Gwebu, Sandile, Marshall, David, Sonar, Prashant, Philippa, Bronson, and Vamvounis, George (2024) Structure–Property Relationships of Solution‐Processable Diarylethene‐Based Main‐Chain Photochromic Polymers. Macromolecular Chemistry and Physics. 2300161. (In Press)

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Abstract

A series of alternating copolymers of a dithienylethene with di-n-alkyl-fluorene (P1–P3), di-n-hexylphenylene (P4), 9-heptadecanylcarbazole (P5), and 4,8-bis(3,5-dioctyl-2-thienyl)-1,5-dithia-s-indacene (P6) are designed, synthesized, and characterized. All of the polymers are soluble in common organic solvents such as chloroform, dichloromethane, toluene, and tetrahydrofuran. The side-chain length affected the solubility of the polymer, molecular weight, and the glass transition temperature. Solutions of P1–P6 show photochromism with high quantum yields of 6-π electrocyclization (41–87%) and cycloreversion (0.4–1.1%). These polymers also formed uniform thin films and the rates of solid state photoisomerization are measured relative to P4, which has the highest cyclization and cycloreversion rates. The color of the photochromic polymer is tuned according to the comonomer and the maximum absorption wavelength ranged from 569 to 675 nm in the closed isomeric form. All the polymers are thermally stable and show no signs of photodegradation after being exposed to UV-light for 120 min in air. Based on these promising results, these polymers may be useful for multifunctional organic electronic devices.

Item ID:	82552
Item Type:	Article (Research - C1)
ISSN:	1521-3935
Keywords:	diarylethenes, organic electronics, photochromes, polymers
Copyright Information:	© 2024 The Authors. Macromolecular Chemistry and Physics published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Funders:	Australian Research Council (ARC)
Projects and Grants:	ARC DP1095404, ARC DP210103006, ARC DP210102192
Date Deposited:	02 May 2024 02:04
FoR Codes:	34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340302 Macromolecular materials @ 100%
SEO Codes:	24 MANUFACTURING > 2409 Industrial chemicals and related products > 240904 Fine chemicals @ 100%
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