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関連する概念動画

Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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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.
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Crystal Field Theory - Octahedral Complexes02:58

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

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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,...
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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...
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Ligand Binding and Linkage00:49

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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関連する実験動画

Updated: Jun 6, 2025

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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単結晶ダイナミック・コバルント・オーガニック・フレームワーク (Adaptive Guest Alignments)

Shan Liu1, Lei Wei1, Tengwu Zeng1

  • 1School of Physical Science and Technology, Shanghai Key Laboratory of High-Resolution Electron Microscopy, State Key Laboratory of Advanced Medical Materials and Devices, ShanghaiTech University, Shanghai 201210, China.

Journal of the American Chemical Society
|November 30, 2024
PubMed
まとめ

ダイナミックな3D共性有機フレームワーク (COF) は,分子運動による適応的ゲストインクルージョンを示します. この研究は,分子スポンジのフレームワークの柔軟性を可能にする原子レベルのダイナミクスと特定の経路を明らかにしています.

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Last Updated: Jun 6, 2025

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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科学分野:

  • 材料科学
  • クリスタルグラフィー
  • 超分子化学

背景:

  • ダイナミック3D共性有機フレームワーク (COF) は,ゲスト分子による構造変化を示します.
  • COFの柔軟性とゲストの適応の正確なメカニズムは完全に理解されていません.

研究 の 目的:

  • COF-300のダイナミクスについて 原子レベルの洞察を提供すること.
  • ダイナミックなCOFにおける形状の移動性と宿主-ゲストの適応性を解明する.

主な方法:

  • COF-300の単結晶成長は,拡散グラデントトランスミナーションプロトコルを使用しています.
  • 構造分析のための高解像度のX線微分
  • 構造変化の量的なエネルギー分析

主要な成果:

  • COF-300におけるイミン結合とフェニル単位の回転と転移のダイナミクスを観察した.
  • テレフタアルデヒドダイミンのモチーフで識別された回転角.
  • 構造的な進化の過程で 発見されたメタステーブルな中間段階.
  • フレームワークの適応が示され,様々なアライメントを持つ多様なゲスト分子に適応しています.

結論:

  • COFのコンフォーマーション運動は,任意の動きではなく,特定の分子動力学によって引き起こされます.
  • ダイナミックなCOFは,液体の構造を研究するための分子スポンジとして設計できます.
  • 観察された経路は タンパク質の折りたたみに似ており 予測可能な動的行動を示唆しています