2015年6月
結晶構造解析による光誘起結晶-融解相転移現象の解明
日本結晶学会誌
- 巻
- 57
- 号
- 3
- 開始ページ
- 178
- 終了ページ
- 183
- 記述言語
- 日本語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.5940/jcrsj.57.178
- 出版者・発行元
- The Crystallographic Society of Japan
The organic crystal consisted of a methylene-bridged azobenzene dimer possessing long-chain alkoxy groups melts by UV light irradiation. This characteristic phase transition is named as the photoinduced crystal-melt transition and starts from the trans-cis photoisomerization of azobenzene moieties at a solid state. Herein, elucidation of detailed mechanism of the photoinduced crystal-melt transition in the crystal of the above target compound by single crystal X-ray structure analysis is described. In this crystal structure, azobenzene moieties are aligned via intermolecular π…π interactions for constructing three-dimensional periodic structure as a crystal. On the other hand, long-chain alkoxy groups are disturbed due to their thermal motion. This thermal motion of them mitigates the mechanical stress from geometrical change accompanying with trans-cis photoisomerization of azobenzene moieties and leads formation of an overall isotropic melt phase with sacrificing π…π interactions in the crystalline phase. Visualizing these structural features playing a role for photoinduced crystal-melt transition rationalizes phase transition induced by solid-state photoreaction with proposing a phase diagram.
- リンク情報
- ID情報
-
- DOI : 10.5940/jcrsj.57.178
- ISSN : 0369-4585
- CiNii Articles ID : 130005085903
- CiNii Books ID : AN00188364