U.S.-Japan Cooperative Research: Solid-State Dynamics

该奖项为持续合作提供支持 固态动力学研究项目，教授之间 大卫N亨德里克森，化学系，大学 加州，圣地亚哥，和Michio Sorai教授，化学 日本大坂大学热力学实验室。 的 与配体、抗衡离子和 甚至晶体中的溶剂化物分子也能显著影响 涉及过渡金属配合物的几种现象 固体状态。 混合体系中的分子内电子转移 价络合物，自旋态相互转换， 铜和镍的交叉络合物和热色性 络合物是目前正在研究的现象。 在所有这些 现象，在固态分子间的相互作用是 重要的是控制事件。 一项研究表明， 这些相变所涉及的动力学将有助于 为了阐明控制这些的因素， 现象。 热容量测量和各种 光谱技术被用来描绘 宏观和微观细节涉及上述 现象。 热力学研究是一个强有力的工具， 阐明现象的能量和熵方面， 从中可以得到更好的证据， 过渡是否存在。 此外，根据过渡 熵，就有可能发现微观过程 参与了一种相变， 结构研究无法发现。 另一方面，在一项研究中， 光谱学和X射线衍射为我们提供了 详细的微观信息在原子或电子 水平这项建议的目的是将这些 为了研究这些阶段的机制， 电子的跃迁，要么直接，要么 间接地，重要的角色。 参与这项研究的两个研究小组的技能 项目既全面又互补; 日本集团在宏观经济方面具有相当的专业知识 量热研究和具有类似专业知识的美国小组 显微光谱学和结构研究中。 由于他们的背景不同， Hendrickson和Sorai将带来完全不同的观点 发展出一个给定有序无序转变的模型。 如果成功的话，这个项目将产生相当大的 对这一复杂领域的贡献。

This award provides support for a continuing cooperative research project on solid-state dynamics, between Professor David N Hendrickson, Department of Chemistry, University of California, San Diego, and Professor Michio Sorai, Chemical Thermodynamics Laboratory, Osaka University, Japan. The onset of dynamics associated with ligands, counterions and even solvate molecules in crystals can dramatically affect several phenomena involving transition metal complexes in solid state. Intramolecular electron transfer in mixed- valence complexes, spin-state interconversion in spin- crossover-complexes, and thermochroism in copper and nickel complexes are current phenomena being studied. In all these phenomena, intermolecular interactions in the solid state are important in controlling the events. A study of the onset of the dynamics involved in these phase transitions will help considerably to elucidate the factors controlling these phenomena. Heat capacity measurements and a variety of spectroscopic techniques are being employed to delineate the macroscopic and microscopic details involved in the above phenomena. Thermodynamic studies serve as a powerful tool to elucidate energetic and entropic aspects of a phenomenon, from which one can gain better evidence as to whether a phase transition exists or not. Moreover based on the transition entropy, it is possible to discover the microscopic processes involved in a phase transition that spectroscopic and structural studies fail to detect. On the other hand, spectroscopies and X-ray diffraction provide us with very detailed microscopic information at the atomic or electronic level. The aim of this proposal is to bring together these techniques in order to study the mechanisms of those phase transitions in which electrons play, either directly or indirectly, important roles. The skills of the two research groups involved in this project are both comprehensive and complementary; the Japanese group having considerable expertise in macroscopic calorimetric studies and the US group having similar expertise in microscopic spectroscopies and structural studies. Because of their very different backgrounds Professors Hendrickson and Sorai will bring quite different perspectives to developing a model for a given order-disorder transition. If successful, this project should make a considerable contribution to this complex area.