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Molecules 2018, 23(11), 2893; https://doi.org/10.3390/molecules23112893

Electron-Transfer Properties of Phenyleneethynylene Linkers Bound to Gold via a Self-Assembled Monolayer of Molecular Tripod

1
Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
2
Organization for the Promotion of Regional Innovation, Mie University, Tsu, Mie 514-8507, Japan
*
Author to whom correspondence should be addressed.
Received: 23 September 2018 / Revised: 20 October 2018 / Accepted: 30 October 2018 / Published: 6 November 2018
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Abstract

The three-point adsorption of tripod-shaped molecules enables the formation of robust self-assembled monolayers (SAMs) on solid surfaces, where the component molecules are fixed in a strictly upright orientation. In the present study, SAMs of a rigid molecular tripod consisting of an adamantane core and three CH2SH groups were employed to arrange ferrocene on a gold surface through oligo(p-phenyleneethynylene) linkers. Cyclic voltammetry of the monolayers demonstrated high surface coverage of ferrocene, yet the molecular interaction among adjacent ferrocene units was negligible. This was because of the extended intermolecular distance caused by the bulky tripod framework. The rates of electron transfer from the ferrocene to the gold surface through different linker lengths were determined by electrochemical measurements, from which the decay factor for oligo(p-phenyleneethynylene) wire was evaluated. View Full-Text
Keywords: molecular tripod; self-assembled monolayer; electron transfer; adamantane; ferrocene molecular tripod; self-assembled monolayer; electron transfer; adamantane; ferrocene
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kitagawa, T.; Kawano, T.; Hase, T.; Hayakawa, I.; Hirai, K.; Okazaki, T. Electron-Transfer Properties of Phenyleneethynylene Linkers Bound to Gold via a Self-Assembled Monolayer of Molecular Tripod. Molecules 2018, 23, 2893.

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