関連する実験動画
Updated: Jun 10, 2026
16:24
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
セルフアセンブリと誘発された円形二重化が,コレステリックペンダント群を持つデンドリット型超分子で起こります
Antti J Soininen1, Edis Kasëmi, A Dieter Schlüter
1Department of Applied Physics, Aalto University School of Science and Technology, 02150 Espoo, Finland.
Journal of the American Chemical Society
|August 5, 2010
まとめ
キラル型デンドリト型マクロモレクルは,自己組織化して固体構造を整え,円形二重化 (CD) のような光学特性を高めます. この超分子キラリティはイオン複合から生じ,デンドリマーは高度な光学材料の汎用的なテンプレートであることを示しています.
科学分野:
- 超分子化学 超分子化学
- 材料科学 材料科学とは
- ポリマー化学のポリマー化学について
背景:
- チラルの分子は独特の光学特性を有しています.
- dendritic マクロモレキュルは,調節可能なアーキテクチャを提供する.
- 自己組み立ては,オーダーされた材料を作成するための重要な戦略です.
研究 の 目的:
- dendritic macromoleculesによって形成されたキラルなスーパモレキュルの固体構造を調査する.
- 構造的秩序と光学特性 (UVからの吸収とCD) の関係を探求する.
- 超分子キラリティを誘導するためのテンプレートとしてデンドリット型マクロモレキュルの使用を実証する.
主な方法:
- チラル・コレステリック群とアキラル・デンドリティック・マクロモレキュルのイオン複合.
- 異なる dendritic 世代を持つ複合体のホモロゴス シリーズの構築 (1-3).
- 小角X線散射 (SAXS) と伝送電子顕微鏡 (TEM) を用いた構造的特徴化.
主要な成果:
- 自己組み立て構造は,ラメラー,柱状六角形,斜め柱状,長方形柱状など,様々な相を呈した.
- 光学活動は,紫外線に対する吸収の体系的な変化と,円形の二重化 (CD) 信号の強化を示した.
- 強化された光学信号,特にCDは,固体構造の順序と格子相関長と相関する.
結論:
- デンドリティックマクロモレキュルは,キラル単位を組織するための効果的な超分子テンプレートとして機能します.
- dendritic マクロモレキュルの自由度が,自己組み立ての固体構造の順序に影響する.
- これらのシステムは,調節可能で増幅された光学特性を発揮し,高度な材料の潜在能力を示しています.
関連する概念動画
02:25Molecules with Multiple Chiral Centers
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...
02:05Prochirality
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...
02:30Chirality in Nature
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. The...
02:25Chirality
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
02:33Stereoisomerism 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,...
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
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...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...