Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 38, Pages 20872-20878Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106666
Keywords
acyl hydrazone bond; dynamic covalent chemistry; molecular junction; responsive molecular device; STM break-junction technique
Categories
Funding
- National Key R&D Program of China [2017YFA0204902]
- National Natural Science Foundation of China [21973079, 21933012]
- China Postdoctoral Science Foundation [2020M682082]
- Guangdong Basic and Applied Basic Research Foundation [2020A151511106]
Ask authors/readers for more resources
In this study, responsive molecular devices with acid-base and photo-thermal responses were fabricated using a single dynamic acyl hydrazone bond. The devices exhibited three well-defined molecular conductance states, with reversible switching and distinct ON/OFF ratios. Density functional theory calculations revealed that the multiple conductance states were due to the dynamic acyl hydrazone bond exchange and C=N isomerization. This work opens up new possibilities for designing tailored single-molecule electrical devices.
Responsive molecular devices are one of the core units for molecular electronics, and dynamic covalent bonds (DCBs) provide the opportunity for the fabrication of responsive molecular devices. Herein we employ a single dynamic acyl hydrazone bond to fabricate tailored molecular devices using the scanning tunneling microscopy break-junction technique (STM-BJ) and the eutectic Ga-In technique (EGaIn). We found that the single-DCB-tailored molecular devices exhibited acid-base and/or photo-thermal response with three well-defined molecular conductance states. The reversible switching has the ON/OFF ratio of approximate to 10 between each state for single-molecule junctions and approximate to 3 for the SAMs-based molecular junctions. Combined with the density functional theory calculations, we revealed that the multiple conductance states of these molecular junctions originate from the dynamic acyl hydrazone bond exchange and C=N isomerization. Our work opens the avenue towards the design of tailored single-molecule electrical devices by implanting dynamic covalent bonds in molecular architectures.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available