Photodetachment of metalloid Ge9-cluster compounds according to ligand environment as model compounds for nanoscaled materials of group 14

本课题组最近的研究结果表明，类金属团簇化合物Ge9[Si(SiMe3)3]3¯1具有丰富的光物理和光化学性质。由于1是纳米级锗粒子的结构明确的分子模型化合物，因此光伏和光电子系统领域的基本方面可以在拟议的项目中解决。另一方面，应该揭示这种类金属团簇的性质如何受到配体、反离子或团簇在溶液中的浓度的变化的影响。因此，这种变化对紫外光光激发性质的影响将得到解决，其中，在1的情况下导致电子分离。所提议的项目的突出方面是，这里的大型和易于修改的星团打开了主要通过时间分辨吸收光谱进行详细的、时间分辨的光分离研究的可能性。该研究也可能为同类化合物Si和Sn的比较打开大门，以揭示中心四元元素对性质的影响。对结果的解释将得到量子化学计算的支持，部分是与密苏里大学的安德烈·克莱本博士合作进行的。基于这些结果，可以实现纳米级14族粒子的结构-性质关系，也表明了拟议研究项目的技术相关性。

Recent results from our groups revealed that the metalloid cluster compound Ge9[Si(SiMe3)3]3¯ 1 exhibits a rich photophysics and photochemistry. As 1 is a structurally well defined molecular model compound for nanoscaled germanium particles, fundamental aspects of the fields of photovoltaic and optoelectronic systems can be addressed within the proposed project. On the other hand it should be revealed how the properties of such metalloid clusters are influenced by variation of ligand, counter ion or concentration of the cluster in solution. Thereby, the influence of such a variation on the photo excitation properties by UV light will be addressed, which, in case of 1 leads to electron detachment. The outstanding aspect of the proposed project is that here the large and easily modifiable cluster opens the possibility for detailed, time resolved investigations of the photo detachment performed mainly via time resolved absorption spectroscopy. The investigations might also open the door to comparable compounds of the homologues Si and Sn to reveal the influence of the central tetrel element on the properties. The interpretation of the results will be supported by quantum chemical calculations, partly in collaboration with Dr. Andre Clayborne at the University of Missouri. Based on these results structure-property relations for nanoscaled group 14 particles are achievable, also indicating the technical relevance of the proposed research project.