稀土-钒氧簇合物的离子热合成及磁学性质研究

项目名称： 稀土-钒氧簇合物的离子热合成及磁学性质研究

项目编号： No.21201054

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机化学

项目作者： 高元哲

作者单位： 河北师范大学

项目金额： 25万元

中文摘要： 传统的多酸化合物(POMs)，是一类骨架结构中富含Mo、W、V、Nb和Ta的多金属氧簇，钒氧簇是多金属氧簇的一个重要分支。本项目拟以磁学性质为功能导向，采用新颖的离子热合成方法，选择不同种类还原剂，使所有钒元素均处于还原态（IV）。（i）在咪唑类离子液体结构导向作用下，制备出新颖的稀土-钒氧簇纯无机大环结构；（ii）在离子液体和还原剂的协同结构导向作用下，以及第IVA主族元素(Si、Ge)辅助下，得到稀土金属桥连钒氧簇的多维结构，从而达到构筑新型稀土-钒氧簇合物的目的，期望能到得到具有开发应用前景的新型钒氧簇分子基磁性材料。研究新型钒氧簇合物的合成方法学，探讨相应目标产物的磁学性能，建立结构和性质间的构效关系，为此类化合物在磁学性能研究方面的应用提供理论与实践基础。该项目的成功实施，不仅可以丰富POMs合成方法学和结构化学，而且对于开发新型分子基功能材料具有重要科学意义。

中文关键词： 稀土；钒氧簇；取代型钒氧簇；离子热合成；磁学性质

英文摘要： Polyoxometalates (POMs), metal-oxygen clusters of the early transition elements (mostly molybdenum,tungsten, vanadium, niobium and tantalum) have been investigated extensively.Vanadium-oxide clusters are one of the most important polyoxometalates.In this work, a series of lanthanide-Polyoxovanadates(POVs) with superior magnetic properties will be synthesized under ionothermal conditions by choosing different types of reductant.（i）Lanthanide cations will be incoporated into the skeleton structure of vanadium oxide clusters to obtain the cyclic POVs by the structure dirceting role of the ionic liquid. (ii) With the help of main group elements (Si, Ge based on IVA), lanthanide cations will act as linking to connect with the vanadium oxide cluster to construct the multi-dimensional hybrids during the cooperative structure directing role of the ionic liquid and reducing agent. The studies on the synthesis methodolody and rules for POVs, and the relationships between structures and properties for these novel clusters will also be carried out.It will provide for the application of such compounds in the magnetic properties of theory and practice. The success of the project's implementation, can not only enrich the synthesis and structural chemistry of POMs, but also has important scientific significance for the devel

英文关键词： Lanthanide；Vanadium Oxide Cluster；Substituted-polyoxovanadates；Ionothermal Syntheses；Magnetic Properties