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関連する概念動画

Chirality02:25

Chirality

29.8K
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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Coordination Number and Geometry02:57

Coordination Number and Geometry

19.1K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Chirality in Nature02:30

Chirality in Nature

17.3K
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.
17.3K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

27.0K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
27.0K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

12.6K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
12.6K
Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

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By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
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関連する実験動画

Updated: Feb 15, 2026

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

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非対称な配列反応のためのキラル調整ケージの設計と組み立て

Jingjing Jiao1, Chunxia Tan1, Zijian Li1

  • 1School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, China.

Journal of the American Chemical Society
|January 19, 2018
PubMed
まとめ

研究者はアシンメトリックな触媒のためのキラル調整ケージを設計した. 混合リンカーケージは,反応物質の濃度と安定化により,連続反応を効率的に触媒化し,活性とエナチオ選択性を示した.

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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine
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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

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関連する実験動画

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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine
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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
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科学分野:

  • 超分子化学
  • 協調化学
  • 非対称な触媒

背景:

  • 多数の触媒部位を持つ超分子ナノ炉は,非対称な触媒作用には不可欠であるが,合成は困難である.
  • キラルメタロサレン複合体は,触媒的な応用の可能性を備えています.

研究 の 目的:

  • シングル・リンカーとミックス・リンカーの四面体協調ケージの設計と組み立て
  • 超分子ナノ原子炉の触媒活性を調べるため

主な方法:

  • 5つのキラルコーディネーションケージの合成は,エナティオプア Mn (塩素),Cr (塩素),Fe (塩素) とCp3Zr3クラスターからの二酸化炭素リガンドを使用する.
  • 単結晶/粉末X線微分法,ICP-OES,Q-TOF MS,EDXを用いた特徴付け
  • 連続した非対称アルケンのエポキシド化/エポキシド環開き反応における触媒性能の評価

主要な成果:

  • ナノスケールの水害性空洞を備えた5つのキラル調整ケージの組み立てに成功しました.
  • 効率的な超分子触媒としての混合結合器のケージ (Mn{\salen}/Cr{\salen}) の実証
  • 連続的な非対称反応では,最大99. 9%のエナチオ選択性 (ee) を達成した.
  • 自由な触媒と比較して,強化された活性とエナチオ選択性が観察されました.

結論:

  • 開発された調整ケージは,非対称な触媒のための効果的な超分子ナノ反応器として機能します.
  • 活性部位を安定させ,空洞内の反応物質を濃縮することで,触媒の性能が向上する.
  • オーガニックリンカーの設計は 新しく機能的な超分子構造を 設計するための道筋を提供します