Design, synthesis, and physical studies of multifunctional magnetic materials: optically active (conductive) magnets, high spin molecules

我们的目标是在三个迅速发展的科学领域提供合理合成的新材料：各向异性高自旋分子（单分子磁体），光磁性，光学活性磁体和磁手征效应。我们选择了这三个不同的领域来加强我们在巴黎的实验室与四个德国团队之间的合作，这四个团队是比勒费尔德，美因茨，慕尼黑和斯图加特/格勒诺布尔的领导者。I.单分子磁体是由于各向异性势垒DSz 2和量子磁隧穿而在阻断温度以下表现为磁体的分子系统。只有少数几个例子，这种行为是已知的，我们建议探索这一新的领域与聚氰酸酯和聚氧乙烯（合作比勒费尔德，美因茨）。光与（磁化）物质的相互作用是一个非常令人兴奋和有前途的领域：光磁性：光可以改变磁性，导致长寿命的亚稳磁性状态。我们建议专注于钴铁普鲁士蓝类似物，其性质通过插入碱金属阳离子进行深刻修改，以了解反应机制（与München合作）并证明新的物理磁性（与Mainz合作）。三.光学活性磁体和磁手征效应的证据：在光学活性磁体中，光应该通过自然二向色性（空间对称性的破坏）或磁二向色性（时间对称性的破坏）偏振。我们提出了一个新的μ-单取代基双金属系统，对映体纯磁体及其磁光研究的从头算合理合成（与斯图加特格勒诺布尔合作）。

Our aim is to provide rationally synthesised new materials in three scientific areas rapidly developing: anisotropic high spin molecules (single molecule-magnets), photomagnetism, optically active magnets and magneto-chiral effect. We chose these three different areas to enhance the collaboration between our laboratory in Paris an four german teams which are among the leaders in the field in Bielefeld, Mainz, München and Stuttgart/Grenoble. I. Single molecule magnets are molecular systems which behave as magnets below a blocking temperature due to an anisotropic barrier DSz2 and quantum magnetic tunneling. Only a few examples of this behaviour are known and we propose to explore this new field with polycyanometalates and polyoxometalates (Collaboration Bielefeld, Mainz). The interplay of light with (magnetized) matter is a very exciting an promising field: II. Photomagnetism: the light can modify the magnetic properties leading to long-live metastable magnetic states. We propose to focus on cobalt-iron Prussian blue analogues whose properties are deeply modified by the insertion of alkali cations to understand the reaction mechanisms (Collaboration with München) and to evidence new photophysical magnetic properties (Collaboration with Mainz). III. Optically Active Magnets and evidence of Magneto-Chiral Effect: in optically active magnets the light should be polarised both by natural dichroism (break of space symmetry) or by magnetic dichroism (break of time symmetry). We propose an ab initio rational synthesis of new µ-oxalato bimetallic systems, enantiomerically pure magnets and their magneto-optical study (Collaboration with Stuttgart-Grenoble).