新型非经典低价稀土金属化合物的合成、反应性及磁学性能研究

非经典低价稀土化合物由于其具有较强的还原性，一直难以稳定合成并表征，直到最近几年才仅有几例完整的结构表征。通过本项目的实施，希望建立合成稳定中性非经典低价稀土配合物的新方法，实现一些标志性中性非经典一价和二价稀土配合物合成。尤其是首次探索正一价稀土钐和铥化合物的合成及表征，有助于进一步拓展对非经典稀土低价化合物的稳定性和成键规律的理解。通过研究中性非经典一价和二价稀土配合物的反应特性及其影响因素，为一些重要小分子（如氮气、CO、CO2等）的活化与转化开发新途径和新模式；同时可通过对其物理性质（磁性，XAS，UV-vis等）的研究以探索稀土金属离子价态和配体协同调控作用对稀土配合物分子磁性的影响，为合成新型低价稀土金属分子磁体提供借鉴。

Research on non-classical low valent rare earth complexes has been underdeveloped due to their low reductive potential and difficulty in stabilization. As a result, only a handful of cases have been reported until very recently. This project is aimed at building new methods in synthesis, stabilization and characterization of novel non-classical low valent rare earth complexes. This project will thus focus on the synthesis of mono- and di-valent rare earth complexes by introducing substitutional cyclopentadienyl ligands and various supporting ligands to the system. This project will try to synthesize the mono-valent Sm or Tm complexes for the first time which will help to expand the understanding of the stability and the bonding properties of these non-classical mono-valent complexes. Reactivity study on these complexes will provide new examples on small molecule activation such as N2, CO and CO2 etc. Due to their characteristic 4f electrons, the study on physical properties (magnetic, XAS, UV-vis) of these complexes will also provide new insights into their electron configuration, bonding and magnetism. Especially, the study on the magnetic properties may indicate new routes to the synthesis of single-molecule magnets.