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相关概念视频

Organic Compounds03:02

Organic Compounds

All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

Dipole Moment of a Molecule
Carboxylic Acid Derivatives: Overview01:15

Carboxylic Acid Derivatives: Overview

Carboxylic acid derivatives are formed by replacing the hydroxyl group of carboxylic acids with a different functional group. The most common carboxylic acid derivatives are:
Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles01:11

Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles

Naming Amides
The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.

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相关实验视频

Updated: Jun 21, 2026

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
07:02

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

Published on: August 25, 2016

化效应:N,N-二甲基乙烯胺和-N,N-二甲基乙烯胺的气相结构和 perfluoro-N,N-二甲基乙烯胺.

F Trautner1, T Abe, H Oberhammer

  • 1Institut für Physikalische und Theoretische Chemie, Universität Tübingen, 72076 Tübingen, Germany.

Journal of the American Chemical Society
|July 18, 2001
PubMed
概括
此摘要是机器生成的。

该研究表明,化显著改变了N,N-二甲基维尼胺的分子结构,由于电子和固体效应,将二甲基维尼胺组从平面向垂直方向转移.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry
06:56

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry

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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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科学领域:

  • * * 物理化学 物理化学
  • * 计算化学 计算机化学
  • * 分子结构的确定.

背景情况:

  • * 了解有机分子的结构偏好在化学中至关重要.
  • *众所周知,化会诱导分子结构的显著电子和硬质变化.

研究的目的:

  • * 确定和比较N,N-二甲基维尼胺及其 perfluorinated 模拟的气相结构.
  • * 通过实验和计算方法研究化诱导的构造变化.

主要方法:

  • * 气体电子衍射 (GED) 用于实验性结构确定.
  • * 量子化学计算,包括B3LYP和MP2方法和6-31G基数组,用于理论分析.
  • *进行了自然键轨道 (NBO) 分析,以解释观察到的结构变化.

主要成果:

  • * 两种化合物中的原子都呈现出轻微的金字塔结构.
  • * N,N-二甲基乙烯胺显示了 (CH3) 2N 组的平面方向,其中的单一对几乎垂直于乙烯平面.
  • * perfluoro-N,N-dimethylvinylamine 显示了 (CF3) 2N 组的垂直方向,单一对与 C=C 键平行.

结论:

  • * perfluorination 诱导了N,N-二甲基乙烯胺的实质性形状变化.
  • * 电子效应 (结合和异构效应) 和硬质因素决定了观察到的形状偏好.
  • * 应用的计算方法准确地复制了实验中的气相结构.