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関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.6K
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...
31.6K
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...
5.3K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

16.3K
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...
16.3K
Chirality in Nature02:30

Chirality in Nature

17.9K
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.
17.9K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

7.3K
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...
7.3K
Valence Bond Theory02:42

Valence Bond Theory

11.6K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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メタル・オーガニック・フレームワークにおけるキラル誘導の顕微鏡メカニズム

Jack D Evans1, François-Xavier Coudert1

  • 1Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris , 75005 Paris, France.

Journal of the American Chemical Society
|May 6, 2016
PubMed
まとめ

N-メチル-2-ピロリドン (NMP) を使用した金属有機フレームワーク (MOF) のキラル誘導は可能ですが,結果として得られるキラルMOF-5は不安定です. チラリティは,ゲストの除去時に失われ,エナンチオセレクティブ分離と触媒の適用を制限する.

科学分野:

  • 材料科学
  • 超分子化学
  • コンピュータ化学

背景:

  • メタル・オーガニック・フレームワーク (MOF) は,エナチオセレクティブ分離と触媒の潜在的用途を持つ多孔性材料です.
  • 最近,非キラルゲスト吸収によるMOFにおけるキラル誘導が報告され,キラルMOFの産生のための新しい経路を提供している.
  • MOF-5はプロトタイプのフレームワークで,このキラル誘導現象を実証しました.

研究 の 目的:

  • MOF-5におけるキラル誘導の顕微鏡的メカニズムを非キラル誘導で解明する.
  • ゲスト除去後のキラルMOF-5構造の安定性を調査する.
  • キラル変換過程におけるゲスト分子特性 (サイズ,化学性質) の役割を理解する.

主な方法:

  • キラル誘導過程を研究するために,多層次分子シミュレーションが採用されました.
  • ゲスト分子 (N-メチル-2-ピロリドーンとN,N-ジメチルフォームミド) とMOF-5フレームワークの相互作用を分析した.
  • ゲストフリーキラルMOF-5構造のエネルギー安定性を評価した.

主要な成果:

  • N-メチル-2-ピロリドン (NMP) の分子サイズと化学的性質は,MOF-5におけるキラル誘導を可能にする重要な要因として特定されました.

さらに関連する動画

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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  • N,N- ディメチルフォーマミド (DMF) はキラリティを誘導せず,相互作用の特異性を強調した.
  • ゲストフリーキラルMOF-5構造はエネルギー的に不安定で,アキラルまたは閉孔構成を好むことが判明した.

    • 結論:

    • NMPによるMOF-5におけるキラル誘導は有効な現象であるが,結果として得られたキラル性は,フレームワークの不安定性により,ゲスト除去時に保持されない.
    • この不安定性は,分離と触媒のための安定したキラルMOFを作成するためのこの方法の直接的適用を制限します.
    • この研究は,ゲスト-フレームワークの相互作用に関する重要な顕微鏡の洞察を提供し,潜在的なアプリケーションのための他のゲスト分子を探求することを提案しています.