VOCの気体分子は固体にどう取り込まれるのか――分子性結晶の大きさによって相転移・再結晶・潮解という異なる挙動を示すことを実証――

2026-10-01 東京大学

分子性結晶が蒸気のクロロホルム分子を取り込みながら相転移・再結晶・潮解が起こる

＜関連情報＞

• https://www.iis.u-tokyo.ac.jp/ja/news/5157/
• https://onlinelibrary.wiley.com/doi/10.1002/smll.75743

有機蒸気によって誘発される分子結晶の微視的挙動 Organic Vapor-Induced Microscopic Behaviors in Molecular Crystals

Xiao Ma, Kyoko Enomoto, Yuki Matsuda, Masaaki Abe, Kazuyuki Ishii
Small  Published: 30 September 2026
DOI:https://doi.org/10.1002/smll.75743

ABSTRACT

Understanding and controlling the phase transitions of molecular crystals remain one of the most challenging, important issues in molecular science and technology. In this study, confocal laser microscopy and single-crystal X-ray diffraction were used together to observe an organic vapor-induced single-crystal-to-single-crystal phase transition of fac-[Re(CO)₃Br(ppt)] (ppt = 2-pyridyl-4-phenylthiazole) crystals. The inclusion of CHCl₃ vapor molecules induced dynamic, microscopic, cooperative single-crystal-to-single-crystal phase transition processes in > 50 µm-sized non-solvated crystals. CHCl₃ vapor exposure caused recrystallization of 2–10 µm-sized crystals, whereas CHCl₃ vapor-induced deliquescence was observed for ≤2 µm-sized crystals. These findings deepen scientific understanding of solid-state phase transitions at the molecular level.