Investigations on Magnetic Field Effects in Carotenoid-Porphyrin-Fullerene Triads

如果化学反应通过自由基对进行，则磁场会影响产物的产率和化学反应的动力学。拟议调查的目的是确定控制这种磁场效应的强度和方向性的因素。为了获得这一认识，用几种实验和理论方法研究了一些不同的胡萝卜素-卟啉-富勒烯三元化合物，并分析了它们对磁场响应的差异。所用的实验方法包括瞬变吸收光谱以及强场和弱场中不同的含时电子顺磁共振实验。这些都得到了基于时间无关和依赖于时间的密度泛函理论的计算的补充。这些结果有助于设计优化的磁场传感器(磁罗盘)，并有助于了解许多动物，特别是候鸟的磁场感应能力的起源。

The product yields and kinetics of chemical reactions can be influenced by magnetic fields if the reactions proceed via radical pairs. The goal of the proposed investigations is to determine the factors governing the strength and directionality of such magnetic field effects. To gain this insight, a number of different carotene-porphyrin-fullerene triads are investigated with several experimental and theoretical methods and the differences in response to magnetic fields analysed. The used experimental methods include transient absorption spectroscopy as well as different time dependent electron paramagnetic resonance experiments in weak and strong fields. These are complemented by time independent and time dependent density functional theory based calculations. The results could help in designing an optimised magnetic field sensor (magnetic compass) and help understanding the origin of the magnetic field sensing ability of many animals, specifically of migratory birds.