Discrete and Extended Arrays of Main Group Elements and Transition Metals

主族元素和过渡金属的离散和扩展阵列

• 批准号: 0719396
• 负责人: Kenton Whitmire
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-15 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0719396&HistoricalAwards=false
• 关键词: Discrete; Extended; Arrays; Main; Group

This award in the Inorganic, Bioinorganic and Organometallic Chemistry program supports research by Professor Kenton H. Whitmire of Rice University to explore molecular routes to a variety of nanoscale materials with interesting magnetic properties composed of main group elements (E) and transition metals (M). Cluster molecules with well-defined shape and size will be converted into E-M materials by suitable thermal, chemical or photochemical treatment in order to define the factors that will permit control of the stoichiometry and properties of the resulting materials. In some cases nanoparticles arise directly upon mixing molecular precursors, and attempts will be made to isolate and characterize discrete molecular species that are intermediates on the pathway to particle growth in order to understand how the nanoparticles develop. Structures of these intermediates will be compared to the final materials for insight into the growth mechanism. One particular series that will be targeted is the iron/manganese pnictide system. A number of discrete cluster compounds having the correct E-M stoichiometry for conversion to known MxEy (M = Fe, Mn; E = pnictogen) phases are available. The conditions that are required to achieve these conversions as well as the effect of ancillary ligands and bound-organic functions will be examined in order to tailor the decompositions to optimize conditions and product properties. This system is particularly flexible because isostructural cluster compounds with different E or M constituents can be prepared and used to introduce dopants into the final materials. In conjunction with these fundamental studies, conditions for production of the cluster products will be optimized in order to make use of these compounds viable. The synthesis of magnetic materials as nanoparticles of well-defined composition and properties will contribute to the fundamental knowledge and understanding of the chemistry involved in the production of important materials that may be employed in the electronics and related industries. This project will also train students for the workforce that is necessary to support the electronics industry.

该奖项属于无机、生物无机和有机金属化学项目，支持莱斯大学 Kenton H. Whitmire 教授的研究，探索各种纳米级材料的分子途径，这些材料具有由主族元素 (E) 和过渡金属 (M) 组成的有趣的磁性。 具有明确形状和尺寸的簇分子将通过适当的热、化学或光化学处理转化为电磁材料，以确定允许控制所得材料的化学计量和性质的因素。 在某些情况下，纳米颗粒直接在混合分子前体时产生，并且将尝试分离和表征作为颗粒生长途径的中间体的离散分子种类，以便了解纳米颗粒如何发育。这些中间体的结构将与最终材料进行比较，以深入了解生长机制。将针对的一个特定系列是铁/锰磷化物系统。 许多离散簇化合物具有正确的 E-M 化学计量，可转化为已知的 MxEy（M = Fe、Mn；E = 磷元素）相。将检查实现这些转化所需的条件以及辅助配体和结合有机功能的影响，以便调整分解以优化条件和产品性能。该系统特别灵活，因为可以制备具有不同 E 或 M 成分的同构簇化合物并将其用于将掺杂剂引入最终材料中。结合这些基础研究，将优化簇产品的生产条件，以便使这些化合物的使用可行。将磁性材料合成为具有明确组成和特性的纳米颗粒，将有助于增强对可能用于电子及相关行业的重要材料的生产所涉及的化学的基础知识和理解。该项目还将培训学生成为支持电子行业所需的劳动力。