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

如果化学反应是通过自由基对进行的，则磁场会影响化学反应的产率和动力学。所提议的研究的目标是确定控制这种磁场效应的强度和方向性的因素。为了获得这一见解，许多不同的胡萝卜素-卟啉-富勒烯三联体研究了几种实验和理论方法，并分析了磁场响应的差异。使用的实验方法包括瞬态吸收光谱以及弱场和强场中不同时变的电子顺磁共振实验。这些是补充时间独立和时间依赖的密度泛函理论为基础的计算。研究结果有助于设计一种优化的磁场传感器（磁罗盘），并有助于了解许多动物（特别是候鸟）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.