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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Electrophilic Aromatic Substitution: Sulfonation of Benzene01:22

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Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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密度の高いセレニウム-水素系における予期せぬ化合物再構成

Huixin Hu1, Mikhail A Kuzovnikov2, Hannah A Shuttleworth2

  • 1Center for High Pressure Science and Technology Advanced Research, Shanghai, China.

Communications materials
|August 27, 2025
PubMed
まとめ

高圧下では,新しい化合物,SeH2 (H2) 2が予想外に形成されました. このセレニウム水素化合物は非金属であり,他のカルコゲン水素と異なるユニークな結晶構造を有する.

キーワード:
化学物理学段階移行と重要な現象固体と液体の構造

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科学分野:

  • 高圧物理学と化学
  • 材料科学
  • 固体化学

背景:

  • H2Seと (H2Se) 2H2化合物は,22 GPa以上の圧縮下では不安定である.
  • 高圧でのカルコゲン水素に関する以前の研究は,新しい化合物の形成の可能性を示した.

研究 の 目的:

  • セレニウム水素の高圧相性を調べるため
  • 極端な条件下で新しいセレニウム-水素化合物を合成し,特徴づけること.

主な方法:

  • 高圧高温のダイヤモンド・アンビル・セル実験
  • 構造分析のためのX線微分
  • 構造検証のための密度関数理論計算.
  • 電気抵抗の測定

主要な成果:

  • 新しい化合物であるSeH2 ((H2) 2) は,94GPa以上で合成されました.
  • X線微分法により,四角形 (I41/a m d) の構造が示され,シグザグ状のH-Se鎖とSe間隙にH2分子がある.
  • 密度関数理論の計算は,わずかな歪みがある構造を確認した.
  • 電気抵抗測定では,SeH2 (H2) 2は148GPaまで非金属であることが示された.
  • 165GPaと2000KまでのTe-Hシステムでは化合物形成は観察されなかった.

結論:

  • カルコゲン水素の高圧相はユニークで複雑である.
  • SeH2 ((H2) 2) は,独特の結晶構造を持つ新しい高圧相です.
  • これらのシステムにおける高圧行動の予測可能性に関する以前の仮定に挑戦しています.