Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Catalysis

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.

Rotation of Asymmetric Top

Rotation of Asymmetric Top

By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...

Asymmetric Lipid Bilayer

Asymmetric Lipid Bilayer

Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...

Introduction to Mechanisms of Enzyme Catalysis

Introduction to Mechanisms of Enzyme Catalysis

For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Limitations in Determining Oxidation States in Condensed Matter at the Subnanometric Scale.

Journal of the American Chemical Society·2025

Same author

The Interaction of Sub-Monolayer Ta Adatoms and Clusters with Oxygen at the Pt(111) Interface.

The journal of physical chemistry. C, Nanomaterials and interfaces·2025

Same author

Polyethylenimine-Conjugated Au-NPs as an Efficient Vehicle for in vitro and in vivo DNA Vaccine Delivery.

International journal of nanomedicine·2025

Same author

Unlocking the hidden dimension: power of chirality in scientific exploration.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences·2024

Same author

Negative Nonlinear CD-ee Dependence in Polycrystalline BINOL Thin Films.

Journal of the American Chemical Society·2023

Same author

Bright circularly polarized photoluminescence in chiral layered hybrid lead-halide perovskites.

Science advances·2023

Search research articles

Related Experiment Video

Updated: Jan 22, 2026

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

Published on: July 23, 2016

Spectroscopy for model heterogeneous asymmetric catalysis.

Aras Kartouzian¹

¹Lehrstuhl für physikalische Chemie, Catalysis Research Center, Technische Universität München, Garching bei München, Germany.

|July 19, 2019

Summary

This summary is machine-generated.

Chiroptical spectroscopy enables detailed studies of heterogeneous asymmetric catalysis. These methods probe catalysts and products, overcoming challenges posed by enantiomers in model systems.

Keywords:

circular dichroism resonance enhanced multiphoton ionization mass spectrometry (CD-REMPI-MS)enantioselctive laser desorption heterogeneous asymmetric catalysis/catalyst (HeAC)second harmonic generation circular dichroism (SHG-CD)

More Related Videos

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion

Published on: January 15, 2016

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

Related Experiment Videos

Last Updated: Jan 22, 2026

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

Published on: July 23, 2016

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion

Published on: January 15, 2016

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

Area of Science:

Catalysis and Spectroscopic Analysis
Asymmetric Synthesis
Surface Science

Background:

Model systems are crucial for understanding heterogeneous catalysis.
Asymmetric reactions present unique challenges due to enantiomers' identical properties.
Investigating heterogeneous asymmetric catalysis requires multi-stage analysis.

Purpose of the Study:

To highlight the utility of chiroptical spectroscopy in heterogeneous asymmetric catalysis.
To demonstrate methods for probing catalysts and products in asymmetric reactions.
To address the challenges of studying enantioselective heterogeneous systems.

Main Methods:

Application of chiroptical spectroscopic techniques.
In-situ and ex-situ catalyst characterization.
Analysis of reaction products for enantiomeric excess determination.

Main Results:

Chiroptical methods effectively probe catalysts before, during, and after reactions.
Spectroscopic analysis provides insights into enantioselective processes.
Successful evaluation of enantiomeric excess achieved in heterogeneous asymmetric catalysis.

Conclusions:

Chiroptical spectroscopy is a powerful tool for investigating model heterogeneous asymmetric catalysis.
These methods overcome limitations in studying enantiomers.
Comprehensive analysis using chiroptical techniques is essential for advancing the field.