Chemistry of New Zintl Phases in Supercritical Fluids

超临界流体中新 Zintl 相的化学

• 批准号: 9714408
• 负责人: Joseph Kolis
• 金额: $ 28万
• 依托单位: Clemson University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-02-01 至 2002-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9714408&HistoricalAwards=false
• 关键词: Chemistry; New; Zintl; Phases; Supercritical

This award in the Inorganic, Bioinorganic, and Organometallic Chemistry Program supports research by Dr. Joseph W. Kolis, Chemistry Department, Clemson University, for the study of novel synthetic methods for transition metal-main group solids. The relatively low reaction temperature of supercritical fluids permits isolation of kinetically stabilized phases not otherwise easily obtainable. Solids of the general formula AxMyEz, where A=alkali metal, M=Cu, Ag, and E=S, Se, will be prepared in supercritical ammonia or ethylenediamine. Attempts will also be made to use bismuth and tellurium. The resulting compounds are expected to have low dimensional structures and potentially interesting electronic properties. A dominant strategy for the synthesis will be to replace monovalent alkali metals with divalent cations, or replacement of monovalent coinage metals with open shell transition metals such as manganese (II) or iron (II). In addition, new techniques will be developed for some unusual aqueous solvents. Hydrothermal brines with high concentrations of halides, sulfides or carbonates will be used to synthesize new metal chalcogenides under conditions similar to those under which naturally occurring gems and minerals form. Solid state compounds are useful in electronic devices, so development of new materials and new methods to prepare materials are important areas of research. The new methods to be developed with the support of this award not only are novel and may result in useful new solids, but may have implications for understanding formation of minerals in nature as well

该奖项属于无机、生物无机和有机金属化学项目，支持克莱姆森大学化学系 Joseph W. Kolis 博士的研究，旨在研究过渡金属主族固体的新型合成方法。 超临界流体相对较低的反应温度允许分离不易获得的动力学稳定相。 通式AxMyEz的固体，其中A=碱金属，M=Cu、Ag，并且E=S、Se，将在超临界氨或乙二胺中制备。 还将尝试使用铋和碲。 所得化合物预计具有低维结构和潜在有趣的电子特性。 合成的主要策略是用二价阳离子取代一价碱金属，或用开壳过渡金属如锰 (II) 或铁 (II) 取代一价造币金属。 此外，还将针对一些不常见的水性溶剂开发新技术。 含有高浓度卤化物、硫化物或碳酸盐的热液将用于在类似于天然宝石和矿物形成的条件下合成新的金属硫族化物。 固态化合物可用于电子器件，因此新材料的开发和材料制备的新方法是重要的研究领域。 在该奖项的支持下开发的新方法不仅新颖，可能会产生有用的新固体，而且可能对理解自然界矿物的形成产生影响