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関連する概念動画

Network Covalent Solids02:18

Network Covalent Solids

16.0K
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...
16.0K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

15.1K
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...
15.1K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.5K
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...
30.5K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.0K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
48.0K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.9K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.9K
Molecular Shapes01:18

Molecular Shapes

61.1K
Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
Two regions of electron density in a diatomic...
61.1K

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関連する実験動画

Updated: Jan 8, 2026

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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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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グラファイト上で共有結合性有機構造（COF）がねじれて成長する理由

Veniero Lenzi1, Karol Strutyński1, Manuel Melle-Franco2

  • 1CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal.

Nature communications
|December 13, 2025
PubMed
まとめ

研究者らは、グラファイト上でのピレンジボロン酸（PDBA）共有結合性有機構造（COF）の成長を研究した。成長条件がCOFを特定のねじれた積層構造に固定し、新規2D材料の作成に重要であることを発見した。

キーワード:
共有結合性有機構造2D材料グラファイトねじれ分子動力学シミュレーション自己組織化

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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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Last Updated: Jan 8, 2026

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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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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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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Preparation and Characterization of C60/Graphene Hybrid Nanostructures
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Preparation and Characterization of C60/Graphene Hybrid Nanostructures

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科学分野:

  • 材料科学; 2D材料; 超分子化学

背景:

  • 超伝導およびねじれエレクトロニクスデバイスにとって有望な、グラフェンおよび共有結合性有機構造（COF）を含むファンデルワールス2D材料。最近の進歩により、グラファイト上で高品質のピレンジボロン酸（PDBA）COFが可能になり、再現性のあるねじれた積層構造とモアレ超格子が実証されている。

研究 の 目的:

  • グラファイト表面上でのねじれたPDBA COFの形成を支配する基本的なプロセスを理解する。COF自己組織化におけるねじれ角と成長ダイナミクスの役割を調査する。

主な方法:

  • ほぼ密度汎関数理論（DFT）精度のハイブリッド分子力学力場を利用した。グラファイト基板上で様々なねじれ角におけるPDBA COFの成長をシミュレートした。

主要な成果:

  • PDBA COF成長中に利用可能な熱力学的最小値の数が大幅に減少し、構造が特定のねじれた積層構造に固定される。COF前駆体の表面移動度は、成長構造のサイズとねじれ角に大きく依存する。

結論:

  • 観察された固定化メカニズムと変化した表面移動度は、ねじれたPDBA COF単層の合成成功における重要な要因である。これらの発見は、調整された電子特性を持つ高度な2D材料の合理的な設計と合成のための基本的な洞察を提供する。