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関連する概念動画

Stereoisomerism02:52

Stereoisomerism

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...
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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,...
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

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関連する実験動画

Updated: Jul 13, 2026

Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology
07:07

Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology

Published on: March 12, 2015

調節可能な柱状メソフェーズは,C2対称な芳香性ドナー-受容体複合体を利用しています.

Joseph J Reczek1, Karen R Villazor, Vincent Lynch

  • 1Department of Chemistry and Biochemistry, The University of Texas at Austin, Texas 78712, USA.

Journal of the American Chemical Society
|June 15, 2006
PubMed
まとめ

研究者らは,電子が豊富なナフタレン (Dan) と電子欠乏のダイミド (Ndi) の誘導体を使用して,自己組み立て分子列を作成しました. これらの材料は,安定したメソフェーズを形成し,相変化温度を予測可能に調節し,結晶化時に色変化を示します.

さらに関連する動画

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

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

Published on: March 24, 2018

Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library
10:17

Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library

Published on: January 14, 2020

関連する実験動画

Last Updated: Jul 13, 2026

Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology
07:07

Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology

Published on: March 12, 2015

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

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

Published on: March 24, 2018

Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library
10:17

Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library

Published on: January 14, 2020

科学分野:

  • マテリアルサイエンス 材料科学
  • 超分子化学 超分子化学
  • オーガニック・エレクトロニクス

背景:

  • ナフタレン (Dan) ドナーとナフタレンテトラカルボキシルジミド (Ndi) アクセプタは,分子自己組み立てに使用されます.
  • 以前の研究は,複雑な分子システムの溶液相組成に焦点を当てていた.

研究 の 目的:

  • 固体状態で,ダンとニディの誘導体を用いて,交互に顔を中心に積み重ねられた構造を持つ延長された列の組み立てを指揮する.
  • これらの自己組み立てシステムの熱特性と相相性を調査する.
  • コンポーネントの特性とメソフェーズ行動の関係を探求する.

主な方法:

  • 1,5-dialkoxynaphthalene (Dan) と1,4,5,8-naphthalenetetracarboxylic diimide (Ndi) の微生物を合成する.
  • 1:1 Dan:Ndi 混合物の形成と特徴.
  • 熱分析 (DSC,TGA) で,メソフェーズ安定性と移行温度を決定する.
  • 固体組成物の構造分析. 固体組成物の構造分析.

主要な成果:

  • 1:1 Dan:Ndiの混合物は,110°Cまで安定したメソフェーズを形成した.
  • メソファゼは,柔らかい/プラスチックの結晶相と,いくつかの液体結晶の性質を示し,ドナー-受容体列を交互に交代させた.
  • メソフェーズ移行温度と個々のDanおよびNdi成分の融解/クリアリングポイントの間の相関が観察されました.
  • ステリカルに阻害された誘導体は,相分離により結晶化時に赤から黄色に劇的な色変化を示した.

結論:

  • Dan と Ndi の誘導体は,固体状態で交互に変形する柱状の自己組み立ての形成を効果的に導けます.
  • メソフェーズ移行温度は,適切な Dan と Ndi コンポーネントを選択することで予測可能である.
  • ステリカルに阻害されたシステムにおける相分離は,結晶化時に光学特性に大きな変化をもたらします.