Volume 57, Issue 51 pp. 16698-16702
Communication

Vertical Step-Growth Polymerization Driven by Electrochemical Stimuli from an Electrode

Jian Zhang

Jian Zhang

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry (CIAC), Changchun, 130022 China

University of the Chinese Academy of Sciences, Beijing, 100049 China

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Jia Du

Jia Du

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry (CIAC), Changchun, 130022 China

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Jinxin Wang

Jinxin Wang

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry (CIAC), Changchun, 130022 China

University of Science and Technology of China, Hefei, 230026 China

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Yanfang Wang

Yanfang Wang

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry (CIAC), Changchun, 130022 China

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Chang Wei

Chang Wei

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry (CIAC), Changchun, 130022 China

University of Science and Technology of China, Hefei, 230026 China

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Prof. Dr. Mao Li

Corresponding Author

Prof. Dr. Mao Li

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry (CIAC), Changchun, 130022 China

University of the Chinese Academy of Sciences, Beijing, 100049 China

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First published: 08 October 2018
Citations: 19

Graphical Abstract

A step up: Vertical step-growth polymerization of a monomer A-B through individual A–A and B–B coupling reactions driven by electrochemically positive and negative bias on a self-assembled A or B electrode enabled the sequence- and topology-controlled synthesis of molecular wires with single-molecule precision (see picture). The resulting surface-confined molecular wires showed fast electron transfer and excellent electrocatalytic performance.

Abstract

We present herein the vertical step-growth polymerization of a monomer A-B through individual A–A or B–B coupling driven by electrochemical switching of positive and negative bias on a self-assembled A or B electrode. The monomer RuII(bda)AB (bda=2,2′-bipyridine-6,6′-dicarboxylate), in which A and B are pyridine moieties with pendant carbazolyl and vinyl groups, could be dimerized at oxidative (ca. 1.0 V vs. Ag/Ag+) or reductive potential (ca. −1.8 V) to give a self-assembled RuII(bda)PA or RuII(bda)PB monolayer (P=pyridine with a pendant phosphonic acid) on ITO glass. This polymerization enabled the sequence- and topology-controlled synthesis of surface-confined molecular wires with single-molecule precision on an electrode. The electrocatalytic performance of the vertically orientated molecular wires for water oxidation increased with increasing molecular length and exceeded that of both the self-assembled monolayer and a randomly electropolymerized film, which have previously been studied as typical models.

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