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Electropolymerization is an important technique for surface functionalization owing to its convenient and controlled synthetic pathways. The in-situ synthesis of metallo-supramolecular polymers (MSPs) utilizing coordination-driven metal ions and coordinating ligands as well as studying their potential applications using electropolymerization have been less explored. Herein, we demonstrated the formation of MSPs on a pre-terpyridine-functionalized indium tin oxide (ITO) glass substrate by using Fe(III) ions and 4′,4′′′′-(1,4-phenylene)-bis(2,2′:6′,2′′-terpyridine) ligand. By providing an anodic potential, polymer growth occurred due to the strong coordination between the reduced metal ions (Fe(II)) and the bis-terpyridine ligand. The formation of the polymer was evident from the growth of the corresponding peaks in the cyclic voltammogram and UV-vis spectral profile. The surface morphology was characterized using atomic force microscopy (AFM). The electrochromic (EC) properties of the electropolymerized MSP (EP-MSP) were studied by utilizing the metal-to-ligand charge-transfer color band of the redox-active Fe(II)-(terpyridine)2 unit present in the MSP backbone. It was observed that the film exhibited an optical switching coloring time of 2.1 s and 5.7 s for bleaching, a transmittance change of 54%, and a coloration efficiency of 142.6 cm2 C−1.

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  This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS Applied Polymer Materials, copyright © 2023 American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acsapm.3c01937.

Keyword: Electropolymerization, Metallo-supramolecular polymers, Electrochromic, Coloration efficiency, Switching time, Optical contrast

Date published: 2024-01-12

Publisher: American Chemical Society (ACS)

Journal:

• ACS Applied Polymer Materials (ISSN: 26376105) vol. 6 issue. 1 p. 441-447

Funding:

• JST-Mirai Program JPMJMI21I4
• Environmental Restoration and Conservation Agency JPMEERF20221M02

Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5044

First published URL: https://doi.org/10.1021/acsapm.3c01937

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Updated at: 2024-11-28 16:31:18 +0900

Published on MDR: 2024-11-28 16:31:18 +0900