Efficient Energy Transfer in a Rylene Imide-Based Heterodimer: The Role of Intramolecular Electronic Coupling.
Shaoqian PengGuangwei ShaoKangwei WangXingyu ChenJingwen XuHuan WangDi WuJian-Long XiaPublished in: The journal of physical chemistry letters (2023)
The development of antenna molecules with simplified structures can effectively avoid the complex exciton dynamics resulting from conformational mobility. Two distinct heterodimers TP and TBP comprising a perylenediimide (PDI) donor and terrylenediimide (TDI) acting as an energy sink were investigated. Tuned by varying functionalization positions, the bay-to-bay-linked TP offers a strong chromophore coupling, while the bay-to-N-linked TBP exhibits a weak chromophore coupling. Using transient absorption spectroscopy, we found that TP underwent ultrafast vibrational relaxation (τ VR < 400 fs) from upper vibrational energy levels of the singlet states after pumping at 490 nm, and followed by electron transfer (ET, τ ET = 2.5 ps) from TDI to PDI. TBP exhibited ultrafast excitation energy transfer (EET, τ EET = 0.48 ± 0.1 ps) from the excited PDI donor to TDI acceptor, and the subsequent charge transfer (CT) process was almost quenched. This result provides insight into designing novel small molecules capable of efficient energy transfer.
Keyphrases
- energy transfer
- electron transfer
- single molecule
- quantum dots
- room temperature
- high resolution
- water quality
- computed tomography
- ionic liquid
- molecular dynamics simulations
- atomic force microscopy
- photodynamic therapy
- molecular dynamics
- dual energy
- cerebral ischemia
- contrast enhanced
- virtual reality
- blood brain barrier
- density functional theory
- magnetic resonance
- pet ct