Authors:	Rocker, Johannes Dresel, Johannes A. Krieger, Leonie A. Eckhardt, Paul Ortuño, Ana M. Kitzmann, Winald R. Clever, Guido H. Heinze, Katja Opatz, Till
Title:	Substitution effects on the photophysical and photoredox properties of tetraaza[7]helicenes
Online publication date:	12-Sep-2023
Year of first publication:	2023
Language:	english
Abstract:	A series of substituted derivatives of tetraaza[7]helicenes were synthesized and the influence of the substitution on their photophysical and photoredox-catalytic properties was studied. The combination of their high fluorescence quantum yields of up to 0.65 and their circularly polarized luminescence (CPL) activity results in CPL brightness values (BCPL) that are among the highest recorded for [7]helicenes so far. A sulfonylation/hetarylation reaction using cyanopyridines as substrates for photoinduced electron transfer (PET) from the excited helicenes was conducted to test for viability in photoredox catalysis. DFT calculations predict the introduction of electron withdrawing substituents to yield more oxidizing catalysts.
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-9522
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Chemistry - a European journal 29 48
Pages or article number:	e202301244
Publisher:	Wiley-VCH
Publisher place:	Weinheim
Issue date:	2023
ISSN:	1521-3765
Publisher DOI:	10.1002/chem.202301244
Appears in collections:	DFG-491381577-H