Chemically and Mechanically Controlled Single-Molecule Switches Using Spiropyrans.

Autor:	Walkey MC, Peiris CR; School of Molecular Science and Curtin Institute of Functional Molecules and Interfaces , Curtin University , Bentley , WA 6102 , Australia., Ciampi S; School of Molecular Science and Curtin Institute of Functional Molecules and Interfaces , Curtin University , Bentley , WA 6102 , Australia., C Aragonès A; Department of Chemistry, Faculty of Natural & Mathematical Sciences , King's College London , Britannia House, 7 Trinity Street , London SE1 1DB , United Kingdom., Domínguez-Espíndola RB; School of Molecular Science and Curtin Institute of Functional Molecules and Interfaces , Curtin University , Bentley , WA 6102 , Australia., Jago D, Pulbrook T, Skelton BW, Sobolev AN, Díez Pérez I; Department of Chemistry, Faculty of Natural & Mathematical Sciences , King's College London , Britannia House, 7 Trinity Street , London SE1 1DB , United Kingdom., Piggott MJ, Koutsantonis GA, Darwish N; School of Molecular Science and Curtin Institute of Functional Molecules and Interfaces , Curtin University , Bentley , WA 6102 , Australia.
Jazyk:	angličtina
Zdroj:	ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2019 Oct 09; Vol. 11 (40), pp. 36886-36894. Date of Electronic Publication: 2019 Sep 26.
DOI:	10.1021/acsami.9b11044
Abstrakt:	Developing molecular circuits that can function as the active components in electrical devices is an ongoing challenge in molecular electronics. It demands mechanical stability of the single-molecule circuit while simultaneously being responsive to external stimuli mimicking the operation of conventional electronic components. Here, we report single-molecule circuits based on spiropyran derivatives that respond electrically to chemical and mechanical stimuli. The merocyanine that results from the protonation/ring-opening of the spiropyran form showed single-molecule diode characteristics, with an average current rectification ratio of 5 at ±1 V, favoring the orientation where the positively charged end of the molecule is attached to the negative terminal of the circuit. Mechanical pulling of a single spiropyran molecule drives a switch to a more conducting merocyanine state. The mechanical switching is enabled by the strong Au-C covalent bonding between the molecule and the electrodes, which allows the tensile force delivered by the STM piezo to break the molecule at its spiropyran C-O bond.
Databáze:	MEDLINE
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