期刊
NATURE CHEMISTRY
卷 6, 期 10, 页码 899-905出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.2026
关键词
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资金
- Specially Promoted Research Grant (KAKENHI) [22000008]
- JST-PRESTO 'New Materials Science and Element Strategy'
- Deutsche Forschungsgemeinschaft, Excellence Cluster 'Engineering of Advanced Materials'
- Grants-in-Aid for Scientific Research [22000008] Funding Source: KAKEN
Electron transfer (ET) is a fundamental process in a wide range of biological systems, photovoltaics and molecular electronics. Therefore to understand the relationship between molecular structure and ET properties is of prime importance. For this purpose, photoinduced ET has been studied extensively using donor-bridge-acceptor molecules, in which pi-conjugated molecular wires are employed as bridges. Here, we demonstrate that carbon-bridged oligo-p-phenylenevinylene (COPV), which is both rigid and flat, shows an 840-fold increase in the ET rate compared with the equivalent flexible molecular bridges. A 120-fold rate enhancement is explained in terms of enhanced electronic coupling between the electron donor and the electron acceptor because of effective conjugation through the COPVs. The remainder of the rate enhancement is explained by inelastic electron tunnelling through COPV caused by electron-vibration coupling, unprecedented for organic molecular wires in solution at room temperature. This type of nonlinear effect demonstrates the versatility and potential practical utility of COPVs in molecular device applications.
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