Estimation of Self-Exchange Electron Transfer Rate Constants for Organic Compounds from Stopped-Flow Studies
作者:Stephen F. Nelsen、Michael T. Ramm、Rustem F. Ismagilov、Mark A. Nagy、Dwight A. Trieber、Douglas R. Powell、Xi Chen、Jamie J. Gengler、Qinling Qu、Jennifer L. Brandt、Jack R. Pladziewicz
DOI:10.1021/ja970321j
日期:1997.6.1
k12(obsd)/k12‘(calcd) is in the range of 0.55−1.94 for all 47 reactions. The average ΔΔGij between observed activation free energy and that calculated using kii(fit) is 0.13 kcal/mol. Simulations using Jortner vibronic coupling theory to calculate k12 using parameters which produce the wide range of kii values observed predict that Marcus's formula should be followed even when V is as low as 0.1 kcal/mol
Contributions of Symmetric and Asymmetric Normal Coordinates to the Intervalence Electronic Absorption and Resonance Raman Spectra of a Strongly Coupled <i>p</i>-Phenylenediamine Radical Cation
作者:Susan E. Bailey、Jeffrey I. Zink、Stephen F. Nelsen
DOI:10.1021/ja021343v
日期:2003.5.1
transfer spectroscopy. ResonanceRamanexcitationprofiles in resonance with the lowest energy absorption band are measured. The normal modes of vibration that are most strongly coupled to the intervalence transition are identified and assigned by using UB3LYP/6-31G(d) calculations. Excited state distortions are obtained, and the resonanceRaman intensities and excitationprofiles are calculated by using
共振拉曼光谱、电子吸收光谱和光谱的时间相关理论用于分析强离域的 III 类分子的间隔电子转移特性,四烷基-对苯二胺自由基阳离子双 (3-oxo-9-氮杂双环[3.3.1]非-9-基)苯((k33)(2)PD(+))。该分子是强耦合有机间隔电子转移光谱的原型系统。测量与最低能量吸收带共振的共振拉曼激发曲线。通过使用 UB3LYP/6-31G(d) 计算来识别和分配与间隔过渡最强烈耦合的振动的正常模式。获得激发态失真,共振拉曼强度和激发曲线是通过使用拉曼光谱的时间相关理论计算的。最严重扭曲的法向模式都是完全对称的,但间隔电子转移吸收光谱通常根据基于沿非对称法向坐标位移的潜在表面之间的耦合的模型来解释。该模型为间隔化合物提供了方便的物理图片,但不足以解释光谱。仅由强耦合表面产生的吸收光谱由单个窄带组成,与宽的、振动结构的实验光谱形成对比。(k33)(2)PD(+) 的电子吸收光谱是通过使用与用于
Bredt's rule kinetically stabilized nitrogen-centered radical cations and radicals in the 9-azabicyclo[3.3.1]nonyl system
作者:Stephen F. Nelsen、Carl R. Kessel、David J. Brien