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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
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Complexometric Titration: Ligands00:43

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Updated: Jul 21, 2025

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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CO2 complexation with cyclodextrins.

Cecilie Høgfeldt Jessen1, Jesper Bendix1, Theis Brock Nannestad1

  • 1Department of Chemistry & Niels Bohr Institute, University of Copenhagen, 2100 København Ø, Denmark.

Beilstein Journal of Organic Chemistry
|July 27, 2023
PubMed
Summary
This summary is machine-generated.

Cyclodextrins (CDs) show promise for capturing carbon dioxide (CO2). Per-O-methyl alpha-cyclodextrin demonstrated the highest CO2 affinity among the tested cyclodextrins, offering potential for carbon capture technologies.

Keywords:
carbon dioxidecrystalscyclodextringas binding

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemistry

Background:

  • Industrial processes, power generation, and transportation release significant carbon dioxide (CO2) emissions.
  • Global warming and climate change are exacerbated by rising CO2 levels.
  • Carbon capture and storage (CCS) technologies are crucial for mitigating climate change impacts.

Purpose of the Study:

  • To investigate the binding efficiency of various cyclodextrins (CDs) as CO2 capture agents.
  • To evaluate the potential of CDs in reducing CO2 emissions.
  • To identify cyclodextrins with high CO2 affinity for practical applications.

Main Methods:

  • Investigated the binding efficiency of multiple cyclodextrins towards CO2.
  • Determined the stoichiometry of alpha-cyclodextrin with CO2 through crystal structure analysis.
  • Measured CO2 binding affinity (Kg) in water for simple and modified cyclodextrins.

Main Results:

  • The crystal structure of alpha-cyclodextrin with CO2 exhibits a 1:1 stoichiometry.
  • Several simple and modified cyclodextrins bind CO2 in water with a Kg ranging from 0.18-1.2 bar-1 (7-35 M-1).
  • Per-O-methyl alpha-cyclodextrin displayed the highest affinity for CO2 among the tested compounds.

Conclusions:

  • Cyclodextrins are effective agents for capturing carbon dioxide.
  • Modified cyclodextrins, particularly per-O-methyl alpha-cyclodextrin, show significant potential for CO2 capture applications.
  • The findings support the development of cyclodextrin-based technologies for carbon capture and climate change mitigation.