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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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硫链玻璃是由快速压缩形成的.

Kaiyuan Shi1,2, Xiao Dong3, Zhisheng Zhao4

  • 1Key Laboratory of Photochemistry, Institute of Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, China.

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|January 3, 2025
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概括

元素硫快速压缩形成一个独特的玻璃状聚合物链状态 (Am-SP),与其通常的S8相不同. 这种快速压缩技术为高压合成和研究硫提供了新的途径.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 固态化学 固态化学

背景情况:

  • 元素硫由于其原子倾向于形成多样化的分子和聚合物结构,因此表现出异常的全方位和多态多样性.
  • 硫的相位图是复杂的,在不同的压力和温度条件下,它在绝缘,半导体和金属状态之间过渡.

研究的目的:

  • 为了研究液体硫在快速压缩下发生的结构变化.
  • 探索快速压缩的潜力,作为一种合成新型硫相的方法,并研究它们的特性.

主要方法:

  • 使用快速压缩技术快速加压液体硫.
  • 分析了压缩硫的结构状态.

主要成果:

  • 证明快速加压有效地打破了硫的分子环结构,产生由纯链分子 (Am-SP) 组成的玻璃状聚合物状态.
  • 这种无序链状态 (Am-SP) 在通常与S8分子环相 (I阶段) 相关的压力-温度区域中被发现是转移稳定的.
  • 快速压缩技术的作用类似于热火,无论温度如何.

结论:

  • 创建元素硫玻璃 (Am-SP) 提供了一个新的平台,用于研究各种硫相中的结构性质关系.
  • 快速压缩为高压合成提供了一种多功能和快速的方法,可以控制基本的热力学参数,并可能创造新的材料.