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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

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The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
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Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen 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 unequally shared....
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Hydrogen Bonds01:04

Hydrogen Bonds

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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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UV–Vis Spectroscopy of Conjugated Systems01:32

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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深い紫外線透明の非線形光学水素結合有機フレームワーク

Zichen Wang1, Xingxing Jiang2, Xiaoyang Wang3

  • 1China-Australia Joint Research Center for Functional Molecular Materials, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China.

Journal of the American Chemical Society
|December 22, 2025
PubMed
まとめ

研究者は新しい深紫 (UV) 非線形光学 (NLO) 結晶O3SCH2NH3を開発し,現在のNLO材料の限界を克服しました. この新素材は 独特の水素結合有機構造により 優れた深紫外線透明性と 強い非線形光学特性を有しています

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科学分野:

  • 材料科学
  • 光電子機器
  • クリスタルグラフィー

背景:

  • 先進的な光電子アプリケーションには,深紫外線 (UV) の非線形光学 (NLO) 材料が必要です.
  • 既存のUV NLO材料は,限られた微細構造の選択肢と調整の困難により,課題に直面しています.

研究 の 目的:

  • 水素結合の有機構造を持つ最初の 深い紫外線透明のNLO結晶を報告する
  • 現在のUV NLO素材開発の限界に対処するためです.

主な方法:

  • 結晶構造を設計するための計算による単位置換戦略.
  • O3SCH2NH3結晶の合成
  • 深紫外線の透明性,第2ハーモニック生成 (SHG),および二重断裂性を含む光学特性の特徴.
  • 理論的な計算と結晶構造の分析

主要な成果:

  • 新型O3SCH2NH3結晶は170nm以下で深紫外線の透明性を示しています.
  • 1064 nmで3.8 × KH2PO4と532 nmで0.7 × β-BaB2O4という強力な粉末第2ハーモニック生成反応を示している.
  • 十分な二重断裂 (Δn(1̅10) = 0.060 @ 546 nm) が観察されました.

結論:

  • [O3SCH2NH3]プリミティブの均一な配列は,3次元有機構造における水素結合によって促進され,例外的なNLO性能の鍵となる.
  • O3SCH2NH3は,深紫外線の光電子アプリケーションのための有望な新材料です.