Authors:	Zähringer, Till J. B. Moghtader, Julian A. Bertrams, Maria-Sophie Roy, Bibhisan Uji, Masanori Yanai, Nobuhiro Kerzig, Christoph
Title:	Blue-to-UVB upconversion, solvent sensitization and challenging bond activation enabled by a benzene-based annihilator
Online publication date:	19-Feb-2024
Year of first publication:	2022
Language:	english
Abstract:	Several energy-demanding photoreactions require harsh UV light from inefficient light sources. The conversion of low-energy visible light to high-energy singlet states via triplet-triplet annihilation upconversion (TTA-UC) could offer a solution for driving such reactions under mild conditions. We present the first annihilator with an emission maximum in the UVB region that, combined with an organic sensitizer, is suitable for blue-to-UVB upconversion. The annihilator singlet was successfully employed as an energy donor in subsequent FRET activations of aliphatic carbonyls. This hitherto unreported UC-FRET reaction sequence was directly monitored using laser spectroscopy and applied to mechanistic irradiation experiments demonstrating the feasibility of Norrish chemistry. Our results provide clear evidence for a novel blue light-driven substrate or solvent activation strategy, which is important in the context of developing more sustainable light-to-chemical energy conversion systems.
DDC:	540 Chemie 540 Chemistry and allied sciences
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 09 Chemie, Pharmazie u. Geowissensch.
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-10103
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY-NC
Information on rights of use:	https://creativecommons.org/licenses/by-nc/4.0/
Journal:	Angewandte Chemie International Edition 62 8
Pages or article number:	e202215340
Publisher:	Wiley
Publisher place:	Weinheim
Issue date:	2022
Publisher DOI:	10.1002/anie.202215340
Relations:	is version of 10.25358/openscience-10098
Appears in collections:	DFG-491381577-H