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関連する概念動画

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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関連する実験動画

Updated: Jul 13, 2026

Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model
06:54

Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model

Published on: August 22, 2015

プロトン固体NMRスペクトロスコーピーによる粉末結晶学.

Bénédicte Elena1, Lyndon Emsley

  • 1Laboratoire de Chimie (UMR 5182 CNRS/ENS), Ecole Normale Supérieure de Lyon, 69364 Lyon, France.

Journal of the American Chemical Society
|June 23, 2005
PubMed
まとめ

陽子の高解像度のマジック・アングル・スピニングNMRは,有機化合物の結晶の配列を明らかにする. この方法では,スピン-拡散の蓄積曲線を用いて,単位細胞の寸法などの結晶構造のパラメータを正確に決定します.

科学分野:

  • 固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) スペクトロスコーピーは,固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR) スペクトロスコーピーの固体核磁共振 (NMR)
  • クリスタログラフィーです.
  • マテリアルサイエンス 材料科学

背景:

  • 粉末化有機化合物の結晶構造を調べることは,その性質を理解するために極めて重要です.
  • 伝統的な方法は,分子レベルで詳細な構造情報を解明する上で限界がある可能性があります.
  • 核磁共振 (NMR) スペクトロスコピーは,分子分析のための強力な非破壊的な技術を提供します.

研究 の 目的:

  • 結晶構造を調査するための方法として,陽子の高解像度マジック・アングル・スピニングNMRを確立する.
  • 1H-1Hスピン・ディフュージョン・ビルアップ・カーブとレート・マトリックス分析を構造的探査に活用する.
  • 結晶構造のパラメータに対する実験的なNMRデータの依存性を実証する.

主な方法:

  • 高解像度マジック・アングル・スピニング (HRMAS) NMRスペクトロスコピーを粉末化有機化合物に適用する.
  • 率行列アプローチを用いた1H-1Hスピン-拡散の蓄積曲線の分析.
  • 実験的な1H NMRデータと,結晶構造モデルに基づくシミュレーションの比較.

さらに関連する動画

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

関連する実験動画

Last Updated: Jul 13, 2026

Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model
06:54

Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model

Published on: August 22, 2015

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

主要な成果:

  • この研究では,有機固体の結晶配列を検出するために,HRMAS NMRを成功裏に採用しました.
  • 1Hの実験的なNMRデータは,単位細胞の寸法と分子指向を含む結晶構造のパラメータに強い依存を示しています.
  • 主要な結晶構造のパラメータは,モデル有機化合物の実験的に決定されました.

結論:

  • 陽子の高解像度マジック・アングル・スピニングNMRは,結晶構造のパラメータを決定するための効果的な方法である.
  • スピン-拡散の蓄積曲線の速度行列分析は,分子包装に関する定量的な洞察を提供します.
  • このNMRアプローチは,結晶性有機物質の構造的特徴化のための貴重なツールを提供します.