Isotope Enrichment Via Electron Attachment

该项目代表了有机的持续支持 动力学程序的研究杰拉尔德R。史蒂文森和 Richard C.伊利诺斯州州立大学的赖特。 工作 涉及到建立中立者和 化合物及其带负电荷的对应物。 以来 平衡位置随特定同位素而变化， 产生了一种新的同位素分离方法 本研究旨在发展一个热力学方案 可用于分离分子同位素 异构体 伊利诺伊州小组此前曾观察到， 溶液态和固体态电子亲合势 共轭有机材料的区别仅在于取代基 一个或多个原子具有不同的同位素 经验相当戏剧性（高达几百卡/摩尔） 变化 这意味着有机同位素的减少 异构体（例如，二苯甲酮和二苯甲酮-O-18）， 将导致溶液中碱金属的摩尔量不足 在两种同位素异构体之间的竞争中， 电子。 由于溶液中的电子亲合势， 材料不一样，O-18的部分富集 同位素可以像分离自由基一样容易获得 中性分子的阴离子。 这种同位素方法 将探索各种同位素的浓缩，包括 C-13 O-18和N-15 此外，统计热力学 将开发一个模型，可以用来预测 电子交换的平衡常数 同位素异构体

This project represents continuing support by the Organic Dynamics Program for the research of Gerald R. Stevenson and Richard C. Reiter of Illinois State University. The work involves the establishment of equilibria between neutral compounds and their negatively charged counterparts. Since the position of equilibrium varies with particular isotopes, this has led to a new method for isotope separation. This research is directed at developing a thermodynamic scheme that can be utilized for the separation of molecular isotopic isomers. The Illinois State group has previously observed that the solution state and solid state electron affinities of conjugated organic materials differing only by the substitution of one or more atoms with isotopically different atoms experience rather dramatic (up to several hundred cal/mol) changes. This means that the reduction of organic isotopic isomers (e.g., benzophenone and benzophenone-O-18) with deficient molar amounts of alkali metal in solution will result in a competition between the two isotopic isomers for the added electrons. Since the solution electron affinities of the two materials are not the same, the partial enrichment of the O-18 isotope can be achieved as easily as separating the radical anions from the neutral molecules. This method of isotope enrichment will be explored for a variety of isotopes including C-13, O-18 and N-15. Further, a statistical thermodynamic model will be developed that can be utilized to predict the equilibrium constants for electron exchange between the isotopic isomers.