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快速发展的科学领域提供合理的合成新材料：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性效应。我们选择了这三个不同的领域，以加强我们在巴黎的实验室和四个德国团队之间的合作，这四个团队在比勒费尔德、美因茨、明兴和斯图加特/格勒诺布尔是该领域的领导者。由于各向异性势垒dsz2和量子磁隧道效应，单分子磁体是在阻挡温度以下表现为磁体的分子系统。这种行为只有几个已知的例子，我们建议用多氰酸盐和多金属氧酸盐来探索这一新领域(Collaboration Bielefeld，Mainz)。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：II.光磁学：光可以改变磁性质，导致长寿命的亚稳态磁态。我们建议将重点放在钴铁普鲁士蓝类似物上，它们的性质通过插入碱性阳离子而深度改变，以了解反应机理(与München合作)，并证明新的光物理磁性(与Mainz合作)。光学活性磁体和磁手性效应的证据：在光学活性磁体中，光应该通过自然二向色性(空间对称性破坏)或磁性二向色性(时间对称性破坏)来偏振。我们提出了一种新的µ-草酸双金属体系的从头算合理合成，对映体纯磁体及其磁光研究(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).