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関連する概念動画

Determination of Crystal Structures01:29

Determination of Crystal Structures

35
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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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Chirality02:25

Chirality

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Prochirality02:05

Prochirality

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Chirality in Nature02:30

Chirality in Nature

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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ヘリコイド結晶における二重化

Xiaoyan Cui1, Shane M Nichols1, Oriol Arteaga2

  • 1Department of Chemistry and Molecular Design Institute, New York University , 100 Washington Square East, New York, New York 10003, United States.

Journal of the American Chemical Society
|September 13, 2016
PubMed
まとめ
この要約は機械生成です。

この研究では,歪んだd-マニトールの結晶を分析するために,ヘリコイド二重化法が導入されます. この光学的方法は 複雑な材料のメソ構造を明らかにし 染み付いた生物学的組織の 伝統的な顕微鏡を超えて進みます

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

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関連する実験動画

Last Updated: Mar 15, 2026

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Published on: April 14, 2020

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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科学分野:

  • 光学とフォトニクス
  • 材料科学
  • クリスタルグラフィー

背景:

  • 複雑な材料を特徴付けるには,異質的,アニソトロプ的,吸収性,光学的に活性な媒介との光の相互作用を理解する必要があります.
  • 染色された生物学的構造はこれらの光学的複雑性を共有しますが,ペトログラフィック顕微鏡を超えた体系的な分析は限られています.
  • 分子結晶はしばしばヘリコイドリボンとして成長しますが,これは一般的な現象ですが,過小評価されています.

研究 の 目的:

  • 複雑で透明な材料,特に歪んだd-マニトール結晶の 体系的な光学分析を確立する.
  • 水晶のメソ構造を特徴づけるためのヘリコイド二重化の有用性を実証する.
  • 光を吸収する分子で育った d-マニトールポリモルフの光学特性を調べるため

主な方法:

  • 光を吸収する分子を含む溶液から,歪んだd-マニトール結晶 (ポリモルフαとδ) を育てる.
  • ミュラーマトリックス画像ポリメトリを用いて光学特性を測定する.
  • 光学特性をシミュレートする ラメラ微細構造とアニゾトロプ的吸収

主要な成果:

  • 染料で育ったd-マニトールのポリモルフは,偏光白で強い線形二重化を示します.
  • ヘリコイド二重性は,染み付けられたパターンの多結晶のメソ構造を効果的に特徴づけている.
  • この研究は,ビス・アゾ染料の シカゴスカイブルーの 特定の吸収特性をモデル化している.

結論:

  • ヘリコイド二重化は,歪んだ結晶材料のメソ構造を分析するための強力な方法を提供します.
  • この技術は従来の顕微鏡で入手するのが難しい洞察力を提供します.
  • この発見は,染み付いた生物学的組織のような複雑なアニゾトロプ的物質の 光学的な特徴づけを進めている.