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<p>In the modern era, excess carbon dioxide and radioiodine have entered the environment as a byproduct of energy production. Therefore, designing a multifunctional compound that serves as both a porous adsorbent and a highly effective catalyst would be an interesting approach. This work involves the synthesis and characterization of a novel hydrazone-type Schiff base ligand 4-hydroxy-3-{[2-(pyridine-4-carbonyl)hydrazinylidene]methyl}benzoic acid (H<sub>2</sub>L), which is identified as two pseudopolymorphs (H<sub>2</sub>L<sup>water</sup>) and (H<sub>2</sub>L<sup>MeOH</sup>) that differ in their crystal structures and similar molecular structures. In the following, {[Co(L)(H₂O)]·2CH₃OH·H₂O}ₙ, named as a Co-SBH, has been synthesized and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), powder X-ray diffraction (XRD), elemental analysis, electronic absorption spectroscopy, EDX, SEM, and Brunauer–Emmett–Teller (BET). Its catalytic activity in synthesizing cyclic carbonate and capturing radioiodine in both solution and vapor phases as an adsorbent has been investigated. The optimal conditions were identified for each application. The cycloaddition reaction was conducted with a minimal amount of catalyst and cocatalyst under mild conditions (at 60&#xa0;°C and 1&#xa0;atm of CO<sub>2</sub> pressure) with a 100% yield. Reusability was evaluated over five consecutive cycles, with no degradation in performance observed. The capture of radioiodine showed adsorption capacity of about 966 and 98&#xa0;mg/g in the vapor and solution phases, respectively. The results indicate a microporous structure in the synthesized complex, along with active sites for both catalytic and adsorption purposes.</p>

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Synthesis of a dual-functional hydrazone-based cobalt complex as a catalyst for the cycloaddition of CO2 and radioactive iodine capture

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月29日

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  • Hossein Ghaffari-Laleh,
  • Seyed Abolfazl Hosseini-Yazdi,
  • Michal Dušek,
  • Morgane Poupon,
  • Cinthia Antunes Corrêa

摘要

In the modern era, excess carbon dioxide and radioiodine have entered the environment as a byproduct of energy production. Therefore, designing a multifunctional compound that serves as both a porous adsorbent and a highly effective catalyst would be an interesting approach. This work involves the synthesis and characterization of a novel hydrazone-type Schiff base ligand 4-hydroxy-3-{[2-(pyridine-4-carbonyl)hydrazinylidene]methyl}benzoic acid (H2L), which is identified as two pseudopolymorphs (H2Lwater) and (H2LMeOH) that differ in their crystal structures and similar molecular structures. In the following, {[Co(L)(H₂O)]·2CH₃OH·H₂O}ₙ, named as a Co-SBH, has been synthesized and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), powder X-ray diffraction (XRD), elemental analysis, electronic absorption spectroscopy, EDX, SEM, and Brunauer–Emmett–Teller (BET). Its catalytic activity in synthesizing cyclic carbonate and capturing radioiodine in both solution and vapor phases as an adsorbent has been investigated. The optimal conditions were identified for each application. The cycloaddition reaction was conducted with a minimal amount of catalyst and cocatalyst under mild conditions (at 60 °C and 1 atm of CO2 pressure) with a 100% yield. Reusability was evaluated over five consecutive cycles, with no degradation in performance observed. The capture of radioiodine showed adsorption capacity of about 966 and 98 mg/g in the vapor and solution phases, respectively. The results indicate a microporous structure in the synthesized complex, along with active sites for both catalytic and adsorption purposes.