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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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Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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Fischer Projections02:18

Fischer Projections

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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines.
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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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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チラルの分子インターカレーションスーパーラット

Qi Qian1, Huaying Ren1, Jingyuan Zhou1

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, USA.

Nature
|June 29, 2022
PubMed
まとめ

キラル誘発スピン選択性 (CISS) は,新しいキラル分子インターケレーションスーパーラット (CMIS) によって進出しています. これらの頑丈な材料は,以前の制限を克服し,高スピン偏振と磁気抵抗を持つ新しいスピントロニックデバイスを可能にします.

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科学分野:

  • スピントロニクスと材料科学
  • 凝縮物質物理学

背景:

  • チラル誘発スピン選択性 (CISS) は,スピントロニクスのための磁場フリースピン操作を提供します.
  • 既存のCISS材料は,不均一性,低選択性,および安定性の低いため,デバイスのアプリケーションを阻害しています.

研究 の 目的:

  • CISSの探索のために,新しい種類の堅固な固体キラル材料,キラル分子インターケレーションスーパーラット (CMIS) を導入する.
  • 高性能スピントロニックデバイスの作成におけるCMISの可能性を実証する.

主な方法:

  • 2次元原子結晶 (2DAC) をキラル分子と交配することでCMISを製造する.
  • X線微分,伝送電子顕微鏡,円形二重化を用いた特徴化.
  • CMISをスピンフィルタリング層として使用したスピン選択トンネルの結界点の製造と特徴付け.

主要な成果:

  • 2DACとキラル分子層の交互に並んだ超網構造が確認された.
  • 明らかにキラリティに依存する円形の二重化信号が観測された.
  • スピン選択型トンネル接続は,高いトンネル磁気抵抗 (> 300%) とスピン極化 (> 60%) を示し,明確なキラリティに依存した.

結論:

  • CMISは,CISSを調査するための堅牢で汎用的なプラットフォームを提供します.
  • 2DACの調節可能な電子特性と多様なキラル分子は,人工キラル材料の豊富なファミリーを提供します.
  • CMISは次世代のスピントロニックデバイスの開発に重要な可能性を秘めています.