An Isotopic Probe into Electron Distribution in Aromatics and Homoaromatics

这项来自有机动力学项目的RUI拨款支持伊利诺伊州立大学谢丽尔·史蒂文森教授继续研究轮烯和高环烯的阴离子和阴离子自由基的工作。这些核磁共振和电子顺磁共振波谱研究将利用氚同位素微扰技术。研究的四个重点是开环和闭环16-环烯结构之间平衡的测定，16-8-和16-6-双环烯中Sigma键电子分布的表征，8-和16-环烯非键轨道简并分裂的氘效应的分析，以及芘溶液电子亲和力的同位素效应。在这个项目中，史蒂文森博士将对不同大小的环烯的阴离子和阴离子自由基进行光谱研究。她的本科生研究使用了氚同位素微扰技术来研究它们的成键性质和电子分布。关于同位素对轨道分裂和溶液电子亲和力影响的基础研究将得到合作理论研究的支持。

This RUI grant from the Organic Dynamics Program supports the continuing work of Professor Cheryl Stevenson at Illinois State University to study anions and anion radicals of annulene and homoannulenes. These NMR and EPR spectroscopic studies will make use of deuterium isotopic perturbation techniques. The four focal point of research are the determination of equilibria between ring-opened and ring-closed 16 annulene structures, the characterization of the electron distribution in sigma-bonded 16 - 8 - and 16 - 6 -bisannulenes, the analysis of the deuterium effect on the splitting of the degeneracy of non-bonding orbitals of 8 - and 16 -annulenes, and the isotope effect of the solution electron affinity of pyrene. In this project Dr. Stevenson will conduct spectroscopic studies on dianions and anion radicals of differently sized annulenes. Her undergraduate research employs the deuterium isotopic perturbation technique to investigate their bonding properties and electronic distributions. The fundamental studies on the isotope effect on orbital splitting and solution electron affinities will be supported by collaborative theoretical studies.