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関連する概念動画

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.1K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.1K
Network Covalent Solids02:18

Network Covalent Solids

13.5K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.5K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

847
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
847
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

12.5K
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...
12.5K
Molecular Models02:00

Molecular Models

38.4K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
38.4K
Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

3.7K
The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
3.7K

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関連する実験動画

Updated: Jul 7, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

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リフレキシビリティ・オン・デマンド:多変量3D共性有機フレームワーク

Meng Wang1, Tengwu Zeng2, Yi Yu1

  • 1School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.

Journal of the American Chemical Society
|December 28, 2023
PubMed
まとめ

研究者らは,多変量 (MTV) 協和有機フレームワーク (COF) を合成する新しい方法を開発した. この突破は,ダイナミックなCOFで調節可能な柔軟性と強化されたガス分離性能を可能にします.

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Interactive Molecular Model Assembly with 3D Printing
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Interactive Molecular Model Assembly with 3D Printing

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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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3.6K

関連する実験動画

Last Updated: Jul 7, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

13.4K
Interactive Molecular Model Assembly with 3D Printing
06:15

Interactive Molecular Model Assembly with 3D Printing

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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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科学分野:

  • 材料科学
  • 化学について
  • ナノテクノロジー

背景:

  • ダイナミック3D共性有機フレームワーク (dynaCOFs) は,ゲスト吸収による構造変化を示す.
  • 多変量 (MTV) 戦略は,調整可能な柔軟性を提供しますが,リンク器の反応性の違いのために合成的な課題に直面し,しばしば相分離を引き起こします.

研究 の 目的:

  • 3D MTV-COFのための一般的な合成プロトコルを開発する.
  • 多様な機能を持つMTV-COFを合成する際の相分離問題を克服する.
  • ガス分離におけるこれらのMTV-COFの適用を実証する.

主な方法:

  • テトラエドール単位と8つのディトピックストラットを使用して,15の結晶とフェーズ純粋のMTV-COF-300イソ構造を合成した.
  • 混合溶媒システム (極性アプロティックと非極性) を使って,リンク器の反応性をバランスさせ,制御された結晶化のための溶解性を向上させる.
  • リンカー反応性と物質結晶化に対する電子提供群と電子取り除く群の影響を調査した.

主要な成果:

  • リンカー反応と溶媒の極性を 慎重にバランスをとって 3D MTV-COFを合成した.
  • 特定の溶媒の混合物により,結晶化に不可欠なオリゴマーの溶解性と適度な反応運動性が向上することが示された.
  • 合成されたMTV-COFを使用して,調節可能なガスダイナミック行動とベンゼンとサイクロヘクサンの効率的な分離を展示した.

結論:

  • 3D MTV-COFのための一般的な合成プロトコルが確立され,以前の制限を克服しました.
  • 合成されたMTV-COFは,特定のアプリケーションのためのダイナミックなシナジズムを可能にする,オンデマンドの柔軟性を示す.
  • これらの多変量フレームワークは,統合された機能の可能性を強調し,ガス分離における単一機能の対比を上回ります.