関連する実験動画
Updated: Dec 30, 2025

16:24
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
19.2K
表面上の超分子組成における長距離秩序の工学: 離散型長鎖ナフタレンジミドにおける内部二重結合の主要な役割
José Augusto Berrocal1,2, G Henrieke Heideman1, Bas F M de Waal2
1Stratingh Institute for Chemistry , University of Groningen , Nijenborgh 4 , 9747 AG Groningen , The Netherlands.
Journal of the American Chemical Society
|January 24, 2020
まとめ
ナフタレンジイミド (NDI) のアリファティックチェーンに不飽和を導入することで,ナノテクノロジーにとって極めて重要な表面上の欠陥のない,オーダーされた分子組成の形成が劇的に改善されます. 飽和した連鎖は 秩序のない単層に繋がり 飽和していない連鎖は 秩序のない構造を生み出します
科学分野:
- 超分子化学
- 材料科学
- 表面科学
背景:
- 表面で支えられる超分子組成で長距離の秩序を達成することは,非共性表面の機能化における重要な課題である.
- 欠陥のない分子組み立ては,ナノテクノロジーの応用を進めるために不可欠です.
研究 の 目的:
- 液体/固体界面での飽和および不飽和の長いアリファティックチェーンを持つナフタレンジミド (NDI) 誘導体の自己組み立て行動を調査する.
- 自己組み立てモノレイヤーの順序と欠陥密度に対するアリファティックチェーンにおける不飽和の影響を理解する.
主な方法:
- 2つのNDIライブラリの合成:飽和と不飽和の長いアリファティックチェーン (C28とC33).
- 1-フェニロクタン/高度指向型酸化グラフィート (1-PO/HOPG) インターフェースでの分子自己組み立ての研究.
- 実験的観測を支えるための計算的研究を活用する.
主要な成果:
- 飽和および不飽和のNDIは,NDIコアを1D列に並べ,それらを分離するアリファティックチェーンで,ラメラ構造を形成する.
- 不飽和は,アリファティック鎖の互換を好み,高度に秩序づけられ,ほぼ欠陥のないモノレイヤーにつながります.
- 飽和した連鎖は,局所的な秩序にもかかわらず,グローバルに無秩序なモノレイヤーを生成する,混合された数字と非数字の配列を示します.
結論:
- アリファティック鎖の内部二重結合は,液体/固体界面での大分子パッキングと順序を決定する上で重要な役割を果たします.
- 不飽和のNDI誘導体は,飽和の同類と比較して優れた自己組み立てモノレイヤを形成する.
- この発見は,鎖不飽和を制御することによって,ナノテクノロジーのための欠陥のない分子組成を設計するための経路を提供します.
関連する概念動画
¹H NMR: Long-Range Coupling
2.5K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.5K
Stability of Conjugated Dienes
4.1K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
4.1K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
12.0K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
12.0K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement
3.3K
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.
3.3K
Ziegler–Natta Chain-Growth Polymerization: Overview
3.8K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.8K
Newman Projections
20.1K
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
20.1K

