报告题目：A scientific adventure from the fine control of the magnetic interactions toward metal-organic magnets at room temperature
报告人：Rodolphe Clérac教授，Centre de Recherche Paul Pascal
报告时间：2025年6月21日（周六）9：30
报告地点：电化学楼C512会议室
报告人简介：Professor Rodolphe Clérac obtained his Ph.D. from the University Bordeaux I in France in 1997. He conducted postdoctoral research at Michigan State University (1998–1999) and Texas A&M University (1999–2000) . From 2000 to 2008, he was an Associate Professor at IUT Bordeaux I and and Centre de Recherche Paul Pascal (CRPP). Since 2008, he has been a researcher at the CRPP, promoted to Senior Researcher (DR2) in 2013 and to Senior Researcher (DR1) in 2018. In 2022, he became vice-director of the CRPP.He is a pioneer in molecular magnetic materials, he received the Silver Medal of the CNRS in 2021. He was ranked in the world's top 2% of scientists by the University of Stanford in 2020–2023 and listed by Research.com in 2022–2024 for being among the 1000 chemists in the world (953 en 2024), and in France (15 en 2024).His research focuses on molecular magnet, with pioneering work in single-chain magnet design, switchable magnetic materials, and metal-organic magnets. He has published 541 papers, with an h-index of 88 and over 28500 citations.
报告简介：Magnets derived from inorganic materials (e.g., oxides, rare earth and intermetallic compounds) are key components of modern technological applications. Despite extensive success in a broad range of applications, these inorganic magnets suffer several drawbacks, such as energetically expensive fabrication, limited availability of certain constituent elements, high density, and poor scope for chemical tunability. A promising design strategy for next-generation magnets relies on the versatile coordination chemistry of abundant metal ions and inexpensive organic ligands.
Ordered magnets are the result of cooperative effects between magnetic spins. The choice of the linker between the spin carriers is therefore a crucial element to control, as it mediates the communication and interactions between them. The use of a redox-active bridging ligand as a linker is a particularly attractive strategy. By oxidation(s) or reduction(s), it can act as a control switch of the magnetic interactions. While in its diamagnetic state, it mediates usually weak magnetic interactions, in its radical form, it can promote a better spin delocalization inducing large magnetic interactions and in the same time, a good electronic conductivity which could lead to new high TC conductive magnets. In this pedagogical presentation, the step-by-step rational design of new magnetic systems based on redox-active ligands will be discussed and illustrated by (i) paramagnetic dinuclear M(II) complexes, [M2(tphz)(tpy)2](PF6)4 (M = Co or Ni; tpy = terpyridine; tphz = tetrapyridophenazine) , (ii) a two-dimensional coordination network, Cr(pyrazine)2Cl2, which is a ferrimagnet and a semiconductor (left part of the figure below) and (iii) lightweight molecule-based magnets (right part of the figure below), which feature critical temperatures up to 515 K, and unprecedented 0.75-Tesla room-temperature coercivity.
