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Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

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.
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Nuclear Fusion02:45

Nuclear Fusion

The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...

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Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes
10:04

Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes

Published on: May 26, 2014

アンモニアは水素結合をしていますか?

D D Nelson, G T Fraser, W Klemperer

    Science (New York, N.Y.)
    |December 18, 1987
    PubMed
    まとめ
    この要約は機械生成です。

    顕微鏡の研究では,アンモニア (NH3−) が強い水素結合受容体であることを明らかにしているが,陽子ドナーとして作用する証拠はほとんどない. これはNH ((3)) 相互作用に関する以前の仮定に異議を唱える.

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    Membraneless Hydrogen Peroxide Fuel Cells as a Promising Clean Energy Source
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    Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes
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    Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes

    Published on: May 26, 2014

    Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
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    Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

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    科学分野:

    • 化学スペクトロスコーピーは,化学スペクトロスコーピーを用います.
    • 分子相互作用とは
    • 物理化学 物理化学

    背景:

    • アンモニア (NH3) は化学における基本的な分子である.
    • 以前の研究で,水素結合におけるその役割が調査された.
    • NH ((3) の相互作用メカニズムを理解することは,様々な化学プロセスにとって極めて重要です.

    研究 の 目的:

    • アンモニア複合体のステレオ化学をスペクトル顕微鏡で特徴づける.
    • 水素結合におけるアンモニアの陽子ドナーと受容体の能力を調査する.
    • NH3の相互作用に関する新しい実験的発見と既存の理論を調和させる.

    主な方法:

    • アンモニア複合体を分析するために,高度なスペクトロスコピー技術を使用しました.
    • NHを伴う相互作用のステレオ化学的結果を調べた.
    • 凝縮相およびガス相観測に関する既存の文献を批判的に評価した.

    主要な成果:

    • ほぼ普遍的な陽子受容体としてのアンモニアの役割が確認されました.
    • 弱い陽子ドナーからNHへの水素結合を観測した.
    • NH(3) が水素結合における陽子ドナーであることを支持するスペクトル学的証拠は見つかりませんでした.

    結論:

    • アンモニア (NH3) は,強力な水素結合受容体として効果的に機能します.
    • NH(3) が水素結合を寄与する傾向は最小のようです.
    • 実験データにより,NH3が水素結合における二重の役割を担うという長年にわたる見解に異議を唱える.