Metal-Metal Bonded Compounds of the Earliest Transition Metals

该项目涉及富金属卤化物的探索性合成和物理表征，以及越来越多的3族过渡金属硫族化合物。该研究将以一组独特的高度还原的化合物为特色，其中金属团簇相和缩合团簇相由名义金属八面体中的强结合间隙元素稳定。簇主元素包括钪、钇、镧系元素(R)、卤素、硫、硒和碲，而间隙元素通常是晚期过渡金属。这些簇-间隙组合通常与纯金属系统中存在的间隙的局部相互作用有关。将强调新化合物的鉴定和表征，包括仅通过粉末模式已知的相，特别是新的和新的富含金属但缺乏电子的硫属化合物。感兴趣的相的物理性质将通过晶体结构、电子导电性、磁化率和光电子能谱测量来定义，这些将通过扩展huckel（波段）计算来增强。在金属-金属键合化合物中追求新的和意想不到的化学和材料性质，并了解它们的键合性质和物理性质，扩展了固态化学的可能边界。最终，这样的研究将涵盖范围广泛的新材料，充分的信息和经验将允许更广泛的系统化和合理的预测新的功能材料类别

9809850CorbettThe project involves exploratory synthesis together with physical characterization of metal-rich halides and, increasingly, chalcogenides of group 3 transition metals. The studies will feature a unique group of highly reduced compounds in which metal cluster and condensed cluster phases are stabilized by strongly bound, interstitial elements in nominal metal octahedra. The cluster hosts will include Scandium, Yttrium, and the lanthanides (R), halogens, the chalcogens, Sulfur, Selenium and Tellurium, with the interstitials usually being late transition metals. These cluster-interstitial combinations are in a general way related to local interactions present for interstitials in pure metal systems. Identification and characterization of new compounds, including phases known only by powder patterns, will be emphasized, especially for the new and novel metal-rich but electron-poor chalcogenides. Physical properties of interesting phases will be defined by crystal structure, electronic conductivity, magnetic susceptibility, and photoelectron spectroscopic measurements, and these will be augmented by extended-Huckel (band) calculations.% % %Pursuing new and unexpected chemistry and materials properties in metal-metal bonded compounds together with an understanding the nature of their bonding and physical properties expands the boundaries of what is possible in solid state chemistry. Ultimately such investigations will cover a wide range of new materials for which sufficient information and experience will allow broader systemization and reasonable predictions of new classes of functional materials.***