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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Carbon-13 (¹³C) NMR: Overview01:10

Carbon-13 (¹³C) NMR: Overview

Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...

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Related Experiment Video

Updated: Jun 3, 2026

A Synthetic Methodology for Preparing Impregnated and Grafted Amine-Based Silica Composites for Carbon Capture
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Published on: September 29, 2023

Complexity behind CO2 capture on NH2-MIL-53(Al).

Eli Stavitski1, Evgeny A Pidko, Sarah Couck

  • 1Catalysis Engineering-ChemE, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 8, 2011
PubMed
Summary

Amino-functionalized Metal-Organic Frameworks (MOFs) show high carbon dioxide (CO2) capture efficiency. This study reveals that CO2 capture in MIL-53(Al) is due to framework flexibility, not direct amine interaction, enabling rapid regeneration.

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Area of Science:

  • Materials Science
  • Chemistry
  • Chemical Engineering

Background:

  • Metal-Organic Frameworks (MOFs) are promising for carbon dioxide (CO2) capture.
  • The exact mechanisms behind the enhanced CO2 separation abilities of some MOFs remain unclear.
  • Amino-functionalized MOFs are particularly noted for their high CO2 adsorption performance.

Purpose of the Study:

  • To investigate the mechanism of CO2 capture in amino-functionalized MIL-53(Al).
  • To elucidate the role of amine functionalization in the CO2 adsorption process.
  • To understand the structure-property relationships governing CO2 capture and regeneration.

Main Methods:

  • Combined experimental and theoretical approaches were employed.
  • Spectroscopic techniques were used to analyze the material's structure and interactions.
  • Density Functional Theory (DFT) calculations were performed to model the adsorption mechanism.
  • The "breathing" behavior (framework flexibility) of the MOF was studied.

Main Results:

  • Spectroscopic and DFT studies indicated an indirect role for amine groups in CO2 capture.
  • No direct chemical bond formation between CO2 and the amine groups was observed.
  • CO2 adsorption was found to modulate the "breathing" or flexibility of the MIL-53(Al) framework.
  • The material demonstrated efficient regeneration under mild conditions.

Conclusions:

  • The high CO2 capture efficiency of amino-functionalized MIL-53(Al) is attributed to its modulated "breathing" behavior, not direct chemical interaction with CO2.
  • The absence of strong chemical bonds facilitates rapid and complete regeneration of the adsorbent.
  • These findings highlight the potential of flexible MOFs for efficient CO2 capture in systems like Pressure Swing Adsorption (PSA).