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Updated: Sep 6, 2026

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Published on: June 10, 2021
Bistable Switching of π-Conjugation in a Dithienylethene-Bridged Luminescent Trityl Diradicaloid
Xingmao Chang1, Sören Schlittenhardt2,3, Julia Zolg4
1Institute of Organic Chemistry and Center for Integrated Quantum Science and Technology, Ulm University, Ulm, Germany.
Abstract:
Robust external manipulation of spin communication in molecular frameworks is desirable for potential applications in quantum information science. Herein, we incorporate two types of dithienylethene (DTE) units into tris(2,4,6-trichlorophenyl)methyl (TTM)-based diradicaloids and report on the successful bistable switching of the optical and magnetic properties of the molecule. Visible-light irradiation of the open form generates up to 97% of the closed form, in which conjugation between the two radical centers leads to absorption over the entire visible range of the spectrum as well as a twofold increase of the singlet-triplet gap. These results establish TTM/DTE hybrids as persistent and multi-level responsive diradicaloids.
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