Group 13 Chalcogenides: Molecules and Materials

该奖项由化学部门特别项目办公室颁发，以支持莱斯大学安德鲁·巴伦博士的持续研究。重点研究前体分子结构在13-16族材料化学气相沉积中的作用，以及新的13-族硫族化合物的合成和反应性。在发现稳定的笼状结构中间体可以形成亚稳固相之后，将研究在气相中保持笼状结构的条件。为此，将建立一个气溶胶- cvd系统，以消除气相分解。具体来说，镓和铟、硫化物、硒化物和碲化物的环状和笼状有机金属配合物将在设计的条件下合成并分解，以保持前驱体的结构完整性。新相将通过俄歇光谱、XPS、TEM、SEM、x射线衍射和电子衍射进行表征。相生长的机理研究将随后进行飞行时间质谱分析和分解产物的基质分离。其他研究将探讨使用硫化镓笼作为扩展中间相结构的分子构建块，以及使用硫化镓笼结构作为齐格勒聚合中铝氧烷的模型。与相应的氧化物相比，13-16族硫族化合物的基础化学研究还不够完善。这项研究将为设计和合成用于化合物半导体、催化和多孔沸石类材料的新型固相确定结构和动力学要求。

This award is made in the Office of Special Projects of the Chemistry Division in support of the continuing research of Dr. Andrew Barron at Rice University. The research will focus on the role of precursor molecular structure during chemical vapor deposition of Group 13-16 materials and the synthesis and reactivity of new Group 13-chalcogenide compounds. Having discovered that metastable solid phases can be formed from stable cage structure intermediates, conditions will be investigated which retain the cage structure in the gas phase. To this end, an aerosol-CVD system will be built which will eliminate gas phase decomposition. Specifically, cyclic and cage organometallic complexes of gallium and indium, sufides, selenides and tellurides will be synthesized and decomposed under conditions designed to preserve the structural integrity of the precursors, New phases will be characterized by Auger spectroscopy, XPS, TEM, SEM, x-ray diffraction and electron diffraction. Mechanistic studies of phase growth will be followed by time-of-flight mass spectrometry and matrix isolation of the decomposition products. Other studies will investigate the use of gallium-sulfide cages as molecular building blocks for extended mesophase structures and the use of caged gallium sulfide structures as models for alumoxanes in Ziegler polymerization. The fundamental chemistry of Group 13-16 chalcogenides is less well developed than the corresponding oxides This research will define the structural and kinetic requirements for the design and synthesis of new solid phases for applications in compound semiconductors, catalysis, and porous zeolite-like materials.