准分子
光激发
激发态
放松(心理学)
皮秒
超快激光光谱学
二聚体
化学
光化学
共价键
光谱学
化学物理
分子物理学
荧光
原子物理学
心理学
社会心理学
物理
有机化学
光学
激光器
量子力学
作者
Rui Jing,Yang Li,Keita Tajima,Yan Wan,Norihito Fukui,Hiroshi Shinokubo,Zhuoran Kuang,Andong Xia
标识
DOI:10.1021/acs.jpclett.3c03337
摘要
Strongly coupled excimer formation from interchromophoric charge transfer driven by the ultrafast excited-state structural dynamics of a 5,5′-linked 4-amino-1,8-naphthalimide covalent homodimer was investigated by ultrafast transient spectroscopy and chemical calculations. Theoretical calculations indicate that the structural relaxation associated with the dihedral motion leads to significantly enhanced interchromophoric charge transfer (CT) coupling, which favors the formation of an excimer-like symmetry-broken CT state. The formation and relaxation dynamics of the excimer state in the dimer are identified via ultrafast transient absorption and fluorescence spectroscopy. The structural relaxation following the photoexcitation occurs in tens of picoseconds and stabilizes the dimer to the strongly coupled excimer state. The highly polar solvents further stabilize the excimer state and enhance the CT character, which enable efficient electron and excitation energy transport in covalent molecular aggregates.
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