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<p>Porous organic cages (POCs) with reversible post-synthetic modification (PSM) capabilities hold great promise for the development of stimuli-responsive materials. Herein, a reversible redox PSM process was established between the imidazoline-based organic cage <b>1</b> and the imidazolium iodide cage <b>2</b>, mediated by I<sub>2</sub> oxidation and NaBH<sub>4</sub> reduction, respectively. Due to the redox active site and multiple non-covalent interaction sites, cage <b>1</b> delivers a high iodine vapor adsorption capacity of 4.71 g g<sup>−1</sup>, which is 1.35 times higher than that of a similar organic cage without imidazoline units. Moreover, cage <b>1</b> also demonstrates rapid iodine capture in solution (99% removal within 1 min) and good recyclability. This work pioneers reversible PSM in POCs and provides a strategic design for efficient, stimuli-responsive iodine adsorbents.</p>

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Reversible post-synthetic modification of an imidazoline organic cage for improved iodine adsorption performance

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Shu-Hua Zhong,
  • Na Yin,
  • Yang-Min Lin,
  • Yu-Mei Wang,
  • Xu Chen,
  • Mo Xie,
  • Qiang Gao,
  • Guo-Hong Ning,
  • Dan Li

摘要

Porous organic cages (POCs) with reversible post-synthetic modification (PSM) capabilities hold great promise for the development of stimuli-responsive materials. Herein, a reversible redox PSM process was established between the imidazoline-based organic cage 1 and the imidazolium iodide cage 2, mediated by I2 oxidation and NaBH4 reduction, respectively. Due to the redox active site and multiple non-covalent interaction sites, cage 1 delivers a high iodine vapor adsorption capacity of 4.71 g g−1, which is 1.35 times higher than that of a similar organic cage without imidazoline units. Moreover, cage 1 also demonstrates rapid iodine capture in solution (99% removal within 1 min) and good recyclability. This work pioneers reversible PSM in POCs and provides a strategic design for efficient, stimuli-responsive iodine adsorbents.