Ligand design for multifunctional molecule-based magnetic materials

从广义上讲，分子基材料是一个术语，主要是为了区分经典的无机原子基固体和由预先设计的分子实体构建的材料。因此，分子基材料不是典型的固态化学的高温合成，而是通过软途径获得的，传统的途径是有机化学、配位化学和超分子化学。就像在生物系统中一样，基于分子的材料可以由几个特别设计的独特分子构建而成，其中的功能总和可以产生新的或不存在的特性。我的研究方向是实现基于分子的磁性材料，其中两种或多种物理性质之间存在相互作用。研究重点是制备和研究两类化合物，即含自旋四硫代戊烯（TTF）供体和自旋交叉（SCO）化合物。在第一个项目中，TTF供体以共价方式附加带有自旋的硫酰自由基，将与阴离子结合形成具有磁性和/或导电性的固体。对新的自旋轴承供体进行详细的结构和物理研究，将使我们能够评估它们是否适合用于制备铁磁导体。在第二个项目中，一个新的开关材料家族被称为自旋交叉化合物将被制备和研究。例如，你可以在这些材料中施加光或改变温度来改变它们的磁性行为。我们对制备两个或多个开关单元共价连接在一起的系统特别感兴趣，因为通过这种方式我们可以研究通过不同连接器单元之间的协同性如何影响它们的开关特性。最大的挑战是开发在室温或室温附近切换的系统，因为这对于设备应用来说更便宜。该项目代表了一种独特的方法，用于开发和理解两类多功能分子基磁性材料，这些材料可能会导致商业应用。

Molecule-based materials, in the broad sense, is a term coined essentially to make a distinction between classic inorganic atom-based solids and materials built from pre-designed molecular entities. Thus, instead of high temperature synthesis typical of solid state chemistry, molecule-based materials are obtained through soft routes, traditionally from organic chemistry, coordination chemistry and supramolecular chemistry. As in biological systems, molecule-based materials can be built from several specifically designed unique molecules, where the sum of functions could yield new or non-existing properties. My research program is directed towards the realization of molecule-based magnetic materials where there is interplay between two or more physical properties. Research will focus on the preparation and study of two classes of compounds namely, spin bearing tetrathiafulvalene (TTF) donors and spin crossover (SCO) compounds. In the first project, TTF donors covalently appended with spin bearing verdazyl radicals will be combined together with anions to form solids with magnetic and/or conducting properties. Detailed structural and physical studies of new spin bearing donors will enable us to assess whether or not they are suitable building blocks for the preparation of ferromagnetic conductors. In the second project, a new family of switching materials known as spin crossover compounds will be prepared and studied. These are materials in which for example you can apply light or a change in temperature in order to switch their magnetic behavior. We are particularly interested in preparing systems where two or more switching units are covalently linked together, since in this way we can investigate how the cooperativity between the units through different linkers affects their switching properties. The greatest challenge is to develop systems that switch at or around room temperature since this would be cheaper for device applications. This program represents a unique approach for the development and understanding of two classes of multifunctional molecule-based magnetic materials that could lead to commercial applications.