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Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration02:40

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Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.       
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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Acid-Catalyzed Hydration of Alkenes02:45

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Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Stabilizing MXene by Hydration Chemistry in Aqueous Solution.

Xingyu Wang1, Zhiyu Wang1, Jieshan Qiu2

  • 1State Key Lab of Fine Chemicals, Liaoning Key Lab for Energy Materials and Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China.

Angewandte Chemie (International Ed. in English)
|November 3, 2021
PubMed
Summary

Researchers developed a sustainable method for long-term storage of MXenes (a type of 2D material) in water using inorganic salts. This approach prevents degradation, extending MXene shelf life to 400 days while enabling salt recycling.

Keywords:
MXenehydration chemistryinorganic saltsstabilitywater activity

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • MXenes are promising 2D materials with broad applications.
  • MXenes degrade rapidly in aqueous solutions due to dissolved oxygen and water.
  • This degradation limits their storage, application, and fundamental study.

Purpose of the Study:

  • To develop a cost-effective and sustainable method for long-term MXene storage in aqueous solutions.
  • To prevent MXene degradation by dissolved oxygen and water.
  • To maintain MXene's intrinsic properties during storage.

Main Methods:

  • Utilized hydration chemistry of non-toxic inorganic salts.
  • Reduced water activity and dissolved oxygen concentration in saline solutions.
  • Investigated MXene stability and properties over extended storage periods.

Main Results:

  • Achieved long-term storage of MXenes for up to 400 days at ambient conditions.
  • Preserved intrinsic surface chemistry and bulk carrier properties of MXenes.
  • Demonstrated over 90% recyclability of the salt protectant through simple evaporation.

Conclusions:

  • Developed a commercially viable, cost-effective, and environmentally sustainable approach for MXene storage.
  • Significantly extended MXene shelf life in aqueous solutions.
  • Minimized waste discharge and processing costs, offering a green solution for MXene preservation.