Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

NMR Spectroscopy and Mass Spectrometry of Aldehydes and Ketones01:15

NMR Spectroscopy and Mass Spectrometry of Aldehydes and Ketones

4.3K
In aldehydes, the hydrogen atom connected to the carbonyl carbon helps distinguish aldehydes from other carbonyl compounds using ¹H NMR spectroscopy. The closeness of aldehydic hydrogen to the electrophilic carbonyl carbon highly deshields the hydrogen atom causing its signal to appear around 10 ppm in the ¹H NMR spectra. α hydrogens split the aldehydic proton signal, which helps identify the number of α hydrogens in the molecule. For instance, one α hydrogen creates a...
4.3K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

27.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
27.4K
Reactivity of Enolate Ions01:23

Reactivity of Enolate Ions

2.7K
Enolate ions are formed by the acid–base reaction of a carbonyl compound with a base. This leads to deprotonation of the α hydrogen atom, leading to a resonance-stabilized enolate ion where one of the contributing structures is an oxyanion, which imparts additional stability. Therefore, the proton on the α carbon is more acidic in nature than that of other sp3-hybridized C–H bonds but less acidic than those in O–H bonds where the negative charge in the conjugate...
2.7K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K

You might also read

Related Articles

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

Sort by
Same author

Mechanochemically assembled organometallic complexes: a mechanistic study.

Chemical science·2026
Same author

Gold-activated persulfate p-doping of organic semiconductors.

Nature materials·2026
Same author

Bioengineering multicellular tumor spheroids with tunable extracellular matrix deposition.

Acta biomaterialia·2026
Same author

n-doping of organic semiconductors catalysed by organometallic complexes.

Nature communications·2025
Same author

Isopotential Electron Titration: Hydrogen Adsorbate-Metal Charge Transfer.

ACS central science·2025
Same author

Silylative Amide to Nitrile Conversion Mediated by Simple Lanthanide-Organoamides: Scope and Mechanism.

Angewandte Chemie (International ed. in English)·2025

Related Experiment Video

Updated: Sep 5, 2025

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
08:18

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

Published on: March 4, 2021

1.8K

High-Field NMR, Reactivity, and DFT Modeling Reveal the γ-Al2 O3 Surface Hydroxyl Network.

Nicolas Merle1, Tarnuma Tabassum2, Susannah L Scott2

  • 1Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181, UCCS, Unité de Catalyse et Chimie du Solide, 59000, Lille, France.

Angewandte Chemie (International Ed. in English)
|July 5, 2022
PubMed
Summary

This study details hydroxyl groups on gamma-alumina (γ-Al2O3) surfaces using advanced techniques. Understanding these surface hydroxyls is key to optimizing alumina catalysts for industrial applications.

Keywords:
AluminaCatalysisDensity Functional CalculationsSolid-State NMRSurface Chemistry

More Related Videos

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
05:50

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments

Published on: May 11, 2017

11.0K
In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
11:38

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

16.1K

Related Experiment Videos

Last Updated: Sep 5, 2025

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
08:18

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

Published on: March 4, 2021

1.8K
Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
05:50

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments

Published on: May 11, 2017

11.0K
In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
11:38

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

16.1K

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Catalysis

Background:

  • Aluminas are critical industrial materials, widely used as catalyst supports and catalysts.
  • Gamma-alumina (γ-Al2O3), a transition alumina, is a preferred support material.
  • Surface properties, particularly hydroxyl groups, significantly influence γ-Al2O3 reactivity.

Purpose of the Study:

  • To qualitatively and quantitatively assess surface hydroxyl groups on γ-Al2O3.
  • To identify and characterize [AlOH] configurations at the molecular level.
  • To correlate hydroxyl structures with active site structures in catalytic alkane metathesis.

Main Methods:

  • High-field 1H and 27Al solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Infrared (IR) spectroscopy.
  • Density Functional Theory (DFT) calculations and selective reactivity studies.

Main Results:

  • Detailed molecular-level identification of principal [AlOH] configurations on γ-Al2O3 surfaces.
  • Assessment of hydroxyl group changes at three distinct dehydroxylation temperatures.
  • Establishment of structural information through combined spectroscopic and computational methods.

Conclusions:

  • The study provides unprecedented molecular-level insights into γ-Al2O3 surface hydroxyl structures.
  • Understanding these hydroxyl groups is crucial for tuning γ-Al2O3 reactivity.
  • The findings link surface hydroxyl characteristics to the active sites in alkane metathesis catalysis.