Photochemical Spin‐State Switching of an All‐Organic Molecular System with Visible Light
Abstract
Abstract 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.
Article Details
Authors (7)
Joël Schlecht
Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, Freiburg 79104, Germany
Thomas Lohmiller
Philipp Thielert
Institute of Physical Chemistry, University of Freiburg, Albertstraße 21, 79104 Freiburg, Germany
Clara Douglas
Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, Freiburg 79104, Germany
Malte Gather
Department of Chemistry and Biochemistry University of Cologne Greinstrasse 4 50939 Cologne Germany
Sabine Richert
Institute of Physical Chemistry, University of Freiburg, Albertstraße 21, 79104 Freiburg, Germany
Oliver Dumele
Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, Freiburg 79104, Germany