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Related Concept Videos

Types of Chemical Reactions: Exchange and Reversible01:08

Types of Chemical Reactions: Exchange and Reversible

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An exchange reaction is a chemical reaction in which both synthesis and decomposition occur, chemical bonds are both formed and broken, and chemical energy is absorbed, stored, and released.
A special kind of exchange reaction is the oxidation-reduction reaction, or the redox reaction. These reactions involve the transfer of electrons from one compound to another. The electrons in these reactions commonly come from hydrogen atoms, which consist of an electron and a proton. A molecule gives up a...
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Energy Transfer in Chemical Reactions

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Chemical reactions require sufficient energy to cause the matter to collide with enough precision and force that old chemical bonds can be broken and new ones formed. In general, kinetic energy is the form of energy powering any type of matter in motion. Imagine a person building a brick wall. The energy it takes to lift and place one brick on top of another is the kinetic energy—the energy matter possesses because of its motion. Once the wall is in place, it stores potential energy.
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Coupled Reactions

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Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
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Noncovalent Attractions in Biomolecules02:35

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Cooperative Allosteric Transitions

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Homogeneous Equilibria for Gaseous Reactions
For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. A relation between these two K values may be simply derived from the ideal gas equation and the definition of molarity. According to the ideal gas equation:
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Updated: Jun 27, 2025

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

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Switching between Nonisoenergetic Dynamic Covalent Reactions Using Host-Guest Chemistry.

Titouan Chetot1, Francesca Marocco Stuardi1, Adrien Forot1

  • 1CNRS, Université Claude Bernard Lyon 1, ICBMS UMR5246, F-69622 Villeurbanne, France.

Journal of the American Chemical Society
|April 30, 2024
PubMed
Summary
This summary is machine-generated.

This study shows how supramolecular chemistry can control CO2 capture by amines. Host-guest interactions shift the reaction equilibrium, enhancing CO2 capture efficiency and demonstrating a switch between covalent processes.

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Area of Science:

  • Supramolecular Chemistry
  • Carbon Dioxide Capture
  • Covalent Adaptable Networks

Background:

  • Carbon dioxide (CO2) reacts with amines to form carbamates and carbonates.
  • Dynamic combinatorial libraries are formed by reversible covalent reactions.
  • Cavitands like dyn[n]arenes form polyanionic macrocycles that bind polyammonium guests.

Purpose of the Study:

  • To investigate the effect of host-guest complexation on CO2 capture equilibrium by polyamines.
  • To demonstrate the switching of competitive reversible covalent reactions using supramolecular templating.
  • To enhance CO2 capture efficiency through supramolecular control.

Main Methods:

  • Utilized dyn[n]arene-based macrocycles as hosts for polyammonium guests in aqueous solutions.
  • Studied the CO2 capture equilibrium of polyamines in the presence and absence of the supramolecular host.
  • Analyzed the shift in covalent adduct formation (carbamates vs. carbonates) upon host-guest complexation.

Main Results:

  • Formation of [2]pseudorotaxanes by macrocycle-polyammonium complexation shifted the CO2 capture equilibrium.
  • The equilibrium shifted towards the formation of carbonate adducts, suppressing carbamate formation.
  • Supramolecular templating enhanced CO2 capture efficiency by increasing polyamine protonation.

Conclusions:

  • Host-guest interactions can effectively switch the outcome of competing reversible covalent reactions in CO2 capture.
  • This supramolecular approach offers a novel strategy for enhancing CO2 capture efficiency.
  • Demonstrates the interplay between noncovalent and covalent interactions, challenging traditional energy frame separation.