Expanding excitation wavelengths for azobenzene photoswitching into the near-infrared rangeviaendothermic triplet energy transfer
Isokuortti, Jussi; Kuntze, Kim; Virkki, Matti; Ahmed, Zafar; Vuorimaa-Laukkanen, Elina; Filatov, Mikhail A.; Turshatov, Andrey; Laaksonen, Timo; Priimägi, Arri; Durandin, Nikita A. (2021)
Isokuortti, Jussi
Kuntze, Kim
Virkki, Matti
Ahmed, Zafar
Vuorimaa-Laukkanen, Elina
Filatov, Mikhail A.
Turshatov, Andrey
Laaksonen, Timo
Priimägi, Arri
Durandin, Nikita A.
2021
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202106296103
https://urn.fi/URN:NBN:fi:tuni-202106296103
Kuvaus
Peer reviewed
Tiivistelmä
Developing azobenzene photoswitches capable of selective and efficient photoisomerization by long-wavelength excitation is an enduring challenge. Herein, rapid isomerization from theZ- toE-state of twoortho-functionalized bistable azobenzenes with near-unity photoconversion efficiency was driven by triplet energy transfer upon red and near-infrared (up to 770 nm) excitation of porphyrin photosensitizers in catalytic micromolar concentrations. We show that the process of triplet-sensitized isomerization is efficient even when the sensitizer triplet energy is substantially lower (>200 meV) than that of the azobenzene used. This makes the approach applicable for a wide variety of sensitizer-azobenzene combinations and enables the expansion of excitation wavelengths into the near-infrared spectral range. Therefore, indirect excitationviaendothermic triplet energy transfer provides efficient and precise means for photoswitching upon 770 nm near-infared light illumination with no chemical modification of the azobenzene chromophore, a desirable feature in photocontrollable biomaterials.
Kokoelmat
- TUNICRIS-julkaisut [16726]