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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Updated: Aug 19, 2025

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CO2 Fixation and PCHC Depolymerization by a Dinuclear β-Diketiminato Zinc Complex.

Xi Liao1, Jiang-Hua He1, Yue-Tao Zhang1

  • 1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, Jilin, P.R. China.

Chemistry, an Asian Journal
|December 5, 2022
PubMed
Summary

This study introduces a zinc complex for efficient carbon dioxide (CO2) fixation into cyclic carbonates and plastic recycling. The catalyst facilitates CO2 cycloaddition and depolymerizes polycarbonates, showcasing dual applications in sustainability.

Keywords:
CO2 fixationconfigurational inversioncycloaddtiondepolymerizationsustainable chemistry

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Area of Science:

  • Catalysis
  • Polymer Chemistry
  • Green Chemistry

Background:

  • Carbon dioxide (CO2) utilization is crucial for mitigating climate change.
  • Chemical recycling of polycarbonates is essential for sustainable plastic management.
  • Developing efficient catalysts for CO2 fixation and polymer degradation is a key research area.

Purpose of the Study:

  • To develop a catalyst for selective CO2 fixation with epoxides.
  • To investigate the catalyst's ability for chemical recycling of polycarbonates.
  • To explore the transformation of recycled products for further applications.

Main Methods:

  • Synthesis of a dinuclear β-diketiminato (BDI) methyl zinc complex ((BDI-ZnMe)2).
  • Catalytic cycloaddition of CO2 to meso-epoxides.
  • Catalytic depolymerization of poly(cyclohexene carbonate) (PCHC).
  • Isomerization of trans-cyclohexene carbonate (trans-CHC) to cis-cyclohexene carbonate (cis-CHC).

Main Results:

  • The BDI-zinc complex selectively produced cyclic carbonates from CO2 and epoxides.
  • The complex effectively depolymerized PCHC into trans-CHC.
  • Trans-CHC was further isomerized to cis-CHC, demonstrating a complete recycling pathway.

Conclusions:

  • The reported dinuclear BDI-zinc complex is a versatile catalyst for both CO2 fixation and chemical recycling of plastics.
  • This strategy offers a sustainable approach to CO2 utilization and plastic waste management.
  • The findings highlight significant potential for industrial applications in green chemistry.