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

美日合作研究：固态动力学

• 批准号: 9016821
• 负责人: David Hendrickson
• 金额: $ 1.76万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-04-01 至 1994-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9016821&HistoricalAwards=false
• 关键词: U.S.; Japan; Cooperative; Research; Solid

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.

该奖项为加州大学圣地亚哥分校化学系 David N Hendrickson 教授和日本大阪大学化学热力学实验室 Michio Sorai 教授之间的固态动力学持续合作研究项目提供支持。 与晶体中的配体、抗衡离子甚至溶剂化物分子相关的动力学的开始可以极大地影响涉及固态过渡金属配合物的几种现象。 混合价络合物中的分子内电子转移、自旋交叉络合物中的自旋态互变以及铜和镍络合物中的热变色是当前正在研究的现象。 在所有这些现象中，固态分子间相互作用对于控制事件非常重要。 对这些相变所涉及的动力学开始的研究将极大地有助于阐明控制这些现象的因素。 热容量测量和各种光谱技术被用来描绘上述现象中涉及的宏观和微观细节。 热力学研究是阐明现象的能量和熵方面的有力工具，从中可以获得关于相变是否存在的更好证据。 此外，基于相变熵，可以发现光谱和结构研究无法检测到的相变所涉及的微观过程。 另一方面，光谱学和 X 射线衍射为我们提供了原子或电子水平上非常详细的微观信息。该提案的目的是将这些技术结合起来，以研究电子直接或间接发挥重要作用的相变机制。 参与该项目的两个研究小组的技能既全面又互补；日本小组在宏观量热研究方面拥有丰富的专业知识，而美国小组在显微光谱和结构研究方面拥有类似的专业知识。 由于亨德里克森和索莱教授的背景截然不同，他们将带来截然不同的观点来开发给定有序-无序转变的模型。 如果成功，该项目将为这个复杂的领域做出相当大的贡献。