Synthesis and Characterization of New Molecular Clusters of Tetrels

加州大学戴维斯分校化学系的Phillip Power、Susan M.Kauzlarich和Matthew P.Augustine将研究一系列硅、锗和锡基簇合物的合成和表征，式为EnRm(E=Si、Ge或Sn；R=烷基、芳基或酰胺配体；n 10约200；n m)。在这项由化学部、材料研究部和多学科活动办公室资助的研究中，这些含硅和含锡的团簇将在受控条件下通过各种方法合成，其中硅、锗和锡也被称为较重的四元元素。初步工作已经产生了带帽的晶体四极管簇，其大小相对统一，从纳米尺度到低至约10-20埃(约25-200个原子)。通过分离这种团簇的结构良好的晶体，分子技术，例如核磁共振或X射线结晶学，将提供比目前可用于表征小的纳米团簇的更精确的数据。这项研究将产生新的团簇相，特别是硅和锗的团簇相，由于它们的电子性质与体态相比发生了变化，因此可能具有潜在的电子应用和/或新的光学性质。该提案的协作性质，以及三个研究小组的多样性，将为本科生、研究生和博士后提供绝佳的机会，获得非常广泛的研究领域的知识和技能，包括液态和固态的溶液化学、材料化学和核磁共振光谱学。该项目由化学合作研究计划(CRC)资助。

Phillip Power, Susan M. Kauzlarich and Matthew P. Augustine of the Department of Chemsitry at the University of California at Davis will examine the synthesis and characterization of a series of silicon, germanium and tin-based cluster compounds, of the formula EnRm (E = Si, Ge or Sn; R = alkyl, aryl or amide ligand; n 10 ca. 200; n m). In this research, funded by the Division of Chemistry, the Division of Materials Research and the Office of Multidisciplinary Activities, these Si and Sn-containing clusters, where Si, Ge and Sn are also called the heavier tetrel elements, will be synthesized by a variety of approaches under controlled conditions. Preliminary work has produced capped clusters of crystalline tetrels that have relatively uniform sizes from nanoscale dimensions to as low as ca. 10-20 angstrom (ca. 25-200 atoms). Through the isolation of well-formed crystals of such clusters, molecular techniques, e.g. with NMR or X-ray crystallography, will afford more precise data than currently available for the characterization of small nanoclusters. This research will produce new cluster phases, especially of silicon and germanium, that are likely to have potential electronics applications and/or novel optical properties owing to changes in their electronic properties from those seen in the bulk state. The collaborative nature of the proposal, combined with the diverse nature of the three research groups, will provide outstanding opportunities for undergraduates, graduate students, and post-docs to acquire knowledge and skills in very broad areas of research, including solution chemistry, materials chemistry and NMR spectroscopy in both the liquid and solid phases. This project is funded through the Collaborative Research in Chemistry Program (CRC).