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Related Concept Videos

Conformations of Cyclohexane02:11

Conformations of Cyclohexane

14.7K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
14.7K
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

17.4K
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...
17.4K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.5K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.5K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

5.5K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
5.5K
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

10.9K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
10.9K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.3K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.3K

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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Highly Robust Tetranuclear Cobalt-Based 3D Framework for Efficient C2H2/CO2 and C2H2/C2H4Separations.

Junying Zhao1, Qian Li1, Xin-Cheng Zhu2

  • 1State Key Laboratory Base of Novel Functional Materials and Preparation Science, School of Materials Science & Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China.

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Summary

A novel cobalt-based metal-organic framework, NbU-10, demonstrates remarkable stability and high acetylene selectivity for gas separation, despite lacking open metal sites. This material shows promise for industrial applications.

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Area of Science:

  • Materials Chemistry
  • Coordination Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are porous materials with tunable properties.
  • Developing stable MOFs for gas separation is crucial for industrial applications.
  • Cobalt-based MOFs offer unique magnetic and structural characteristics.

Purpose of the Study:

  • To synthesize and characterize a novel tetranuclear cobalt(II)-based MOF, NbU-10.
  • To investigate the stability and gas adsorption properties of NbU-10.
  • To explore the potential of NbU-10 for selective acetylene separation.

Main Methods:

  • Hydrothermal synthesis method.
  • Powder X-ray diffraction and single-crystal X-ray diffraction for structural analysis.
  • Thermogravimetric analysis (TGA) for thermal stability.
  • Magnetic susceptibility measurements.
  • Gas adsorption and breakthrough experiments.
  • Density functional theory (DFT) calculations.

Main Results:

  • A novel noninterpenetrated tetranuclear cobalt(II)-based MOF, NbU-10·S, was successfully synthesized.
  • NbU-10·S exhibits high thermal stability and stability in aqueous solutions across a wide pH range (4-13).
  • Magnetic studies indicate dominant antiferromagnetic properties in the tetranuclear cobalt(II) units.
  • NbU-10 demonstrates high C2H2/CO2 and C2H2/C2H4 selectivity in gas separation experiments, despite the absence of Lewis basic functional sites and open metal sites.
  • DFT calculations provided insights into the adsorption mechanisms of different gas molecules.

Conclusions:

  • NbU-10·S is a robust and stable cobalt-based MOF with potential for selective acetylene separation.
  • The material's unique structure and properties enable efficient gas selectivity without relying on traditional open metal sites.
  • Further research can explore modifications of NbU-10 for enhanced gas separation performance.