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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

10.2K
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...
10.2K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.4K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.4K
Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.6K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
4.6K
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

2.0K
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
2.0K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

46.4K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
46.4K
Ionic Crystal Structures02:42

Ionic Crystal Structures

16.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.2K

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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ディスクレート・オープン・シェル・トリス (バイピリジニウム・ラジカル・カチオン) 固体インクルージョン・コンプレックス

Ommid Anamimoghadam1, Leighton O Jones1, James A Cooper1

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society
|December 21, 2020
PubMed
まとめ
この要約は機械生成です。

研究者らは,メチルバイオゲンラジカルカチオンでインクルージョン複合体を形成する新しいサイクロファンを合成した. この研究は,宿主-ゲスト化学による有機磁気材料の設計に関する洞察を提供します.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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科学分野:

  • 超分子化学
  • 有機物質科学
  • 固体化学

背景:

  • 有機基の性質は,結晶上の構造体内の基と基の相互作用によって決定される.
  • サイクロファンの化学は 機能的な有機物質を設計するためのプラットフォームを提供します

研究 の 目的:

  • 置換されたテトラケーション性サイクロファンの合成と特徴付け,メチルバイオゲンラジカルカチオンによるその含有複合体.
  • ホスト・ゲスト結合と固体状態の特性に対するメトキシ置換剤の影響を調査する.
  • 放射性物質の磁気特性を調べる

主な方法:

  • サイクロビス ((パラクアット-p-1,4-ジメトキシフェニレン) の合成と特徴づけ
  • ゲストの結合関係を評価するテスト
  • 構造分析のためのX線微分
  • 電子パラマグネティック共振 (EPR) と密度関数理論 (DFT) のスピン状態の決定.
  • 超伝導量子干渉装置 (SQUID) マグネトメトリ

主要な成果:

  • 縮小されたサイクロファンとメチルバイオゲンラジカルカチオン (MV• +) の1:1インクルージョン複合体が形成された.
  • メトキシ置換剤は,減少したサイクロファンに対するMV•+の結合を著しく減少させた.
  • X線 difraksionは,弱い分子間軌道オーバーラップを持つ 1:1複合体の離散的な上部構造を明らかにした.
  • EPRとDFTは 軌道が重なり合っているため 地面回転が2倍になったことを確認しました
  • SQUID測定は,関連トライラジカル複合体における1Dハイゼンベルク鎖を形成する反鉄磁気相互作用を示した.

結論:

  • オーガニック・ラジカル・コンプレクスの性質に,上層構造がどのように影響するかを示しています.
  • この発見は,宿主-ゲストの超分子戦略を用いた新しい有機磁気材料の設計への道を示しています.
  • サイクロファンの構造の変化により 結合の親和性や磁気的行動が調整できます