About the European Academy of Sciences (EURASC) :
“The European Academy of Sciences (EURASC) is a non-profit non-governmental, independent organization of the most distinguished scholars and engineers performing forefront research and the development of advanced technologies, united by a commitment to promoting science and technology and their essential roles in fostering social and economic development. One of the most important objectives of the Academy is the promotion of fundamental research and excellence in science and technology. The EURASC aims to recognize and elect to its membership the best European scientists with a vision for Europe as a whole, transcending national borders both in elections and in actions, and with the aims of strengthening European science and scientific cooperation and of utilizing the expertise of its members in advising other European bodies in the betterment of European research, technological application and social development.”
Centre de Recherche Paul Pascal, UMR CNRS 5031
115 Avenue Schweitzer, 33600 Pessac, FRANCE
Phone : +33 (0) 5 56 84 56 50
Dr. Xiaozhou Ma received one of two prizes for the best poster presented at the 7th European Conference on Molecular Magnetism which took place in Florence, Italy, the 15th-18th of September 2019.
The title of her poster was “Magnetic Exchange Coupling Promotion in Dinuclear Compounds with Redox-active Ligand”.
Xiaozhou Ma was a PhD student of P. Dechambenoit and R. Clérac who defended on the 11th of September 2019.
Rodolphe Clérac’s research has been recently cited by the CNRS Institute of Chemistry.
L’origine du magnétisme atypique de l’ion actinide Uranium(IV) enfin comprise
Les ions de terres rares et d’actinides, qui présentent des propriétés magnétiques remarquables étant données leurs structures électroniques, sont de bons candidats pour entrer dans la composition des aimants de nouvelle génération. Mais alors pourquoi, de manière atypique, l’uranium au degré oxydation IV n’est que faiblement magnétique, alors qu’au regard de sa structure électronique, ses propriétés devraient être comparables aux autres analogues de terres rares ou d’actinides?
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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
Stephanie Beach, of the Doerrer Group (Boston University), recently won a prestigious Chateaubriand Fellowship. The Chateaubriand Fellowship is a grant offered by the Embassy of France in the United States. It supports outstanding Ph.D. students from American universities who wish to conduct research in France for a period ranging from 4 to 9 months. Chateaubriand fellows are selected through a merit-based competition, through a collaborative process involving expert evaluators in both countries.
The program is divided into two subprograms: Humanities and Social Sciences (HSS) which supports those who seek to study Humanities and Social Sciences. Stephanie was awarded the Chateaubriand Fellowship in Science, Technology, Engineering, Mathematics & Biology-Health (STEM), which is for doctoral students who aim to initiate or reinforce collaborations, partnerships or joint projects between French and American research teams. This fellowship is offered by the Office for Science & Technology (OST) of the Embassy of France in partnership with American universities and French research organizations such as CNRS, Inserm and Inria.
Stephanie is currently working at the Centre de Recherche Paul Pascal, a CNRS lab, in Bordeaux, France from February through May of 2018 to partner with the group of Prof. Rodolphe Clérac. She is developing new variations of the Doerrer group thiocarboxylate lantern complexes for development as single molecule magnets.
Rodolphe Clérac has been selected to receive 2017 France-Berkeley Award for his project “Photomagnetic Metal-Cyanide Clusters”. This award, in recognition of scholarly excellence and commitment to advancing research relationships between France and the United States, will be presented during a symposium organized at the College de France in Paris on the 7th of June 2017.
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Congratulations to Professor Cameron Kepert (School of Chemistry); Eminent Professor Keith Murray; Dr Suzanne Neville (School of Chemistry) and Dr Rodolphe Clérac on their successful ARC Discovery grant. This project aims to develop ‘intelligent’ materials in which emergent properties arise due to the strategic combination of spin switching with other functionalities. Spin crossover is a versatile form of molecular switch which can reversibly change structure, colour and magnetism using convenient external stimuli. In probing new and interesting forms of interplay between technologically relevant properties, this work addresses the science of host-guest and electronic/magnetic systems and could lead to materials worthy of commercial development to underpin a range of future high-level technologies spanning low energy separations, molecular sensing, data storage, and electronic/magnetic/optical device componentry. Total funding: $612,500
Benjamin Wilson has been awarded the 2016 NZ France Friendship Fund Excellence Scholarship worth $25,000. It will go towards his PhD in supramolecular chemistry at University of Canterbury and the University of Bordeaux. His work in Bordeaux will be supervised by Rodolphe Clérac (CRPP) and Corine Mathionère (ICMCB). Congratulations Ben!