Dynamics of Heterogeneous Reactions

普林斯顿大学的安德鲁·博卡斯利教授和史蒂文·伯纳塞克教授得到了有机动力学研究计划的支持，目的是从分子水平上了解固体表面的化学反应过程，主要主题是无机表面的有机部分。第一个项目使用扫描隧道显微镜来研究二维自组装产生的手性结构。本研究的最终目的是开发手性模板以实现固体上的不对称合成，但首先要寻求更好的结构表征和控制。离子-碳氢化合物的相互作用将通过在控制良好的自组装表面上分散小的有机探针离子，如吡啶或吡咯来探测。将探索官能团和链长效应，以阐明与氢碳和氟碳混合的附着层中的化学相互作用。利用半导体激光吸收光谱进一步研究内能对产生二氧化碳、一氧化碳、水和甲醛的金属解离吸附过程的影响，以确定催化氧化反应产物的内态分布。激光泵浦物种以克服表面反应的障碍仍然是一个目标，这里的工作重点是甲烷解离反应。功能化的硅和金属表面对于微电子和分子电子学的应用越来越重要。来自这些研究的基本信息将有许多最终用途，包括开发传感器、分离、催化、电子学、质谱学和电化学。

Professor Andrew Bocarsly and Steven Bernasek of Princeton University are supported by the Organic Dynamics Program for studies with the goal of obtaining a molecular-level understanding of chemical reaction processes on solid surfaces, with a major theme being organic moieties on inorganic surfaces. The first project uses scanning tunneling microscopy to examine chiral structures resulting from two-dimensional self-assembly. Ultimately this research aims at developing chiral templates to achieve asymmetric synthesis on solids, but first, better characterization and control of the structures is sought. Ion-hydrocarbon interactions will be probed by scattering small organic probe ions such as pyridine or pyrrole on well-controlled self-assembled surfaces. Functional groups and chain length effects will be explored for clarifying chemical interactions in adlayers with mixed hydro- and fluoro-carbons. The effects of internal energy on the course of dissociative adsorption on metals producing carbon dioxide, carbon monoxide, water and formaldehyde will be further examined using diode laser absorption spectroscopy to determine the internal state distribution of the products of catalytic oxidation reactions. Laser pumping of species to overcome barriers to surface reactions continues to be a goal with work here focused on methane dissociation reactions. Functionalized silicon and metal surfaces are of growing importance for micro- and molecular-electronics applications. The fundamental information from these studies will have many end uses including the development of sensors, separations, catalysis, electronics, mass spectrometry as well as electrochemistry.