期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 143, 期 7, 页码 2886-2895出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c12664
关键词
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资金
- Northwestern University
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF) [ECCS-2025633]
- SHyNE Resource
- IIN
- Northwestern's MRSEC program [NSF DMR-1720139]
- Department of Energy, Office of Basic Energy Science [DESC0004752]
This study introduces a new electrostatic anchoring strategy that forms robust gold-molecule-gold structures and demonstrates electron injection-induced redox switching in single-molecule junctions. These mechanisms could lay the foundation for a new class of redox-activated single-molecule switches.
The charge transport in single-molecule junctions depends critically on the chemical identity of the anchor groups that are used to connect the molecular wires to the electrodes. In this research, we report a new anchoring strategy, called the electrostatic anchor, formed through the efficient Coulombic interaction between the gold electrodes and the positively charged pyridinium terminal groups. Our results show that these pyridinium groups serve as efficient electrostatic anchors forming robust gold-molecule-gold junctions. We have also observed binary switching in dicationic viologen molecular junctions, demonstrating an electron injection-induced redox switching in single-molecule junctions. We attribute the difference in low- and high-conductance states to a dicationic ground state and a radical cationic metastable state, respectively. Overall, this anchoring strategy and redox-switching mechanism could constitute the basis for a new class of redox-activated single-molecule switches.
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