Charge transfer in self-assembled monolayers of molecular conductors containing tripodal anchor and terpyridine-metal redox switching element

0542198 - ÚFCH JH 2022 RIV GB eng J - Journal Article
Nováková Lachmanová, Štěpánka - Vavrek, František - Sebechlebská, Táňa - Kolivoška, Viliam - Valášek, M. - Hromadová, Magdaléna
Charge transfer in self-assembled monolayers of molecular conductors containing tripodal anchor and terpyridine-metal redox switching element.
Electrochimica acta. Roč. 384, JUL 2021 (2021), č. článku 138302. ISSN 0013-4686. E-ISSN 1873-3859
R&D Projects: GA ČR(CZ) GA21-13458S
Grant - others:Akademie věd - GA AV ČR(CZ) L2004020020
Institutional support: RVO:61388955
Keywords : Electron transfer * Terpyridine-metal redox center * Self-assembled monolayer * Electrochemical impedance spectroscopy
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impact factor: 7.336, year: 2021
Method of publishing: Limited access

This work presents charge transfer characteristics of molecular switches based on [M(terpyridine)2]2+/3+ (M = Ru, Os) electroactive element functionalized by a tripodal thiol-based anchoring platform allowing the formation of self-assembled monolayers (SAMs). It is demonstrated that the Os-tripod compound forms more compact film with less pronounced repulsive interactions among individual [M(terpyridine)2]2+/3+ units compared to Ru-tripod compound. The electron transfer rate constants were determined from cyclic voltammograms and electrochemical impedance spectra by three independent methods. The value of 1.4 × 103 s–1 was obtained for Os-tripod SAM and 1.6 × 103 s–1 for that of Ru-tripod SAM. These values are almost one order of magnitude higher than those reported in the literature for osmium and ruthenium dipodal thiol-based anchors and more than two orders of magnitude higher than those reported for single monopodal aliphatic anchoring groups.
Permanent Link: http://hdl.handle.net/11104/0319672