Cyclodextrin-Isolated Alkynylpyrenes as UV-Stable and Blue-Light-Emitting Molecules Even in Condensed States

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• 作者：Masahiko Inouye ; Atsushi Yoshizawa ; Mari Shibata ; Yuki Yonenaga ; Kazuhisa Fujimoto ; Takuma Sakata ; Shinya Matsumoto ; Motoo Shiro
• 刊名：Organic Letters
• 出版年：2016
• 出版时间：May 6, 2016
• 年：2016
• 卷：18
• 期：9
• 页码：1960-1963
• 全文大小：301K
• 年卷期：0
• ISSN：1523-7052

文摘

Encapsulation of highly emissive alkynylpyrenes with permethylated α-cyclodextrin (PM-α-CD) followed by capping reaction yielded alkynylpyrene-based [3]rotaxanes. The [3]rotaxane emitted only blue light of monomeric pyrene under various circumstances such as lipophilic, hydrophilic, and even condensed states and exhibited extremely high stability for UV irradiation. These properties would result because PM-α-CD, like bulletproof glass, protected the alkynylpyrene core from the attack of another excited alkynylpyrene and singlet oxygen generated by the energy transfer from the excited alkynylpyrene.