CE07 - Chimie moléculaire

Light-induced Electronic Control of MAgnetic molecules – LECMA

Submission summary

The objective of the proposal is to develop a molecular design that enables a Light-induced Electronic Control of MAgnetic molecules (LECMA). This project is based on the concept of using light to trigger a change between two electronic states leading to bistability at room temperature. The molecules will consist of organic photo-active parts linked to Fe(II) spin crossover (SCO) complexes. These magnetic complexes can reversibly switch from a diamagnetic low spin state (LS, S=0) to a paramagnetic high spin state (HS, S=2). The concept developed in this project consists in using light to induce a dissymmetric electronic distribution on the Fe(II) ligands that would trigger the spin transition process. To date, it still remains a challenge to reversibly and synergistically manipulate the SCO process by light irradiation in the solid state at room temperature. The thermal bistability in spin crossover systems is not due to single molecules but emerges from long range elastic interactions among the molecules within the molecular materials. To aim at a direct electric control of the spin state, we will use organic photo-switches as ligands in SCO complexes, providing a change of the electronic density distribution in the coordination sphere of the magnetic metallic ion, thus triggering the electronic switch. In addition, to increase and modulate the electronic delocalizations, we will play on ligand polarizability by introducing donor and acceptor moieties on the Fe(II) ligands. Thus, the molecular systems developed in this project open the routes to information storage at the single molecule level at room temperature, and will have high potential in molecular electronics for the development of many applications (sensors, information storage, electronic devices).

Project coordination

Nathalie Bridonneau (Université Paris-Saclay)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.


ICMMO Université Paris-Saclay

Help of the ANR 195,444 euros
Beginning and duration of the scientific project: January 2023 - 42 Months

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