Novel Fe(II)-Based Supramolecular Film Prepared by Interfacial Self-Assembly of an Asymmetric Polypyridine Ligand and Its Electrochromic Performance
An asymmetric two-arm polypyridine ligand 4′-{4-[4-(2,2′-dipyridyl)phenyl]}-2,2′:6′,2′-terpyridine (<b>TPY-Ph-BPY</b>) with double coordination units was synthesized using the one-step Suzuki reaction. The metallic supramolecular film was subsequently obtained by the Fe<sup>2+</...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/6/1376 |
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| Summary: | An asymmetric two-arm polypyridine ligand 4′-{4-[4-(2,2′-dipyridyl)phenyl]}-2,2′:6′,2′-terpyridine (<b>TPY-Ph-BPY</b>) with double coordination units was synthesized using the one-step Suzuki reaction. The metallic supramolecular film was subsequently obtained by the Fe<sup>2+</sup>-induced self-assembly method at the CHCl<sub>3</sub>-H<sub>2</sub>O interface, which displayed a distinct flat and continuous morphology. The supramolecular film-coated ITO electrode demonstrated a reversible electrochemical redox behavior with pronounced color changes between purple and light green. Its solid-state electrochromic device had an optical contrast (Δ<i>T</i>%) of 26.2% at λ<sub>max</sub> = 573 nm with balanced coloring (<i>t</i><sub>c</sub> = 2.4 s) and bleaching (<i>t</i><sub>b</sub> = 2.6 s) times and a high current efficiency of 507.8 cm<sup>2</sup>/C. Moreover, good cycling stability with a long-term reversible color change was observed beyond 900 cycles. These results suggested the promising potential of the <b>TPY-Ph-BPY-Fe(II)</b> supramolecular film for electrochromic applications. |
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| ISSN: | 1420-3049 |