The Reactions and Energetics of Organic Radical Ions in Solution

在有机动力学项目的支持下，弗农·D·帕克教授研究了有机自由基离子在溶液中的反应和能量学。犹他州州立大学化学系的帕克教授研究了电荷中心和自由基中心之间的耦合对其中一个中心或两个中心的反应性的影响。例如，甲氧基和N，N-二甲氨基取代基将电荷中心和自由基中心分开，大大提高了芳烃自由基阳离子的二聚速率。通过对具有不同程度的自旋-电荷耦合的自由基离子的研究，寻求对反应性与耦合程度之间的相关性的假设的动力学支持。犹他州立大学化学系的弗农·D·帕克教授因研究一类被称为自由基离子的化合物的反应活性的影响因素而得到有机动力学项目的支持。这些化合物包含一个带正电荷或负电荷的原子(离子)以及一个比通常发现的原子少一个电子的原子(自由基)，通常表现出与只包含这些结构元素之一的分子(自由基或离子)不同的反应活性。帕克教授正在探索一种假设，即原子或分子基团介入自由基和离子中心之间会影响这些中心的反应性，这些基团提供最大的偶联，导致反应性最戏剧性的变化。自由基和离子在各种化学和生化体系中都是重要的中间体，在辐射化学和毒理学等领域也具有重要意义。帕克教授的研究使人们对影响这些重要物种的化学性质的因素有了更基本的了解。

With the support of the Organic Dynamics Program, Professor Vernon D. Parker studies the reactions and energetics of organic radical ions in solution. Professor Parker, of the Department of Chemistry at Utah State University, addresses the influence of coupling between charge and radical centers on the reactivity of one or both of these centers. For example, dimerization rates of arene radical cations are greatly enhanced by methoxy and N,N-dimethylamino substituents which separate the charge and radical centers. Kinetic support for the hypothesis of a correlation between reactivity and extent of coupling is sought through study of radical ions with varying degrees of spin-charge coupling. Professor Vernon D. Parker, of the Department of Chemistry at Utah State University, is supported by the Organic Dynamics Program for his studies of the factors influencing the reactivity of a class of compounds known as radical ions. These compounds, which contain an atom bearing a positive or negative charge (an ion) as well as an atom bearing one less electron than ordinarily found (a radical), often display reactivity distinct from that of a molecule containing only one of these structural elements (radical or ion). Professor Parker is exploring the hypothesis that atomic or molecular groups intervening between the radical and ion centers influence the reactivity of these centers, with those groups providing the greatest `coupling` leading to the most dramatic alteration of reactivity. Radicals and ions appear as important intermediates in a wide variety of chemical and biochemical systems and are additionally significant in areas such as radiation chemistry and toxicology. Professor Parker's studies are leading to the development of a more fundamental understanding of those factors influencing the chemical properties of these important species.