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相关概念视频

Keto–Enol Tautomerism: Mechanism01:14

Keto–Enol Tautomerism: Mechanism

5.1K
The keto and enol forms are known as tautomers and they constantly interconvert (or tautomerize) between the two forms under acid or base catalyzed conditions. Both the reactions involve the same steps—protonation and deprotonation— although in the reverse order.
5.1K
Solvating Effects02:12

Solvating Effects

7.3K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
7.3K
Crown Ethers02:36

Crown Ethers

5.1K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
5.1K
Intermolecular Forces03:13

Intermolecular Forces

57.5K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
57.5K
Physical Properties of Ethers02:17

Physical Properties of Ethers

6.8K
Overview
An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...
6.8K
Reactivity of Enols01:18

Reactivity of Enols

2.9K
Enols are a class of compounds where a hydroxyl group is attached to a carbon–carbon double bond, which implies that it is a vinyl alcohol. A carbonyl compound with an α hydrogen undergoes keto–enol tautomerism and remains in equilibrium with its tautomer, the enol form. Usually, the keto tautomer is present in a higher concentration than the enol tautomer due to the higher bond energy of C=O compared to C=C. Moreover, the direction of the keto–enol equilibrium is...
2.9K

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Updated: May 30, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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-乙烯相互作用:结构特征和计算分析.

Novan A G Gray1, James F Britten2, David J H Emslie1

  • 1Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, L8S 4M1, Canada. emslied@mcmaster.ca.

Chemical communications (Cambridge, England)
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PubMed
概括
此摘要是机器生成的。

这项研究报告了复合体中s-块- Telluroether结合的第一个明确的例子. 较短的K-Te距离和计算分析证实了这些新的相互作用,扩大了对化学的知识.

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科学领域:

  • 有机金属化学 有机金属化学
  • 无机化学 无机化学
  • 计算化学计算化学

背景情况:

  • 复合物与连体对理解新型结合相互作用有兴趣.
  • 之前的研究已经探索了相关的金属-素键,但涉及乙烯的明确例子缺乏.

研究的目的:

  • 为了合成和描述新的-乙烯复合物.
  • 提供第一个明确的实验和计算证据,证明s-block-telluroether结合.
  • 研究这些复合体在不同条件下的结构多样性.

主要方法:

  • 来自四基 (THF) 和六的复合物的结晶.
  • 合成化合物的结构确定X射线晶体学.
  • 密度函数理论 (DFT) 和分子中的原子量子理论 (QTAIM) 计算来分析结合.

主要成果:

  • 合成和X射线晶体学表征[K(ATe2Tripp2) 的{THF) 3 (2-Te),显示相比前身[K(ATe2Tripp2) 的{dme) 2 (1-Te) 的K-Te距离显著更短.
  • 计算研究 (DFT和QTAIM) 对K-TeR2相互作用提供了强有力的支持,证实了s-block-telluroether键.
  • 在不同的制备条件下,分离相关复合物[K(ATe2Tripp2) (THF) 2 (3-Te),[K(ATe2Tripp2) (THF) ] (4-Te) 和[K(ATe2Tripp2) ] (5-Te).
  • 类似物 (2-Se,3-Se,4-Se) 的合成和部分表征.

结论:

  • 这项研究提供了第一个明确的s块-telluroether结合的例子.
  • 实验证实了K-TeR2相互作用,并得到了计算支持.
  • 这些发现为探索金属-素化学中的结合开辟了新的途径.