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関連する概念動画

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.8K
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...
2.8K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

4.6K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
4.6K
Valence Bond Theory02:42

Valence Bond Theory

8.5K
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...
8.5K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

505
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
505
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.4K
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,...
42.4K
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

8.8K
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,...
8.8K

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関連する実験動画

Updated: Jun 26, 2025

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
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サイクロヘプタトリエニルブリッジド トリプルデッカー複合体

Adrian Hauser1, Luca Münzfeld1, Sören Schlittenhardt2

  • 1Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, D-76131 Karlsruhe, Germany.

Journal of the American Chemical Society
|May 8, 2024
PubMed
まとめ

この研究は,サイクロヘプタトリエニル環を備えた最初の三層化合物を含む,新しい稀土の多層サンドイッチ複合体を導入します. これらの複合体は独特の磁気特性とリガンド配列を示しています.

さらに関連する動画

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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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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関連する実験動画

Last Updated: Jun 26, 2025

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
07:56

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

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

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

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

Published on: July 27, 2022

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科学分野:

  • 有機金属化学
  • 稀土の化学
  • 協調化学

背景:

  • マルチデッカー・サンドイッチ・コンプレックスは,そのユニークな電子および磁気特性により興味を惹きます.
  • 稀土元素はf電子によって様々な協調の可能性を備えています
  • サイクロヘプタトリエニル (Cht) とサイクロオクタテトラエニル (Cot) リガンドは,有機金属化学で多用途である.

研究 の 目的:

  • 稀土元素を含む新型の多層構造の有機金属サンドイッチを合成し,特徴づけること.
  • サイクロヘプタトリエニル (Cht) と代用されたサイクロオクタテトラエニル (CotTIPS) リガンドのYIIIとErIIIとの調整化学を調査する.
  • 合成されたErIII複合体の磁性特性を調査する.

主な方法:

  • 稀土ハライド,テトラヒドロフラン (thf),ボロヒドリドを用いた逆サンドイッチ複合体の合成.
  • 1,4-bis ((triisopropylsilyl) cyclooctatetraenyl (CotTIPS) リガンドを導入してトリプルデッカー複合体を形成する.
  • 構造的特徴と磁気感受性の測定

主要な成果:

  • 第1回構造的に特徴づけられた,サイクロヘプタトリエニル (Cht) リガンドを持つ多層の有機金属サンドイッチ複合体.
  • 中央デッキとしてChtリガンドとCotTIPSリガンドを持つ前例のない稀土のトリプルデッカー複合体の分離.
  • ブロック温度13.5KのErIIIコンゲナーにおける反鉄磁気結合の観測
  • リガンドの再編成により,2つの異なった置換Cotリガンドを持つトリプルデッカー複合体の選択的形成.

結論:

  • 純粋に炭素ベースのリガンドで希土の多層サンドイッチ複合体を構築する可能性を実証した.
  • 複合的な多核稀土構造を形成する際にChtとCotのリガンドの汎用性を強調した.
  • 稀土の3階建て複合体の磁気行動についての洞察を提供した.