Authors:	Sittel, Steven Sell, Arne Christian Hofmann, Kamil Wiedemann, Christina Nau, Jan Philipp Kerzig, Christoph Manolikakes, Georg Heinze, Katja
Title:	Visible-light induced fixation of SO2 into organic molecules with polypyridine chromium(III) complexes
Online publication date:	7-Jun-2023
Year of first publication:	2023
Language:	english
Abstract:	Incorporation of sulfur dioxide into organic compounds is achieved by a photocatalytic approach using sensitizers made from earth-abundant chromium(III) ions and visible light leading to sulfones and sulfonamides. We employed three different chromium(III) sensitizers [Cr(ddpd)2]3+, [Cr(bpmp)2]3+ and [Cr(tpe)2]3+ with long excited state lifetimes and different ground and excited state redox potentials as well as varying stability under the reaction conditions (ddpd=N,N’-dimethyl-N,N’-dipyridin-2-yl-pyridine-2,6-diamine; bpmp=2,6-bis(2-pyridylmethyl)pyridine; tpe=1,1,1-tris(pyrid-2-yl)ethane). Key reaction steps of the catalytic cycles are identified by electrochemical, luminescence quenching, photolysis, laser flash photolysis and catalytic experiments delivering a detailed picture of the challenges in these transformations. The reactivity of the reduced chromium complex was identified as a key property to explain the reaction outcomes. Initial cage escape yield determinations with [Cr(tpe)2]3+ revealed that desired photoreactions occur with unusually high quantum efficiencies, whereas side reactions are almost unproductive.
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-9153
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY-NC
Information on rights of use:	https://creativecommons.org/licenses/by-nc/4.0/
Journal:	ChemCatChem 15 6
Pages or article number:	e202201562
Publisher:	Wiley-VCH
Publisher place:	Weinheim
Issue date:	2023
ISSN:	1867-3899
Publisher DOI:	10.1002/cctc.202201562
Appears in collections:	DFG-491381577-H