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Louis Ancel Price of the French Physical Society

                                                              


Eric Collet has been awarded the Louis Ancel price of the French Physical Society (SFP) in 2017 for his achievements in condensed matter physics. At this occasion, he will deliver a plenary talk during the JMC 2018 meeting in Grenoble.


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Fast & Ferrous!

Electronic and structural dynamics during the switching of the photomagnetic complex [Fe(L222N5)(CN)2].

 

The [Fe(L222N5)(CN)2] compound is a photomagnetic FeII (ferrous) based coordination compound, which undergoes light-induced excited spin-state trapping (LIESST). The low spin state is hexacoordinated and the high spin state heptacoordinated. This system also serves as complex for the design of trinuclear or one-dimensional compounds made of other types of bricks with diverse coordinated metals. Here we study its ultrafast spin-state photoswitching dynamics, by combining femtosecond optical spectroscopy and femtosecond X-ray absorption measurements at the XPP station of the X-ray free-electron laser LCLS. DFT and TD-DFT calculations are used to interpret experimental findings. These studies performed in the solution phase show that LIESST in [Fe(L222N5)(CN)2] occurs on the 100 fs timescale under different types of photoexcitation. In addition, we observe coherent oscillations resulting from the structural dynamics accompanying LIESST, which were recently evidenced in more conventional octahedral FeIIN6 systems.

S. Zerdane, E. Collet,* X. Dong, S. F. Matar, H. F. Wang, C. Desplanches, G. Chastanet, M. Chollet, J. M. Glownia, H.T. Lemke, M. Lorenc, M. Cammarata,*
Electronic and structural dynamics during the switching of the photomagnetic complex [Fe(L222N5)(CN)2]
      Chemistry A European Journal doi 10.1002/chem.201704746 (2017)

This study is in direct relation with our paper publihed in Nature Communication: