Solid-State Photochromic Molecular Switches Based on Axially Chiral and Helical Spiropyrans
Lang Qu, Xuemei Xu, Jintong Song, Dehua Wu, Lei Wang, Weilan Zhou, Xiangge Zhou, Haifeng Xiang*, Dyes Pigments, doi: 10.1016/j.dyepig.2020.108597.
https://doi.org/10.1016/j.dyepig.2020.108597.
Solid-state photochromic switches with reversible luminescence modulation property have wide applications in optical data storage, anticounterfeiting, sensing, and bioimaging, however, it is a significant challenge to design and prepare such materials. In the present work, a novel class of chiral and helical binaphthyl-substituted spiropyrans has been synthesized and characterized. The introduction of binaphthyl can not only promote the solid-state luminescence but also achieve the interesting chiroptical switching properties for the potential applications in chiral recognition and circularly polarized luminescence. The single-crystal structures and density functional theory calculations reveal that the presence of strong electron-withdrawing nitro groups can promote photoswitch efficiency by stabilizing the electron-rich conjugated merocyanine with the lower electron cloud density and LUMO/HOMO levels. For charge transfer in excited states, π - π* transition would enhance emission, but n-π* transition and intramolecular charge transfer show the opposite effect. Therefore, these photochromic switches provide a novel paradigm in the design of multiple-responsive, chiral, and luminescent materials.
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