2025-08-28 京都大学
＜関連情報＞
- https://www.kyoto-u.ac.jp/ja/research-news/2025-08-28-0
- https://www.kyoto-u.ac.jp/sites/default/files/2025-08/2508_JACS_Okazaki_relj%20web-260e3bf095c8caffe9f5f45c004f2a54.pdf
- https://pubs.acs.org/doi/10.1021/jacs.5c05168
非対称環歪みによるアモルファスシロキサンネットワークにおけるキラル光学信号増幅 Chiroptical Signal Amplification in Amorphous Siloxane Network by Asymmetric Ring Distortion
Yutaka Okazaki,Thierry Buffeteau,Naoya Ryu,Kyohei Yoshida,Ju-Yeon Jo,Kan Hachiya,Takashi Sagawa,and Reiko Oda
Journal of the American Chemical Society Published: July 22, 2025
DOI:https://doi.org/10.1021/jacs.5c05168
Abstract
Understanding the polymorphs and amorphous structures of silicon oxide is an essential issue not only for fundamental science but also for energy and environmental science. In particular, the amplification mechanism of chiroptical signals in amorphous silicon oxide has drawn significant attention. Here, we explore how the chiroptical signal can be amplified in amorphous silicon oxide (silica) having nanoscale helical structures. Our findings reveal that the observed vibrational circular dichroism (VCD) signals originate from the formation of symmetry-broken siloxane ring structures. Furthermore, we demonstrate that the amplification of siloxane VCD signals is driven by an enthalpy-driven asymmetric ring distortion during volumetric shrinkage.
