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Abstract <p>Two novel bis-cyclometalated iridium(III) complexes with 1,2‑diphenylbenzimidazole (<b>pbi</b>) and ancillary 1-methyl-2-(pyridin-2-yl)-1<i>H</i>-perimidine (L<sub>1</sub>, complex <b>1</b>) or ethyl 2-(2-(pyridin-2-yl)-1<i>H</i>-perimidin-1-yl)acetate (L<sub>2</sub>, complex <b>2</b>) were synthesized and characterized by physicochemical methods. Comparison of the results of crystal packing analysis and electronic absorption spectroscopy demonstrates that while exclusion of the rigid pyrimidine system from conjugation does not allow red-shifting of absorption maxima, both complexes exhibit broad absorption up to 600 nm (ε = 27 000–800 M <sup>–1</sup> cm <sup>–1</sup>), comparable to iridium analogs. The results of the study clarify the influence of steric factors on the absorption properties of the complexes and will be used for further development of strongly light-absorbing materials.</p>

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Synthesis, Structure, and Optical Properties of Cyclometalated Iridium(III) Complexes with 1,2‑Diphenylbenzimidazole and N-Substituted Perimidines

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • M. A. Kiseleva,
  • S. I. Bezzubov

摘要

Abstract

Two novel bis-cyclometalated iridium(III) complexes with 1,2‑diphenylbenzimidazole (pbi) and ancillary 1-methyl-2-(pyridin-2-yl)-1H-perimidine (L1, complex 1) or ethyl 2-(2-(pyridin-2-yl)-1H-perimidin-1-yl)acetate (L2, complex 2) were synthesized and characterized by physicochemical methods. Comparison of the results of crystal packing analysis and electronic absorption spectroscopy demonstrates that while exclusion of the rigid pyrimidine system from conjugation does not allow red-shifting of absorption maxima, both complexes exhibit broad absorption up to 600 nm (ε = 27 000–800 M –1 cm –1), comparable to iridium analogs. The results of the study clarify the influence of steric factors on the absorption properties of the complexes and will be used for further development of strongly light-absorbing materials.