The Magnetism Network of the Greater Region won the 2018 interregional research prize for its collaborative fundamental research and R&D activities. Congratulations to the coordinator of this organizion, Thomas Hauet. Let’s wish the same success to the French and European Magnetometry Network!
This work demonstrates the possibility of modulating the spin state of the FeII sites and subsequently the magnetic properties of a [2×2] FeII grid-like complex by variation of the degree of deprotonation of the hydrazine-based N-H sites of the ligand in the complex. Evidence has been provided, both in the solid state and in solution, towards understanding the strong influence of the spin-crossover process on the pKas of the grid ligands, which exhibit a unique deprotonation pattern. The present study provides a demonstration of the effect of spin state switching of a chemical property, here on ligand pKa in a metallosupramolecular grid.
Sébastien Dhers, Abhishake Mondal, David Aguilà, Juan Ramírez, Sergi Vela, Pierre Dechambenoit, Mathieu Rouzières, Jonathan R. Nitschke, Rodolphe Clérac & Jean-Marie Lehn. Spin State Chemistry: Modulation of Ligand pKa by Spin State Switching in a [2×2] Iron(II) Grid-Type Complex J. Am. Chem. Soc. 2018, 140 (26), pp 8218–8227 DOI : 10.1021/jacs.8b03735
Incorporating functional molecules into sensor devices is an emerging area in molecular electronics that aims at exploiting the sensitivity of different molecules to their environment and turning it into an electrical signal. Among the emergent and integrated sensors, microelectromechanical systems (MEMS) are promising for their extreme sensitivity to mechanical events. However, to bring new functions to these devices, the functionalization of their surface with molecules is required. Herein, we present original electronic devices made of an organic microelectromechanical resonator functionalized with switchable magnetic molecules. The change of their mechanical properties and geometry induced by the switching of their magnetic state at a molecular level alters the device’s dynamical behavior, resulting in a change of the resonance frequency. We demonstrate that these devices can be operated to sense light or thermal excitation. Moreover, thanks to the collective interaction of the switchable molecules, the device behaves as a non-volatile memory. Our results open up broad prospects of new flexible photo- and thermo-active hybrid devices for molecule-based data storage and sensors.
Matias Urdampilleta, Cedric Ayela,
Pierre-Henri Ducrot, Daniel Rosario-Amorin, Abhishake Mondal, Mathieu
Rouzières, Pierre Dechambenoit, Corine Mathonière, Fabrice Mathieu, Isabelle
Dufour et Rodolphe Clérac Molecule-based microelectromechanical sensors Scientific Reports – Mai 2018 DOI: 10.1038/s41598-018-26076-2
Depuis de nombreuses années, les chercheurs rêvent d’utiliser des molécules bistables comme unités élémentaires pour le stockage binaire de bits d’information (0 ou 1), et ainsi accéder à des mémoires informatiques plus légères et plus petites. Une équipe franco-américaine composée de chercheurs de l’Université de Berkeley, du Centre de Recherche Paul Pascal (CNRS) et de l’Institut de Chimie de la Matière Condensée de Bordeaux (CNRS) vient de réaliser une molécule non plus bistable mais tristable, étendant ainsi les valeurs possibles des bits à 0, +1 et -1. Ces résultats parus dans le Journal of the American Chemical Society ouvrent des perspectives pour le stockage ternaire de l’information qui permettrait d’envisager des mémoires encore plus performantes.
