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Network Covalent Solids02:18

Network Covalent Solids

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

Crystal Field Theory - Octahedral Complexes

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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...
26.2K
Metallic Solids02:37

Metallic Solids

18.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.3K
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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Valence Bond Theory02:42

Valence Bond Theory

8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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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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協和有機フレームワークにおける工学スクルーの変位

Bhausaheb Dhokale1, Kira Coe-Sessions1, Michael J Wenzel1

  • 1Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, United States.

Journal of the American Chemical Society
|September 20, 2024
PubMed
まとめ

ピクテ・スペングラー反応を用いて 新しい共性有機フレームワーク (COF) を合成しました これらのCOFは独特の螺旋変位と多層構造を示し,膜分離性能を高めます.

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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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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科学分野:

  • 材料科学
  • 有機化学
  • ナノテクノロジー

背景:

  • 協和有機フレームワーク (COF) は,様々な用途を持つ結晶性多孔ポリマーです.
  • 2D-COFの形状と構造上の欠陥を制御することは,その性能を最適化するために極めて重要です.
  • ピクテ・スペングラー反応は 複雑な有機構造を 構築する際の 汎用的な経路を提供します

研究 の 目的:

  • 新しい2D-COFの合成のためにピクテ・スペングラー反応を適用する.
  • これらのCOFの構造上の欠陥,特にスクルーの変位の形成を調査する.
  • これらの構造的特徴がCOFベースの膜の分離性能に与える影響を評価する.

主な方法:

  • 機能化されたテレフタアルデヒドの合成
  • COF形成のためのピクテ・スペングラー反応の適用
  • 高解像度伝送電子顕微鏡 (HRTEM) を使用した特徴付け.
  • 分離用用COFベースの膜の製造と試験

主要な成果:

  • ピクテ・スペングラー反応によるCOFの合成に成功した.
  • 発生したCOFで螺栓脱位形成の傾向が増加した.
  • 典型的な2D-COFとは異なる多層のフレークの製造
  • スクリューの変位を確認する最終的なHRTEM証拠.
  • これらの構造的特徴が膜分離効率に及ぼす効果を証明した.

結論:

  • ピクテ・スペングラー反応は,ユニークな構造特性を有するCOFを生成する有効な方法である.
  • COFのスクルーの変位と多層構造は制御的に生成できます.
  • これらの構造変更は,分離技術におけるCOFベースの材料の性能に好ましい影響を及ぼします.