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10.3390/molecules26144267
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Article

Ultralong π-Conjugated Bis(terpyridine)metal Polymer Wires Covalently Bound to a Carbon Electrode: Fast Redox Conduction and Redox Diode Characteristics

by
Kuo-Hui Wu
1,2,*,
Ryota Sakamoto
1,3,
Hiroaki Maeda
1,4,
Eunice Jia Han Phua
1 and
Hiroshi Nishihara
1,4,*
1
Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
2
Department of Chemistry, National Central University, 300 Jung-Da Rd. Jhong-Li 32001, Taiwan
3
Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
4
Research Center for Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan
*
Authors to whom correspondence should be addressed.
Molecules 2021, 26(14), 4267; https://doi.org/10.3390/molecules26144267
Submission received: 16 June 2021 / Revised: 8 July 2021 / Accepted: 8 July 2021 / Published: 14 July 2021
(This article belongs to the Special Issue New Electro- and Photo-Functional Materials Based on Transition Metals)
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Abstract

We developed an efficient and convenient electrochemical method to synthesize π-conjugated redox metal-complex linear polymer wires composed of azobenzene-bridged bis(terpyridine)metal (2-M, M = Fe, Ru) units covalently immobilized on glassy carbon (GC). Polymerization proceeds by electrochemical oxidation of bis(4′-(4-anilino)-2,2′:6′,2″-terpyridine)metal (1-M) in a water–acetonitrile–HClO4 solution, affording ultralong wires up to 7400 mers (corresponding to ca. 15 μm). Both 2-Fe and 2-Ru undergo reversible redox reactions, and their redox behaviors indicate remarkably fast redox conduction. Anisotropic hetero-metal-complex polymer wires with Fe and Ru centers are constructed via stepwise electropolymerization. The cyclic voltammograms of two hetero-metal-complex polymer wires, GC/[2-Fe]–[2-Ru] (3) and GC/[2-Ru]–[2-Fe] (4), show irreversible redox reactions with opposite electron transfer characteristics, indicating redox diodelike behavior. In short, the present electrochemical method is useful to synthesize polymer wire arrays and to integrate functional molecules on carbon.
Keywords: electropolymerization; coordination polymer; electron transfer; modified electrode; redox; hetero-metal complex; diode electropolymerization; coordination polymer; electron transfer; modified electrode; redox; hetero-metal complex; diode
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MDPI and ACS Style

Wu, K.-H.; Sakamoto, R.; Maeda, H.; Phua, E.J.H.; Nishihara, H. Ultralong π-Conjugated Bis(terpyridine)metal Polymer Wires Covalently Bound to a Carbon Electrode: Fast Redox Conduction and Redox Diode Characteristics. Molecules 2021, 26, 4267. https://doi.org/10.3390/molecules26144267

AMA Style

Wu K-H, Sakamoto R, Maeda H, Phua EJH, Nishihara H. Ultralong π-Conjugated Bis(terpyridine)metal Polymer Wires Covalently Bound to a Carbon Electrode: Fast Redox Conduction and Redox Diode Characteristics. Molecules. 2021; 26(14):4267. https://doi.org/10.3390/molecules26144267

Chicago/Turabian Style

Wu, Kuo-Hui, Ryota Sakamoto, Hiroaki Maeda, Eunice Jia Han Phua, and Hiroshi Nishihara. 2021. "Ultralong π-Conjugated Bis(terpyridine)metal Polymer Wires Covalently Bound to a Carbon Electrode: Fast Redox Conduction and Redox Diode Characteristics" Molecules 26, no. 14: 4267. https://doi.org/10.3390/molecules26144267

APA Style

Wu, K.-H., Sakamoto, R., Maeda, H., Phua, E. J. H., & Nishihara, H. (2021). Ultralong π-Conjugated Bis(terpyridine)metal Polymer Wires Covalently Bound to a Carbon Electrode: Fast Redox Conduction and Redox Diode Characteristics. Molecules, 26(14), 4267. https://doi.org/10.3390/molecules26144267

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