In The Conversation, we have been invited to discuss with the general audience about our metal-organic magnets reported in Science last October.

The 20 minutes website has also communicated on our article in The Conversation.

Des aimants légers et performants grâce à la chimie moléculaire

Les aimants sont des matériaux présents dans de très nombreux objets de nos vies quotidiennes: ce sont par exemple des constituants essentiels de nos ordinateurs, des microphones, des moteurs électriques d’appareils ménagers ou même de turbines d’éoliennes. Pour certaines applications, comme dans les smartphones ou les satellites, ces aimants doivent être à la fois légers et de petite taille.

Les aimants sont généralement des solides constitués de métaux purs, d’oxydes métalliques ou d’alliages métalliques. Malgré leur utilisation intensive et leur énorme succès dans les applications technologiques, la production d’aimants pose des problèmes environnementaux et économiques. Certains éléments chimiques nécessaires à leur élaboration, comme les terres rares présents dans les aimants les plus puissants connus aujourd’hui, sont inégalement répartis sur la planète ou difficiles à isoler. De plus, la fabrication des aimants nécessite souvent des procédés réalisés à haute température qui consomment beaucoup d’énergie.

Afin de remédier à ces problèmes, les scientifiques essayent depuis environ 3 décennies de créer un nouveau type d’aimants en assemblant des molécules pour créer un édifice aux propriétés désirées. L’élaboration de tels assemblages moléculaires se fait à température ambiante, ce qui rend leur fabrication facile à reproduire et peu coûteuse. Cependant, il y a encore quelques mois, les performances des aimants moléculaires (température de fonctionnement, capacité d’attraction…) étaient encore très loin de celles des aimants conventionnels.

Récemment, dans une étude publiée dans Sciencenous avons démontré qu’il est désormais possible d’obtenir des aimants moléculaires avec des caractéristiques comparables aux aimants conventionnels….

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Rodolphe Clérac received the 2021 Silver Medal from the CNRS.

Rodolphe Clérac, Research Director at the Centre de Recherche Paul and head of the “Molecular Materials & Magnetism” team, received the 2021 Silver Medal from the CNRS. In 2000, he joined the IUT of Bordeaux 1 and the Centre de Recherche Paul Pascal, as an associate professor. He began his career focusing on the physical properties of fullerene salts and new molecular materials. In 2001, he brought together a new research team around molecular magnetic materials and introduced coordination chemistry at the Centre de Recherche Paul Pascal.

Photo © Philippe Labeguerie

In 2002, he discovered the first single-chain magnets, which opened up a new research field in molecular magnetism. His work then focused on these new one-dimensional magnets, the organization of molecule-magnets into coordination networks and he widened his researches towards bi- and tri-stable molecule-based systems with intramolecular electron transfer or spin conversion in solution, in the solid state or liquid crystal phases. In 2008, he joined the CNRS becoming a full-time researcher, and then in 2013, he was promoted to research director. In 2020, he developed a new post-synthetic approach and obtain the first molecular magnets operating up to 242°C with a high coercivity at room temperature. This synthetic strategy offers broad prospects for the preparation of a new generation of lightweight magnets at high temperature. His projects are currently directed towards the synthesis of new multifunctional molecule-based materials containing redox-active sites in order to obtain high-performance magnets also possessing high electrical conduction, photoactivity or porosity allowing selective gas absorption.

Rodolphe Clérac is author and co-author of over 500 publications and has presented over 130 invited lectures. He was elected in 2019 to the European Academy of Sciences and in 2020 to the Academia Europaea. In 2014, he became a junior distinguished member of the Société Chimique de France and received various awards including in 2017 the France-Berkeley Fund Award, in 2014 the National Chinese Award for the “1000 Talents Program” and in 2009 the Young Researcher Award of the Division de Chimie Physique de la Société Chimique de France.

Contact: Rodolphe Clérac
Centre de Recherche Paul Pascal, UMR CNRS 5031
“Molecular Materials & Magnetism” team
115 Avenue du Dr. A. Schweitzer, 33600 Pessac, FRANCE
Phone: +33 (0) 5 56 84 56 50

They are talking about…

Substantial π-aromaticity in the anionic heavy-metal cluster [Th@Bi12]4−“, A.R. Eulenstein, Y.J. Franzke, N. Lichtenberger, R.J. Wilson, H. Lars Deubner, F. Kraus, R. Clérac, F. Weigend and S. Dehnen, Nature Chemistry, 13, 149-155, (2021) – 10.1038/s41557-020-00592-z – hal-03133022

See below different links, which discuss this work:

In English:

https://chemistrycommunity.nature.com/

https://www.chemistryworld.com

In German:

https://idw-online.de/

https://www.uni-marburg.de/

http://marburg.news/

https://www.juraforum.de/

Rasmus Tang Christiansen

Place and date of Birth:
Copenhagen (Denmark)
29th of July, 1994
Institutional address:
Institut Laue-Langevin (ILL)
71 avenue des Martyrs
CS 20156, 38042 GRENOBLE Cedex 9, France
Phone:   +33 4 76 20 79 67
Fax:         —
Email: christiansen@ill.fr

Education:

2021-2024: PhD student in Chemistry, Faculty of Science and Engineering, School of Natural Sciences, Department of Chemistry, Univeristy of Manchester, UK. Tentative title: “Double Exchange Spin Dynamics in Valence Delocalised Molecular Magnets”

2018-2020: Master’s degree in Physics, Faculty of Science, Niels Bohr Institute, University of Copenhagen

2014-2018: Bachelor in Physics, Faculty of Science, Niels Bohr Institute, University of Copenhagen

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