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Related Concept Videos

Reaction Mechanisms03:06

Reaction Mechanisms

Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Chemical Ionization (CI) Mass Spectrometry01:21

Chemical Ionization (CI) Mass Spectrometry

The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
Reaction Mechanisms: Rate-limiting Step Approximation01:29

Reaction Mechanisms: Rate-limiting Step Approximation

The rate-determining step, or RDS, in a chemical reaction is the slowest step that determines the overall reaction rate. It is identified by using the observed rate law and typically involves approximation methods like the RDS approximation or the steady-state approximation.In the RDS approximation, also known as the rate-limiting-step or equilibrium approximation, the reaction mechanism consists of one or more reversible reactions near equilibrium, followed by a slower RDS, and then one or...
Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...

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Related Experiment Video

Updated: Jul 11, 2026

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

A supramolecular approach to an allosteric catalyst.

Nathan C Gianneschi1, Paul A Bertin, SonBinh T Nguyen

  • 1Department of Chemistry and the Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, IL 60201-3113, USA.

Journal of the American Chemical Society
|August 28, 2003
PubMed
Summary

This study introduces a new supramolecular allosteric catalyst. This novel catalyst system demonstrates enhanced reactivity and selectivity in asymmetric reactions compared to traditional analogues.

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Area of Science:

  • Supramolecular Chemistry
  • Catalysis
  • Organometallic Chemistry

Background:

  • Development of abiotic catalysts for asymmetric synthesis.
  • Exploration of allosteric regulation in catalytic systems.
  • Limitations of monomeric catalysts in complex reactions.

Purpose of the Study:

  • To design and synthesize a novel supramolecular allosteric catalyst.
  • To investigate the catalytic performance in asymmetric ring opening reactions.
  • To compare the efficacy of the supramolecular catalyst with a monomeric analogue.

Main Methods:

  • Weak-link approach for catalyst assembly.
  • Incorporation of Rh(I) and Cr(III) centers within a macrocyclic structure.
  • Kinetic studies and selectivity analysis of the asymmetric ring opening of cyclohexene oxide.

Main Results:

  • Successful synthesis of a supramolecular catalyst with Rh(I) and Cr(III) centers.
  • Demonstration of allosteric control through macrocyclic cavity modulation.
  • Significant rate enhancement and improved selectivity compared to Cr(III)-salen monomer.

Conclusions:

  • The novel supramolecular catalyst enables allosteric control for enhanced reactivity.
  • This work presents a new strategy for constructing abiotic allosteric catalysts.
  • The findings open avenues for designing sophisticated catalytic systems with tunable properties.