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Dual‐Responsive Molecular Switches Based on Dithienylethene–Ru II Organometallics in Self‐Assembled Monolayers Operating at Low Voltage
Author(s) -
Mulas Andrea,
He Xiaoyan,
Hervault YvesMarie,
Norel Lucie,
Rigaut Stéphane,
Lagrost Corinne
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201701903
Subject(s) - bimetallic strip , electrochemistry , monolayer , chemistry , redox , photochemistry , ruthenium , self assembled monolayer , molecular switch , electron transfer , electrode , catalysis , molecule , inorganic chemistry , organic chemistry , biochemistry
Two carbon‐rich ruthenium complexes bearing a dithienylethene (DTE) unit and a hexylthiol spacer were designed to be attached on gold surfaces. Both compounds display photochemically driven switching properties, allowing reversible conversion from open to closed forms of the DTE units upon irradiation in solution. In contrast, only the bimetallic complex undergoes an efficient electrochemical ring closure at low potential, (0.5 V vs. SCE), whereas the monometallic complex shows a simple one‐electron reversible redox event. These appealing switching properties could be successfully transferred within diluted self‐assembled monolayers (SAMs). Furthermore, the two immobilized organometallics exhibit fast electron‐transfer kinetics. Therefore, this organometallic strategy allows us to obtain multifunctional surfaces with the possibility of combining switching events triggered by an electrochemical oxidation at low potential and by light at distinct wavelengths for a write‐and‐erase function, along with an access to different oxidation states. Importantly, a non‐destructive electrochemical read‐out is achieved at a sufficiently high scan rate that prevents any electrochemical closing. On the whole, the two surface‐confined organometallic compounds exhibit appealing properties for application in molecular electronics.