Synthesis, Structures, Optical, and Electrochemical Properties of Bis-Cyclometallated Iridium(III) Complexes with N-Benzylbenzimidazoles

D. Е. Smirnov; Смирнов Д. Е.; S. V. Tatarin; Татарин С. В.; M. A. Kiseleva; Киселева М. А.; I. V. Taydakov; Тайдаков И. В.; M. T. Metlin; Метлин М. Т.; S. I. Bezzubov; Беззубов С. И.

doi:10.31857/S0044457X23601049

Synthesis, Structures, Optical, and Electrochemical Properties of Bis-Cyclometallated Iridium(III) Complexes with N-Benzylbenzimidazoles

Authors: Smirnov D.Е.¹, Tatarin S.V.¹, Kiseleva M.A.¹^,2, Taydakov I.V.³^,4, Metlin M.T.³, Bezzubov S.I.¹
Affiliations:
1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences
2. Moscow State University
3. P.N. Lebedev Physical Institute, Russian Academy of Sciences
4. N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences
Issue: Vol 68, No 9 (2023)
Pages: 1202-1210
Section: КООРДИНАЦИОННЫЕ СОЕДИНЕНИЯ
URL: https://rjonco.com/0044-457X/article/view/666224
DOI: https://doi.org/10.31857/S0044457X23601049
EDN: https://elibrary.ru/YFVIQG
ID: 666224

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Abstract

A series of bis-cyclometallated iridium(III) complexes with various 2-aryl-1-benzylbenzimidazoles (aryl is 4-chlorophenyl, 4-tert-butylphenyl, 3,4-dimethoxyphenyl) and 4,4'-dicarboxy-2,2'-bipyridine have been prepared. The synthesized complexes have been studied by 1H NMR spectroscopy, high-resolution mass spectrometry, X-ray diffraction analysis, spectrophotometry, luminescent spectroscopy, and cyclic voltammetry. In the electronic spectra of the complexes, the absorption bands show a noticeable bathochromic shift with an increase in the electron-donating properties of the benzimidazole ligand. In solution, the complexes exhibit photoluminescence in the yellow–red region of the spectrum with a quantum yield in the range of 0.4–7.7% and an excited state lifetime in the range of 71–408 ns. According to cyclic voltammetry data, quasi-reversible redox transitions are observed in solutions of the studied complexes (Eox = 1.16–1.57 V vs. SHE, acetonitrile).

Keywords

X-ray diffraction analysis, luminescence, electronic spectra

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