A new multi-switchable complex has been
rationally assembled using a redox-active and strongly complexing
bridging ligand. By simple oxidation/reduction, its magnetic properties
can be tuned from a spin-crossover complex, to a single-molecule magnet
with an S = 5/2 spin ground state (when once reduced) and to
diamagnetic species when twice reduced. This work illustrates
experimentally and theoretically how successive redox processes can
increase the spin delocalization, and thus promote a dramatic
enhancement of the intramolecular magnetic coupling through a bridging
ligand, not only in its radical form. This general synthetic approach
should help for the intentional design of new high-spin complexes and
SMMs, but it could also be extended to systems with higher nuclearities
and dimension- alities, for example to obtain high-temperature molecule-
Xiaozhou Ma, Elizaveta A. Suturina, Siddhartha De, Philippe Négrier, Mathieu Rouzières, Rodolphe Clérac et Pierre Dechambenoit Redox-Active Bridging Ligand as a Tool to Promote Spin Delocalization, High Spin Complexes and Magnetic Multi-Switchability Angewandte Chemie International Edition – Avril 2018 DOI: 10.1002/anie.201803842
CNRS engineer for characterization & instrumental development (magnetometry)
Place and date of Birth: Talence (Gironde, France) 11 Avril 1980 Institutional address: Centre de Recherche Paul Pascal CRPP – CNRS UMR5031 Research team M3 115, avenue du Dr. A. Schweitzer 33600 Pessac, France Phone: +33 5 56 84 56 24 Fax: +33 5 56 84 56 00 Email: firstname.lastname@example.org
Academic education and professional positions
Assistant Ingénieur en Science des matériaux et Caractérisation, CNRS CRPP, Team M3
Assistant Ingénieur en Instrumentation et Techniques expérimentales, CNRS CRPP, Team M3
2004 – 20010
Assistant Ingénieur en Instrumentation, Synchrotron SOLEIL, Ligne de lumière de spectroscopie InfraRouge et TeraHertz AILES
2001 – 2002
Analyste programmeur (C++, WinDev), European Data
DUT Mesures Physiques, Université de Bordeaux
Most significant publications
. P. Perlepe, I. Oyarzabal, A. Mailman, M. Yquel, M. Platunov, I. Dovgaliuk, M. Rouzières, P. Négrier, D. Mondieig, E. A. Suturina, M.A. Dourges, S. Bonhommeau, R. A. Musgrave, K. S. Pedersen, D. Chernyshov, F. Wilhelm, A. Rogalev, C. Mathonière, R. Clérac, “Metal-organic magnets with large coercivity and ordering temperatures up to 242°C”, Science, Vol. 370, Issue 6516, pp. 587-592, (2020) – 10.1126/science.abb3861 – Abstract – Reprint – Full text
. Y.S. Ye, X.Q. Chen, Y. De Cai, B. Fei, P. Dechambenoit, M. Rouzières, C. Mathonière, R. Clérac and X. Bao “Slow Dynamics of the Spin-Crossover Process in an Apparent High-Spin Mononuclear FeII Complex”, Angew. Chem. Int. Ed., 58, 18888-18891, (2019) – 10.1002/anie.201911538.
. D. Sadhukhan, P. Ghosh, C. J. Gómez-García, M. Rouzieres, Co(II)-Hydrazone Schiff Base Single Ion Magnet Exhibiting Field Induced Slow Relaxation Dynamics, Magnetochemistry, 4, 56 (2018) –10.3390/magnetochemistry4040056
. K. S. Pedersen, P. Perlepe, M. L. Aubrey, D. N. Woodruff, S.E. Reyes-Lillo, A. Reinholdt, L. Voigt, Z. Li, K. Borup, M. Rouzières, D. Samohvalov, F. Wilhelm, A. Rogalev, J. B. Neaton, J. R. Long, R. Clérac, “Formation of the layered conductive magnet CrCl2(pyrazine)2 through redox-active coordination chemistry”, Nature Chemistry, 10, 1056-1061 (2018) – 0.1038/s41557-018-0107-7
Most significant instrumental developments
Creation of softwares to treat and analize magnetic data (MagSuite)
2017 – 2020
Conception of a four points inline probe for conductivity measurements for Quantum Design PPMS systems, compatible with air sensitive pellet, and a controlled environment from 400 to 1.9 K, and up to 9T
2015 – 2016
Improvement of the control & acquisition software of a prototype for visible reflectance measurements, with a controlled environment from 270 to 10 K, and with an adjustable irradiation (365 – 1050 nm)
2013 – 2015
Integration of helium recondenser on Quantum Design systems (MPMS XL, PPMS)
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