Electrochromic behavior of fac-tricarbonyl rhenium complexes

Qian-hua ZHOU, Ming-yue PAN, Qi HE, Qian TANG, Cheuk Fai Stephen CHOW, Cheng-bin GONG

Research output: Contribution to journalArticlespeer-review

Abstract

This paper aims to investigate the electrochromic properties of tricarbonyl rhenium complexes. Using 4,7-diphenylphenanthroline (L₁) and 4,7-di(4-substituted)-1,10-phenanthroline (L₂–L₅) as bidentate ligands, a series of tricarbonyl rhenium complexes, fac-Re(CO)₃(Lₓ)Cl (x = 1–5), were synthesized and characterized by infrared spectroscopy, ¹H NMR, ¹³C NMR, and high resolution mass spectrometry. Their stereochemistry was investigated by single crystal X-ray diffraction. Theoretical highest occupied molecular orbital and lowest unoccupied molecular orbital charge distributions of fac-Re(CO)₃(Lₓ)Cl were calculated by density functional theory calculations. Their electrochemical and electrochromic properties were studied by cyclic voltammetry, UV-vis spectroscopy and chronoamperometry. All fac-Re(CO)₃(Lₓ)Cl complexes underwent a quasi-reversible reduction–oxidation process and an anodic peak at 1.3 V vs. Ag/Ag⁺. Electrochromic devices based on fac-Re(CO)₃(Lₓ)Cl exhibited good electrochromic performance such as an obvious change in color from bleached yellow state to colored green state (a challenging electrochromic color), rapid response time of less than 3 s, moderate optical contrast and coloration efficiency, and good switching stability (fac-Re(CO)₃(L₂)Cl retained 95.2% of its initial optical contrast after 2400 electrochromic switching cycles). The fac-Re(CO)₃(L₂)Cl with an electron-donating group (–OCH₃) at its para-position exhibited better performance including good switching stability, a higher optical contrast and a significant change in color than the unsubstituted, –CH₃ substituted, –COOCH₃ substituted and Br-substituted analogues. Copyright © 2022 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

Original languageEnglish
Pages (from-to)1072-1079
JournalNew Journal of Chemistry
Volume46
Issue number3
Early online dateDec 2021
DOIs
Publication statusPublished - Jan 2022

Citation

Zhou, Q.-H., Pan, M.-Y., He, Q., Tang, Q., Chow, C.-F., & Gong, C.-B. (2022). Electrochromic behavior of fac-tricarbonyl rhenium complexes. New Journal of Chemistry, 46(3), 1072-1079. doi: 10.1039/D1NJ04955K

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