Multichromic metallopolymers of poly(2,5-dithienylpyrrole)s derived through tethering of ruthenium(II) bipiridyl complex

Nese Guven, Baris Yucel*, Hajar Sultanova, Pinar Camurlu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

In this study, 2,5-dithienylpyrrole (SNS) units were tethered to ruthenium(II) bipiridyl complexes and electrochemically polymerized to obtain a new class of electrochromic metallopolymers. The Ru-complexes were designed by altering the number of polymerizable SNS units per redox active metal center and the length of non-conjugated spacer, where the relationship between the monomer structure and optoelectronic properties of the resultant metallopolymers was investigated. Tuning of the native properties of poly(2,5-dithienylpyrrole)s (PSNS) through introduction of electrochromic Ru complex as a side chain substituent presented a viable approach where the metallopolymers revealed not only ambipolar but also vibrantly multichromic behavior displaying a wide color pallet ranging from reddish brown to orange to khaki to gray. Mechanism that derive the ambipolar/multichromic activity was disclosed by investigation of optoelectronic properties of analogous poly(2,5-dithienylpyrrole)s (PSNSs) having bipyridine functionality. It was found that number of polymerizable units in the monomers primarily influences the electrochromic properties and enhances the optical contrast and coloration efficiency of the SNS based metallopolymers. Electrochromic properties of SNS-based metallopolymers described here were further improved by introduction of EDOT units into the conjugated backbone via copolymerization. Copolymers exhibited color variation from brownish yellow to greenish yellow to green and blue with lower bandgaps and shorter switching times.

Original languageEnglish
Article number140562
JournalElectrochimica Acta
Volume424
DOIs
Publication statusPublished - 20 Aug 2022

Bibliographical note

Publisher Copyright:
© 2022

Funding

This work was financially supported by the National Science Foundation of Turkey [TUBITAK Project No: 215Z400 ] and Akdeniz University Research Funds [ FDK-2019-4934 ].

FundersFunder number
National Science Foundation of Turkey
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu215Z400
Akdeniz ÜniversitesiFDK-2019-4934

    Keywords

    • 2,5-Dithienylpyrrole
    • Ambipolar
    • Electrochromic properties
    • Metallopolymer, Ru(II) complexes

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