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Iodometry and iodimetry are analytical methods used to determine the concentration of oxidizing or reducing agents using iodine. In iodometric titrations, the oxidizing analyte solution is usually acidified and treated with an excess of iodide ions, which generates an equivalent amount of iodine in equilibrium with triiodide. The released iodine is subsequently titrated directly against a standardized reducing agent. As the dilute iodine color becomes pale yellow, a few drops of freshly...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Related Experiment Video

Updated: Jan 12, 2026

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Cyclodextrin-threaded covalent organic polyrotaxanes with tunable solid-state emissive activity for efficient iodine

Xia Guo1, Xueling Zhou1, Qiupeng Gu1

  • 1School of Mathematics and Statistics, Weifang University Weifang Shandong PR China 736308663@qq.com.

RSC Advances
|November 5, 2025
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Summary

We developed a new covalent organic polyrotaxane (COPR) with aggregation-induced emission (AIE) properties for enhanced iodine adsorption in water. This material shows superior capacity and faster kinetics due to its unique structure.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Environmental Chemistry

Background:

  • Covalent organic polymers (COPs) are promising for adsorption but often lack aqueous dispersibility.
  • Cyclodextrins (CDs) can enhance solubility and provide specific binding sites.
  • Aggregation-induced emission (AIE) materials offer unique optical properties.

Purpose of the Study:

  • To synthesize a novel covalent organic polyrotaxane (COPR) with AIE characteristics using β-cyclodextrin (β-CD) inclusion complexes.
  • To evaluate the performance of the synthesized TPE-CD-COPR as an aqueous-phase iodine adsorbent.
  • To explore the synergistic effects contributing to enhanced adsorption capabilities.

Main Methods:

  • Rational design and synthesis of TPE-CD-COPR via Knoevenagel condensation using β-CD as building blocks.
  • Characterization of photophysical properties, including AIE and solid-state emission tuning.
  • Assessment of aqueous-phase iodine adsorption capacity, kinetics, and recyclability.

Main Results:

  • TPE-CD-COPR exhibited tunable solid-state emission and enhanced polarity.
  • Significantly improved aqueous dispersibility and iodine adsorption capacity/kinetics compared to CD-free counterparts.
  • High recyclability with 99% capacity retention after 5 cycles.

Conclusions:

  • The developed COPR platform offers a versatile approach for creating functional porous materials.
  • TPE-CD-COPR demonstrates excellent potential for environmental remediation, specifically in aqueous iodine removal.
  • The synergistic effects of β-CD threading and the polymer framework are key to enhanced performance.