偽トラクサン結晶の可逆レーザー誘発曲折
Shao-Chi Cheng1, Kai-Jen Chen1, Yuji Suzaki2
1Department of Chemical Engineering, National Tsing Hua University , 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan.
Journal of the American Chemical Society
|December 26, 2017
まとめ
この研究では,アゾベンゼン群を持つ偽ロタキサン結晶は,光照射時に迅速で可逆的な曲げを示しています. この光反応は分子構造によって調節可能であり,光で活性化される材料の可能性を提供します.
科学分野:
- 超分子化学
- 材料科学
- 写真化学
背景:
- 偽ロタキサンは,分子機械における潜在的な応用を持つ超分子組成物である.
- アゾベンゼンとフェロセニル群は,光反応性分子が知られている.
研究 の 目的:
- アゾベンゼンとフェロセニル単位を組み込んだシドオロタキサン結晶のダイナミックな光反応を調査する.
- 分子構造と観測された光誘発曲折の振る舞いを相関させる.
主な方法:
- 偽ロタキサン結晶の構造特性を決定するために,X線結晶学を用いた.
- 特定の波長 (360 nm と 445 nm) のレーザー照射を交互に用いて光反応を誘導し観察した.
主要な成果:
- メチラゾーベンゼン群のプセドロタキサン結晶は,有意な回転 (17°と38°) を示した.
- 繰り返し照射すると,逆方向で20〜30°の可逆曲折を誘導し,衰退は起こらなかった.
- 非置換の偽ロタキサンは,強いπ-π相互作用により,最小の屈曲 (2°) を示した.
結論:
- プセドロタキサン結晶は,調節可能で,迅速で,可逆的な光反応性曲折能力を有する.
- アゾベンゼン置換物質とπ-π相互作用を含む分子構造は,光誘発曲線の効率と方向を決定する.
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