First‐Row d6 Metal Complex Enables Photon Upconversion and Initiates Blue Light‐Dependent Polymerization with Red Light DOI Creative Commons
Cui Wang, Christina Wegeberg, Oliver S. Wenger

et al.

Angewandte Chemie, Journal Year: 2023, Volume and Issue: 135(43)

Published: Sept. 8, 2023

Abstract Photosensitizers for sensitized triplet‐triplet annihilation upconversion (sTTA‐UC) often rely on precious heavy metals, whereas coordination complexes based abundant first‐row transition metals are less common. This is mainly because long‐lived triplet excited states more difficult to obtain 3d particularly when the d‐subshell only partially filled. Here, we report first example of sTTA‐UC a 6 metal photosensitizer yielding an performance competitive with metal‐based analogues. Using newly developed Cr 0 featuring equally good photophysical properties as Os II benchmark complex in combination acetylene‐decorated anthracene annihilator, red‐to‐blue achievable. The efficiency under optimized conditions 1.8 %, and excitation power density threshold reach strong limit 5.9 W/cm 2 . These factors, along high photostability, permit initiation acrylamide polymerization by red light, radiative energy transfer between delayed annihilator fluorescence blue light absorbing photo‐initiator. Our study provides proof‐of‐concept photon elusive analogues widely employed d photosensitizers, their application photochemical reactions triggered wavelengths close near‐infrared.

Language: Английский

First‐Row d6 Metal Complex Enables Photon Upconversion and Initiates Blue Light‐Dependent Polymerization with Red Light DOI Creative Commons
Cui Wang, Christina Wegeberg, Oliver S. Wenger

et al.

Angewandte Chemie, Journal Year: 2023, Volume and Issue: 135(43)

Published: Sept. 8, 2023

Abstract Photosensitizers for sensitized triplet‐triplet annihilation upconversion (sTTA‐UC) often rely on precious heavy metals, whereas coordination complexes based abundant first‐row transition metals are less common. This is mainly because long‐lived triplet excited states more difficult to obtain 3d particularly when the d‐subshell only partially filled. Here, we report first example of sTTA‐UC a 6 metal photosensitizer yielding an performance competitive with metal‐based analogues. Using newly developed Cr 0 featuring equally good photophysical properties as Os II benchmark complex in combination acetylene‐decorated anthracene annihilator, red‐to‐blue achievable. The efficiency under optimized conditions 1.8 %, and excitation power density threshold reach strong limit 5.9 W/cm 2 . These factors, along high photostability, permit initiation acrylamide polymerization by red light, radiative energy transfer between delayed annihilator fluorescence blue light absorbing photo‐initiator. Our study provides proof‐of‐concept photon elusive analogues widely employed d photosensitizers, their application photochemical reactions triggered wavelengths close near‐infrared.

Language: Английский

Citations

1