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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

19.6K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.6K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

2.8K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
2.8K
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

12.8K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
12.8K
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

14.9K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
14.9K
[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement01:24

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

2.2K
The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
2.2K
Directing and Steric Effects in Disubstituted Benzene Derivatives01:18

Directing and Steric Effects in Disubstituted Benzene Derivatives

3.1K
When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
3.1K

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Updated: Aug 17, 2025

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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Substituent Engineering-Enabled Structural Rigidification and Performance Improvement for C2/CO2 Separation in Three

Lianglan Yue1, Xinxin Wang1, Chao Lv2

  • 1Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China.

Inorganic Chemistry
|December 12, 2022
PubMed
Summary

Researchers developed new porous materials for efficient carbon dioxide (CO2) removal from C2 hydrocarbons. Substituent engineering enhanced both CO2 uptake capacity and selectivity, improving separation performance.

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Author Spotlight: Accelerating Discovery in Microporous Material Chemistry
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Author Spotlight: Accelerating Discovery in Microporous Material Chemistry
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Author Spotlight: Accelerating Discovery in Microporous Material Chemistry

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Adsorption Science

Background:

  • Separating carbon dioxide (CO2) from C2 hydrocarbons is crucial for the chemical industry.
  • Similar physical properties of CO2 and C2 hydrocarbons make selective adsorption challenging.
  • A trade-off often exists between adsorption capacity and selectivity in porous materials.

Purpose of the Study:

  • To develop novel porous materials for selective CO2 capture from C2 hydrocarbons.
  • To investigate the impact of substituent engineering on adsorption properties.
  • To overcome the capacity-selectivity trade-off in CO2/C2 hydrocarbon separation.

Main Methods:

  • Synthesis of an isoreticular family of coordination framework compounds using dicopper paddlewheel units and functionalized 4-pyridylisophthalate ligands.
  • Systematic investigation of adsorption properties towards C2 hydrocarbons and CO2.
  • Utilized Ideal Adsorption Solution Theory (IAST), density functional theory (DFT) calculations, and column breakthrough experiments.

Main Results:

  • The synthesized coordination frameworks demonstrated promising potential for C2/CO2 separations.
  • Substituent engineering successfully enhanced both CO2 uptake capacity and adsorption selectivity simultaneously.
  • Modified frameworks exhibited improved separation performance compared to the parent compound.

Conclusions:

  • Substituent introduction on ligands mitigates framework distortion, enhancing permanent porosity for gas adsorption.
  • Polarization of the framework surface through substituents improves host-guest interactions.
  • The developed strategy offers a pathway for designing advanced materials for efficient CO2 capture and separation.