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

这一无机化学、生物无机化学和金属有机化学项目的奖项支持克莱姆森大学化学系约瑟夫·W·科利斯博士对过渡金属-主族固体的新合成方法的研究。超临界流体的反应温度相对较低，可以分离出动力学稳定的相，否则很容易获得。将在超临界氨或乙二胺中制备通式为AxMyEz的固体，其中A=碱金属，M=铜，银，E=S，Se。还将尝试使用铋和碲。由此得到的化合物有望具有低维结构和潜在的有趣的电子性质。合成的主要策略将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)取代一价硬币金属。此外，还将开发一些特殊的水溶液的新技术。含有高浓度卤化物、硫化物或碳酸盐的热水卤水将用于在类似于自然形成宝石和矿物的条件下合成新的金属硫化物。固体化合物在电子器件中具有重要的应用价值，因此开发新材料和新的材料制备方法是材料研究的重要领域。在该奖项的支持下开发的新方法不仅是新颖的，可能会产生有用的新固体，而且可能对理解自然界中矿物的形成也有影响。