🎓 [THESIS DEFENSE] – Hrudya Pariyacheri Padikkal will defend her PhD thesis:
🔬 “Chalcogen bonding interactions in charge-transfer complexes and salts of selenium-rich donors”
📅 Tuesday 17 November 2026 at 9:30 – ISCR – University of Rennes – Amphi Grandjean This thesis is funded by EUR LUMOMAT
This thesis is supervised by Dr. Marc FOURMIGUE – CNRS / Rennes University / ISCR and Dr. Ie-Rang JEON – CNRS/ University of Bordeaux / CRPP
Examining Committee :
➖ Prof. Piétrick HUDHOMME – MOLTECH-Anjou – Université d’Angers – Reviewer
➖ Prof. Enrique ESPINOSA – Université de Lorraine – Reviewer
➖ Dr. Flavia POP – CNRS/Université d’Anger – Examiner
➖ Dr. Fabrice POINTILLART – CNRS/Université de Rennes – Examiner
➖ Dr. Olivier JEANNIN, Research Engineer, Université de Rennes/ISCR – Invited Member
📄 [Abstract] Redox-active electron-rich molecules have raised a strong interest for their promising applications in organic electronics. In addition to their conducting properties, introducing paramagnetic metal complexes like FeCl4– or FeBr4– can extend their functionalities. In this thesis, we take advantage of an intermolecular interaction called chalcogen bonding (ChB), to induce such magnetic interactions. We focus on selenium-based organic electron donors different from tetraselenafulvalenes, and characterized, in their cation radical state, by a strong spin density in positions readily available for interactions with magnetic anions. Moreover, these molecules in their radical state develop around the Se atoms, electron deficient regions called σ-holes, able to interact through ChB with counter ions. This thesis focuses on the activation of σ-holes in the cation radical salts and charge-transfer omplexes (with TCNQFn, n = 0, 1, 2, 4 as electron acceptors) of selenium-rich electron donors such as 1,2 diselenoles (naphthalene _peri-_diselenides and tetraselenides), and selenanthrenes. It highlights the potential of σ-hole engineering as a bridge between molecular, electronic structure and material properties.
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