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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is broad and...
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
Inductive Effects on Chemical Shift: Overview01:27

Inductive Effects on Chemical Shift: Overview

The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...

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関連する実験動画

Updated: Jun 24, 2026

Atomically Traceable Nanostructure Fabrication
12:35

Atomically Traceable Nanostructure Fabrication

Published on: July 17, 2015

アレネチオール膜のパターン決定因子としてのH原子の位置.

Ki-Young Kwon1, Greg Pawin, Kin L Wong

  • 1Pierce Hall/Department of Chemistry, University of California-Riverside, Riverside, California 92521, USA.

Journal of the American Chemical Society
|April 1, 2009
PubMed
まとめ
この要約は機械生成です。

アレネチオール分子は,水素結合によって導かれる表面上の特定のパターンを形成します. 重要な位置での分子間相互作用の最適化は,高度なアプリケーションのためのアレネチオールフィルムの設計を導く.

さらに関連する動画

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
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In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

Published on: March 2, 2021

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

関連する実験動画

Last Updated: Jun 24, 2026

Atomically Traceable Nanostructure Fabrication
12:35

Atomically Traceable Nanostructure Fabrication

Published on: July 17, 2015

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
06:49

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

Published on: March 2, 2021

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

科学分野:

  • 表面科学とは,地表科学である.
  • 材料化学 材料化学について
  • 超分子化学 超分子化学

背景:

  • アレネチオール分子は,金属表面の自己組み立てモノレイヤーに不可欠です.
  • 分子間相互作用を理解することは,膜の形成と特性を制御する鍵です.

研究 の 目的:

  • ベンゼネチオールおよびアントラセネチオール誘導体のCu上の自己組立における水素結合の役割を調査する.
  • 特定の分子間相互作用に基づいてアレネチオールフィルムを設計するための一般的な原則を確立する.

主な方法:

  • 低エネルギー電子 difrraction (LEED) とスキャニングトンネル顕微鏡 (STM) は,分子順序を研究するために使用されました.
  • 分子配列の進化を観察するために冷却実験を行った.

主要な成果:

  • ベンゼネチオール (BT) は,Cu{111}上で S...H 水素結合を示し,低カバーでオルトー水素を含む.
  • (メチル化) アントラセネチオールは,端末の芳香水素の相互作用によって支配される列とパターンを形成します.
  • 特定の水素原子の位置は,観察された分子秩序と膜形成を決定する.

結論:

  • アレネチオールにおけるパターン形成は,アレネの特定の水素原子位置における分子間相互作用の最適化によって制御される.
  • この原則は,特異な特性を有するオーダーされたアレネチオールフィルムの合理的な設計を導くことができます.