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<p>The results of a study of the photophysical properties of biligand iron(<span>iii</span>) complexes [FeL<sup>1</sup><sub>2</sub>]PF<sub>6</sub> and [FeL<sup>2</sup><sub>2</sub>]PF<sub>6</sub> with carbazole periphery of different degree of branching in various solvents including toluene, 1,4-dioxane, tetrahydrofuran (THF), ethyl acetate, dichloromethane (DCM), and <i>N</i>,<i>N</i>-dimethylformamide (DMF) are presented. Experimental data were obtained by UV—Vis spectroscopy, as well as by steady-state and time-resolved fluorescence spectroscopies. It was established that both [FeL<sup>1</sup><sub>2</sub>]PF<sub>6</sub> and [FeL<sup>2</sup><sub>2</sub>]PF<sub>6</sub> exhibit positive solvatochromic behavior. The Stokes shifts increase with solvent polarity to more than 120 nm in DCM and DMF. The degree of branching significantly influences the absolute fluorescence quantum yields, which were higher for [FeL<sup>2</sup><sub>2</sub>]PF<sub>6</sub>. Both compounds demonstrated the ability to generate singlet oxygen (<sup>1</sup>O<sub>2</sub>).</p>

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Photophysical characteristics of azomethine iron(iii) complexes with carbazole periphery of different degree of branching

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • N. G. Bichan,
  • U. V. Chervonova,
  • M. S. Gruzdev

摘要

The results of a study of the photophysical properties of biligand iron(iii) complexes [FeL12]PF6 and [FeL22]PF6 with carbazole periphery of different degree of branching in various solvents including toluene, 1,4-dioxane, tetrahydrofuran (THF), ethyl acetate, dichloromethane (DCM), and N,N-dimethylformamide (DMF) are presented. Experimental data were obtained by UV—Vis spectroscopy, as well as by steady-state and time-resolved fluorescence spectroscopies. It was established that both [FeL12]PF6 and [FeL22]PF6 exhibit positive solvatochromic behavior. The Stokes shifts increase with solvent polarity to more than 120 nm in DCM and DMF. The degree of branching significantly influences the absolute fluorescence quantum yields, which were higher for [FeL22]PF6. Both compounds demonstrated the ability to generate singlet oxygen (1O2).