to an unprecedented photoreversible modulation in morphology, fluorescence, and helicity, with precise assembly/disassembly architectures similar to biological systems such as protein and DNA.