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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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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Easy and Effective Method for α-CD:N2O Host-Guest Complex Formation.

Tsveta P Sarafska1, Maya I Spassova1, Todor M Dudev1

  • 1Faculty of Chemistry and Pharmacy, Sofia University "St. Kl. Ohridski", 1164 Sofia, Bulgaria.

International Journal of Molecular Sciences
|May 25, 2024
PubMed
Summary
This summary is machine-generated.

Alpha-cyclodextrin (α-CD) can form host-guest complexes with nitrous oxide (N₂O) via a solid-gas reaction. This method achieves higher N₂O storage capacity compared to traditional crystallization techniques.

Keywords:
alpha cyclodextrininclusion complexnitrous oxidestability

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Cyclodextrins (CDs) are known for their ability to form inclusion complexes.
  • Nitrous oxide (N₂O) has applications in food and beverages, requiring stable storage methods.

Purpose of the Study:

  • To investigate the formation and N₂O storage capacity of alpha-cyclodextrin (α-CD):N₂O complexes.
  • To compare a novel solid-gas reaction method with traditional crystallization for N₂O inclusion.

Main Methods:

  • Solid-gas reaction: N₂O sorption into α-CD under varying pressures and temperatures.
  • Comparison with crystallization method from aqueous α-CD solutions saturated with N₂O.
  • Analysis of N₂O binding modes and complex stability.

Main Results:

  • Maximum N₂O storage capacity of 4.5 wt.% achieved via gas phase charging.
  • Storage capacity decreased to 1.3 wt.% upon storage in air at ambient conditions.
  • External coordination of N₂O to α-CD rims, involving hydrogen bonds and hydration water, was identified as the preferred binding mode.

Conclusions:

  • The solid-gas reaction offers a more efficient method for N₂O inclusion into α-CD.
  • The α-CD:N₂O complexes exhibit promising thermal stability for potential applications.
  • These findings suggest viable applications in the food and beverage industries for N₂O storage.