MRI: Acquisition of an X-ray Absorption Fine Structure (XAFS) source for Chemical and Spectroscopic Research and Training at the University of Pennsylvania

该奖项由主要研究仪器项目和化学研究仪器项目共同支持。宾夕法尼亚大学正在获取具有同步加速器质量光谱能力的X射线吸收精细结构(XAFS)源，以支持Daniel Mindiola教授及其同事Marisa Kozlowski、Eric Detsi和Neil C.Tomson的研究。该仪器促进了化学、工程和材料科学领域的研究。XAFS揭示了固体和固溶态材料的局域结构分析和未占据局域电子态的收集信息。XAFS是表征新分子的结构和电子性质以及预测和解释由此产生的反应性的首选光谱方法。光谱揭示了在成键和配位环境中的氧化态分配和共价度的信息，同时允许表征固相和溶液相的块状材料。这一工具加强了许多部门各级学生的教育、研究和教学努力，并提供了在附近机构使用的便利条件。授予XAFS来源旨在加强所有级别的研究和教育，特别是在化学、工程和材料科学等领域。研究的重点是铁化合物对氮的活化；前催化剂、氧化前催化剂和顺磁性物种的孤立反应物种；以及模型表面调查。此外，其他研究包括纳米材料的制备和包括纳米孔电极和液体电极的电化学储能系统的研究。它还协助使用电催化剂将二氧化碳还原为含碳有机化合物，表征出溶合成的稳定和抗结焦的多相催化剂，探索镍催化的碳-碳键形成反应，以及研究与能源相关的反应的催化系统。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This award is jointly supported by the Major Research Instrumentation and the Chemistry Research Instrumentation programs. The University of Pennsylvania is acquiring an X-ray absorption fine structure (XAFS) source with synchrotron-quality spectra capabilities to support the research of Professor Daniel Mindiola and colleagues Marisa Kozlowski, Eric Detsi and Neil C. Tomson. This instrument facilitates research in the areas of chemistry, engineering, and materials science. XAFS reveals local structural analysis and collecton information about the unoccupied local electronic states of solid and solution state materials. XAFS is the spectroscopic method of choice for characterizing the structural and electronic properties of new molecules as well as for predicting and explaining resulting reactivity. Spectra reveal information about oxidation state assignments and the degree of covalency in bonding and coordination environments, while allowing for the characterization of bulk material in solid and solution state phases. This instrument enhances the educational, research, and teaching efforts of students at all levels in many departments as well as provides accessibility for use at nearby institutions. The award of the XAFS source is aimed at enhancing research and education at all levels, especially in areas such as chemistry, engineering, and materials science. Research focuses on nitrogen activation by iron compounds; precatalysts, oxidized precatalysts, and isolated reaction species for paramagnetic species; and model surface investigations are pursued. In addition, other investigations include nanomaterial preparation and the study of electrochemical energy storage systems involving nanoporous electrodes, and liquid electrodes. It also assists in the use of electrocatalysts for the reduction of carbon dioxide to carbon-containing organic compounds, the characterization of exsolution-synthesized stable and coking-resistant heterogeneous catalysts, exploration of nickel catalyzed carbon-carbon bond forming reactions, and the study of catalytic systems for energy relevant reactions.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.