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Supramolecular Crowding Can Avoid Oxygen Quenching of Photon Upconversion in Water
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- Hironori Kouno
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS) Kyushu University 744 Moto-oka, Nishi-ku Fukuoka 819-0395 Japan
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- Yoichi Sasaki
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS) Kyushu University 744 Moto-oka, Nishi-ku Fukuoka 819-0395 Japan
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- Nobuhiro Yanai
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS) Kyushu University 744 Moto-oka, Nishi-ku Fukuoka 819-0395 Japan
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- Nobuo Kimizuka
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS) Kyushu University 744 Moto-oka, Nishi-ku Fukuoka 819-0395 Japan
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Description
<jats:title>Abstract</jats:title><jats:p>A common challenge in chemistry that deals with photoexcited states is to avoid oxygen quenching. This is crucial for hot research fields such as photon upconversion (UC), in which oxygen‐sensitive triplet excited states play pivotal roles. However, methods to avoid oxygen quenching in aqueous media are far more limited despite eagerly anticipated catalytic and biological applications. This work introduces a simple strategy to achieve air‐stable triplet–triplet annihilation (TTA)‐based UC in water, namely, supramolecular crowding. Amphiphilic cationic acceptor molecules and anions with long alkyl chains co‐assemble in water in which hydrophobic donor molecules are molecularly dispersed. Despite the common notion that oxygen molecules diffuse readily across hydrophobic domains in water, more than 80 % of the TTA‐UC emission of the obtained hydrophobic co‐assemblies is maintained in air‐saturated water. This work demonstrates the new promising potential of supramolecular chemistry for photophysical and photochemical functions with oxygen‐sensitive species.</jats:p>
Journal
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- Chemistry – A European Journal
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Chemistry – A European Journal 25 (24), 6124-6130, 2019-03-20
Wiley
