| Abstrakt: |
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). [ABSTRACT FROM AUTHOR] |
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