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Updated: May 12, 2026
16:24
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
フラーレンの頂点を有する形分子を結晶や液晶の極柱に積み重ねる
Masaya Sawamura1, Kenji Kawai, Yutaka Matsuo
1Department of Chemistry, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Nature
|October 18, 2002
まとめ
研究者らは,C(60) フラーレンを用いて,極性液体結晶材料を作成するために,新しい深層の形分子を開発しました. これらのフルレン基化合物は,ユニークなスタッキング行動を示し,光学と電子学の新しいアプリケーションを可能にします.
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:
- 極性液晶材料は,光学および電子機器において極めて重要です.
- 分子の形状と相互作用が液晶の配列を決定する.
- 以前の形分子には,平らさと反転による制限がありました.
研究 の 目的:
- 極性液晶材料のための新しい深層円形分子を設計・合成する.
- フルレン基の形分子の自己組み立てと液晶の性質を調査する.
- 先進的な機能的な材料を作成するための新しい戦略を探求する.
主な方法:
- 5つの芳香基を持つC ((60) フルレレン誘導体の合成.
- 分子構造と自己組み立て行動の特徴化.
- 熱熱性および熱熱性液体結晶の性質の調査.
主要な成果:
- 5つの芳香基をC(60) フラーレンに結合することで,深層の円形の分子が生成される.
- これらの分子は,極の柱状の液体結晶の集合体へと自己組み立てます.
- フルレンの部分と芳香基は,安定したスタッキングのための魅力的な相互作用を駆動します.
- アリファティックチェーンを持つ拡張芳香基は,熱熱性および熱熱性両方の性質を持つ化合物を生み出した.
- 以前のフルレンの液晶とは異なり,フルレンはメソゲンに不可欠です.
結論:
- C(60) フラーレンを用いた新しい設計戦略により,極性液晶のための深層の形分子が成功裏に作成されました.
- その結果生じる材料は,ユニークなスタッキングと望ましい液体結晶の性質を示します.
- このアプローチは,高度なアプリケーションのための新しい極性液晶材料の範囲を開発するための汎用的なプラットフォームを提供します.
関連する概念動画
02:42Ionic Crystal Structures
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...
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...
02:37Metallic Solids
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
02:06Newman Projections
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 conformers.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
02:29Conformations of Cycloalkanes
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3 hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that was based on the...
02:11Conformations of Cyclohexane
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
02:02Chair 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...
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...