并五苯
共轭体系
单重态裂变
化学物理
单重态
化学
光谱学
分子
材料科学
物理
原子物理学
聚合物
激发态
三重态
物理化学
有机化学
薄膜晶体管
电极
量子力学
作者
Ashish Sharma,Stavros Athanasopoulos,Yun Li,Samuel N Sanders,Elango Kumarasamy,Luis M. Campos,Girish Lakhwani
标识
DOI:10.1021/acs.jpclett.2c02061
摘要
Interchromophoric interactions such as Coulombic coupling and exchange interactions are crucial to the functional properties of numerous π-conjugated systems. Here, we use magnetic circular dichroism (MCD) spectroscopy to investigate interchromophoric interactions in singlet fission relevant pentacene dimers. Using a simple analytical model, we outline a general relationship between the geometry of pentacene dimers and their calculated MCD response. We analyze experimental MCD spectra of different covalently bridged pentacene dimers to reveal how the molecular structure of the "bridge" affects the magnitude of through-space Coulombic and through-bond exchange interactions in the system. Our results show that through-bond interactions are significant in dimers with conjugated molecules as bridging units and these interactions promote the overall electronic coupling in the system. Our generalized approach paves the way for the application of MCD in investigating interchromophoric interactions across a range of π-conjugated systems.
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