Congratulations to Ryan Evenson (Harvard University) and Carmen Metzler (University of Puerto Rico), both recipients of a 2022-23 Chateaubriand Fellowship (http://chateaubriand-fellowship.org). They will spend 4 months in the M3 team working on magnetic materials.
Place and date of Birth: NC Institutional address: Centre de Recherche Paul Pascal CRPP – CNRS UMR5031 M3 research team 115, avenue du Dr. A. Schweitzer 33600 Pessac, France Phone: +33 5 56 84 56 56 Fax: +33 5 56 84 56 00 Email: hugo.marci-luciano@crpp.cnrs.fr
ADAGIO is an international fellowship programme aiming at attracting talented post-doc scientists to develop their 3 year projects.
DO YOU WANT TO GET ON BOARD? 1. Develop your own innovative scientific project 2. Select up to 3-research group 3. Choose one of our partner organization to add industrial skills 4. Submit your application!
During more than 7 minutes, this TV report shows the work of our team through different short videos and by interviewing Rodolphe Clérac. The main topics are coordination chemistry, our research work, the CNRS 2021 silver medal, the importance of fundamental research and research funding in France.
Ces pros qui nous inspirent : dans ce rendez-vous hebdomadaire, on découvre les coulisses du monde du travail en Nouvelle-Aquitaine, on comprend les problématiques des entreprises, leurs innovations, et leur agilité dans un monde en pleine mutation.
Les acènes sont des molécules linéaires composées de cycles de benzène fusionnés, dont l’extension améliore les performances électroniques, mais complique fortement la synthèse. Des scientifiques du CEMES (CNRS), de l’académie tchèque des sciences (République tchèque) et de l’université d’Hokkaido (Japon) ont obtenu le premier acène stable à neuf cycles benzéniques : le nonacène. Publiés dans la revue Nature Communications, ces travaux pourraient aboutir au développement de nouveaux composants électroniques.
Les acènes sont une famille d’hydrocarbures comprenant plusieurs benzènes fusionnés formant une chaîne linéaire. Ces molécules présentent des propriétés électroniques singulières, car plus ces acènes sont longs et plus leur comportement se rapproche de celui des semi-métaux. Or, comme il s’agit de molécules organiques, les acènes sont beaucoup plus faciles à fonctionnaliser et mettre en forme que les semiconducteurs inorganiques, ce qui permet de leur donner des propriétés supplémentaires et de les déposer sur davantage de surfaces différentes. Les chercheurs tentent donc de concevoir des acènes de plus en plus longs, mais l’ajout de nouveaux cycles benzéniques réduit très fortement la solubilité et la stabilité de la molécule. Si la fabrication du tétracène ou du pentacène, composés respectivement de quatre et cinq cycles de benzène, est bien connue, des doutes subsistaient quant à la possibilité d’aller au-delà de l’heptacène (sept cycles). Des chercheurs du Centre d’élaboration de matériaux et d’études structurales (CEMES, CNRS), de l’académie tchèque des sciences (République tchèque) et de l’université d’Hokkaido (Japon) ont obtenu pour la première fois un nonacène, soit un acène à neuf cycles. Il se présente sous la forme d’un solide noir, qui se conserve sous atmosphère inerte pendant des mois…
By coupling together a pair of lanthanide ions within the same compound, researchers have created what they believe are the most magnetic molecules ever made (Science 2022, DOI: 10.1126/science.abl5470).
“By all the traditional metrics of single-molecule magnets, they’re the best,” says Nicholas Chilton of the new molecules. Chilton, who’s based at the University of Manchester, collaborated on the work with Jeffrey Long at the University of California, Berkeley, and Benjamin Harvey at the US Naval Air Warfare Center Weapons Division. Although the molecules’ magnetism only reveals itself at low temperatures, Chilton hopes that these dilanthanide complexes might pave the way for new types of powerful yet lightweight permanent magnets.
Roberta Sessoli of the University of Florence, a pioneer of single-molecule magnets who was not involved in the work, says “this really is a very, very important piece of work. This is something that is going to remain as a milestone.”…
Metal-containing organic molecules that exhibit magnetism could one day offer a lightweight, flexible alternative to the relatively dense metal and ceramic magnets used in today’s engines, turbines, and electronics. Researchers have shown that a promising but unstable molecular magnet can become stable when 3D printed (Nano Lett. 2022, DOI: 10.1021/acs.nanolett.1c01879).
In recent years, chemists have built molecular magnets that have magnetic fields comparable to those of conventional magnets at room temperature. But even promising ones, such as vanadium hexacyanochromate, remain sensitive to the environment, says Shenqiang Ren, a materials scientist at the University at Buffalo. “You have to test them in a glove box,” he says. Ren wanted to mix a molecular magnet with a printing resin with the hope that the plastic casing might protect the material from the open air.
Rodolphe Clérac, chercheur en chimie de coordination au Centre de recherche Paul Pascal (CRPP – CNRS et Université de Bordeaux ) nous parle de son projet de recherche ! Il est lauréat 2021 de la médaille d’argent du CNRS pour son travail sur la physique et la chimie des matériaux moléculaires magnétiques
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