Universität zu Köln

Schlecht, Joël ORCID: 0009-0000-2187-7985, Lohmiller, Thomas ORCID: 0000-0003-0373-1506, Thielert, Philipp ORCID: 0009-0000-9364-7951, Douglas, Clara ORCID: 0000-0002-9717-9777, Gather, Malte ORCID: 0000-0002-4857-5562, Richert, Sabine ORCID: 0000-0002-2990-974X and Dumele, Oliver ORCID: 0000-0002-3277-6570 (2025). Photochemical Spin‐State Switching of an All‐Organic Molecular System with Visible Light. Angewandte Chemie International Edition, 64 (46). pp. 1-6. Wiley. ISSN 1433-7851

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Abstract

[Artikel-Nr.: e202515144] Controlling the spin state of a molecule using the spatiotemporal properties of visible light is of interest for spintronic devices in information technology or (bio)medical applications. We, herein, report an all‐organic visible light‐induced photochromic system than can switch from a diamagnetic (singlet) to a paramagnetic (triplet) state. This is realized by precisely tuning orbital symmetry and internal molecular strain in a [5]helicene scaffold substituted with an indanedione π‐acceptor. Irradiation with visible light at cryogenic temperatures gives a kinetically meta‐stable paramagnetic diradical state with a solvent‐dependent ground‐state multiplicity (triplet or singlet), which can be thermally switched back to its initial diamagnetic state.

Item Type:	Article
Creators:	Creators Email ORCID ORCID Put Code Schlecht, Joël UNSPECIFIED https://orcid.org/0009-0000-2187-7985 UNSPECIFIED Lohmiller, Thomas UNSPECIFIED https://orcid.org/0000-0003-0373-1506 UNSPECIFIED Thielert, Philipp UNSPECIFIED https://orcid.org/0009-0000-9364-7951 UNSPECIFIED Douglas, Clara UNSPECIFIED https://orcid.org/0000-0002-9717-9777 UNSPECIFIED Gather, Malte UNSPECIFIED https://orcid.org/0000-0002-4857-5562 UNSPECIFIED Richert, Sabine UNSPECIFIED https://orcid.org/0000-0002-2990-974X UNSPECIFIED Dumele, Oliver UNSPECIFIED https://orcid.org/0000-0002-3277-6570 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-802106
Identification Number:	10.1002/anie.202515144
Journal or Publication Title:	Angewandte Chemie International Edition
Volume:	64
Number:	46
Page Range:	pp. 1-6
Number of Pages:	6
Date:	10 November 2025
Publisher:	Wiley
ISSN:	1433-7851
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Biochemistry
Subjects:	Chemistry and allied sciences Life sciences
Uncontrolled Keywords:	Keywords Language Diradical ; Electrochemistry ; EPR spectroscopy ; Photomagnet ; Photoswitch English
['eprint_fieldname_oa_funders' not defined]:	Publikationsfonds UzK
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/80210