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- Pettersson-Rimgard, BelindaUppsala universitet,Fysikalisk kemi (author)
Proton-coupled energy transfer in molecular triads
- Article/chapterEnglish2022
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- American Association for the Advancement of Science (AAAS),2022
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- LIBRIS-ID:oai:DiVA.org:uu-483763
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-483763URI
- https://doi.org/10.1126/science.abq5173DOI
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- Language:English
- Summary in:English
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- We experimentally discovered and theoretically analyzed a photochemical mechanism, which we term proton-coupled energy transfer (PCEnT). A series of anthracene-phenol-pyridine triads formed a local excited anthracene state after light excitation at a wavelength of similar to 400 nanometers (nm), which led to fluorescence around 550 nm from the phenol-pyridine unit. Direct excitation of phenolpyridine would have required similar to 330-nm light, but the coupled proton transfer within the phenolpyridine unit lowered its excited-state energy so that it could accept excitation energy from anthracene. Singlet-singlet energy transfer thus occurred despite the lack of spectral overlap between the anthracene fluorescence and the phenol-pyridine absorption. Moreover, theoretical calculations indicated negligible charge transfer between the anthracene and phenol-pyridine units. We construe PCEnT as an elementary reaction of possible relevance to biological systems and future photonic devices.
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- Tao, ZhenYale Univ, Dept Chem, New Haven, CT 06520 USA.;Univ Penn, Dept Chem, Philadelphia, PA 19104 USA. (author)
- Parada, Giovanny A.Yale Univ, Dept Chem, New Haven, CT 06520 USA.;Coll New Jersey, Dept Chem, Ewing, NJ 08628 USA. (author)
- Cotter, Laura F.Yale Univ, Dept Chem, New Haven, CT 06520 USA. (author)
- Hammes-Schiffer, SharonYale Univ, Dept Chem, New Haven, CT 06520 USA. (author)
- Mayer, James M.Yale Univ, Dept Chem, New Haven, CT 06520 USA. (author)
- Hammarström, Leif,1964-Uppsala universitet,Fysikalisk kemi(Swepub:uu)leifhamm (author)
- Uppsala universitetFysikalisk kemi (creator_code:org_t)
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- In:Science: American Association for the Advancement of Science (AAAS)377:6607, s. 742-7460036-80751095-9203
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