Monday 23 November, 14:30

November 2026

Monday 23
- 14:30 - 16:30

Campus de Beaulieu - ISCR - Bat. 10 B - Amphi Grandjean

Rennes

Ille-et-Vilaine

Bretagne

Louis Caussin PhD defense

Name: Louis Caussin PhD defense
Start: 2026-11-23T14:30:00+01:00
End: 2026-11-23T16:30:00+01:00
Location: Campus de Beaulieu - ISCR - Bat. 10 B - Amphi Grandjean

Photoswitchable radicals for the light control of single-molecule magnets

Monday 23 November, 14:30

Organometallics: Materials & Catalysis (OMC) team

Abstract
Single-chain magnets exhibit magnetic bistability at the molecular scale and hold promise for high-density information storage. Controlling them with light would provide an additional level of control. This work combines dithienylethene photochromic units, nitronyl-nitroxide radicals, and lanthanide(III) ions, with photoisomerization intended to modulate both magnetic exchange interactions and the ligand field around the metal.
Four dithienylethene–nitronyl-nitroxide diradicals and three monoradical analogs were synthesized and characterized. The most compact diradical, previously unreported, exhibits an antiferromagnetic exchange interaction multiplied by a factor of 100 upon ring closure—the strongest reported to date for this family—as well as the first ON/OFF photomodulation of the luminescence of a nitronyl-nitroxide radical.
The coordination of these ligands to lanthanide(III) ions led to the first complexes integrating dithienylethene–nitronyl-nitroxide units, in both open and closed forms. Their photochromic and magnetic properties were studied, particularly using torque magnetometry.
These results lay the foundation for the development of photocommutable single-chaine magnets based on radicals.

Jury
Jennifer Molloy, CNRS researcher, University Grenoble Alpes
Ie-Rang Jeon, CNRS researcher, University of Bordeaux
David Canevet, Professor, University of Angers
Mauro Perfetti, Professor, University of Florence
Lucie Norel, Professor, ISCR, University of Rennes / PhD Director
Kevin Bernot, Professor, INSA Rennes, ISCR, University of Rennes / PhD Co-Director

Contacts
Louis Caussin, Louis.caussin@univ-rennes.fr
Lucie Norel, lucie.norel@univ-rennes.fr
Kevin Bernot, kevin.bernot@univ-rennes.fr

November 2026

Monday 23
- 14:30 - 16:30

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About the location

Campus de Beaulieu - ISCR - Bat. 10 B - Amphi Grandjean

Rennes

Ille-et-Vilaine

Bretagne

UID

Licensor: Institut des Sciences Chimiques de Rennes - ISCR

Relayed by Rennes Métropole

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Updated on October 7, 2026

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