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相关概念视频

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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.
Sulfur Assimilation01:20

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry, similar...
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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...
VSEPR Theory and the Basic Shapes02:52

VSEPR Theory and the Basic Shapes

Overview of VSEPR Theory

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相关实验视频

Updated: May 31, 2026

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
12:30

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Published on: April 9, 2018

用硫代替的四面体.

Tatsumi Ochiai1, Masaaki Nakamoto, Yusuke Inagaki

  • 1Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.

Journal of the American Chemical Society
|July 7, 2011
PubMed
概括

研究人员合成了新的硫替代四面体和基硫基四面体. 紫外线光谱揭示了硫衍生物中的电子相互作用,与硫化合物不同,对于每种化合物都观察到不同的热分解途径.

科学领域:

  • 有机金属化学 有机金属化学
  • 合成化学 合成化学
  • 频谱学是一种光谱学.

背景情况:

  • 四面体是紧张的多面体碳化合物.
  • 硫的替代提供了独特的电子和反应性质.
  • 了解紧张系统中的结构-属性关系至关重要.

研究的目的:

  • 为了合成新的硫替代四面体衍生物.
  • 用光谱学研究这些化合物内部的电子相互作用.
  • 探索四面体衍生物的热反应和分解途径.

主要方法:

  • 三三甲四甲的合成及其与各种二甲二硫化物的反应.
  • 使用核磁共振 (NMR) 光谱和X射线晶体学进行表征.
  • 紫外线吸收光谱检测电子相互作用.
  • 热反应研究以确定分解产物.

主要成果:

  • 成功合成了稳定的硫替代四面体 (2-4) 和基基四面体 (5).
  • 紫外线视频谱表明,四面体核心和硫单双之间的σ-π相互作用在衍生品2-4.
  • 没有观察到这种电子相互作用在phenylsulfonyltetrahedrane (5).

更多相关视频

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

Published on: November 28, 2017

Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in Poly(S-Divinylbenzene)
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Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in Poly(S-Divinylbenzene)

Published on: May 20, 2019

相关实验视频

Last Updated: May 31, 2026

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
12:30

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Published on: April 9, 2018

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
08:50

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

Published on: November 28, 2017

Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in Poly(S-Divinylbenzene)
09:16

Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in Poly(S-Divinylbenzene)

Published on: May 20, 2019

  • 四面体衍生物2在加热后碎成两个乙烯分子.
  • 菲尼尔硫尼尔四烯 (5) 分解成循环丁烯.

    • 结论:

    • 四面体中硫的替代可以导致与核心结构的显著电子相互作用.
    • 硫替代物的性质 (例如,硫基) 影响这些电子相互作用.
    • 用硫替代的四面体和基硫基四面体表现出不同的热分解机制,突出显示了功能化对反应性的影响.