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Metallosupramolecular polymers (MSPs) have reversible electrochromic (EC) characteristics. Transition metal ions and ditopic organic ligands are complexed 1:1 to form MSPs, but the complexation conditions depend on the metal species ions. Herein, a microwave-assisted (MWA) quick synthesis of a Ru(II)-based MSP (polyRu–MWA) as a novel preparation method for MSPs is reported. PolyRu–MWA is synthesized under microwave irritation for 60 min using 770 W and 2.45 GHz frequency, whereas a conventionally synthesized Ru(II)-based MSP (polyRu–CS) is obtained using oil-bath at 160 °C for 24 h. PolyRu–MWA is found to show much better EC properties than polyRu–CS. A film of polyRu–MWA prepared on an indium tin oxide glass exhibits higher optical contrast (transmittance change, ΔT: 81.39%) than polyRu–CS (67.73%). Coloration efficiency(CE, η) of polyRu–MWA (425.7 cm2 C−1) is also higher than that of polyRu–CS (318.3 cm2 C−1). Interestingly, the charge and discharge current ratio for bleaching and coloring in polyRu–MWA is ≈1.7 times higher than that for polyRu–CS, probably because of the high molecular weight polymer formation in polyRu–MWA. A polyRu–MWA film also displays a longer EC optical memory than polyRu–CS.

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  This is the pre-peer reviewed version of the following article: U. Rana, D. C. Santra, B. Prusti, C. Chakraborty, T. Ikeda, Y. Saito, K. Takeuchi, R. Nagahata, M. Higuchi, Microwave-Assisted Quick Synthesis of Ru(II)-Based Metallosupramolecular Polymer for Improved Electrochromic Properties. Macromol. Chem. Phys. 2024, 225, 2300381, which has been published in final form at https://doi.org/10.1002/macp.202300381. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

Keyword: metallosupramolecular polymer, microwave assisted synthesis, electrochromic property, redox, metal-to-ligand charge transfer

Date published: 2024-01-12

Publisher: Wiley

Journal:

• Macromolecular Chemistry and Physics (ISSN: 10221352) vol. 225 issue. 5 2300381

Funding:

• Japan Science and Technology Agency
• Environmental Restoration and Conservation Agency
• JST-Mirai Program JPMJMI21I4

Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5043

First published URL: https://doi.org/10.1002/macp.202300381

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Updated at: 2024-11-28 16:31:12 +0900

Published on MDR: 2024-11-28 16:31:12 +0900