関連する実験動画
Updated: Jun 6, 2026
09:25
Fabricating van der Waals Heterostructures with Precise Rotational Alignment
Published on: July 5, 2019
光駆動の可逆ハンドネス逆転は,自己組織化した螺旋状の上部構造で起こります.
Manoj Mathews1, Rafael S Zola, Shawn Hurley
1Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44242, USA.
Journal of the American Chemical Society
|December 4, 2010
まとめ
研究者は,光に反応するキラルドーパントを使用して,液晶の可逆色調を達成しました. この高速フォトンモードのスイッチングにより,青から近赤外線まで調整可能な反射色が可能になり,新しい光学材料の可能性が生まれます.
科学分野:
- マテリアルサイエンス 材料科学
- 有機化学 オーガニック・ケミストリー
- フォトニクス フォトニクスとは
背景:
- コレステリック液晶は,自己組織化された螺旋状の上部構造を示します.
- キラルドーパントは,液晶の螺旋構造を誘発し,制御する.
- フォトアイソメリゼーション可能な分子は,光に調節可能な特性を提供します.
研究 の 目的:
- コレステリック液晶における可逆的なハンドネス逆転のための高速光子モード法を開発する.
- 光異性化可能なキラルサイクルアゾベンゼノファンを,調節可能な光学特性のドーパントとして利用する.
- 異なるドーパントスイッチング状態を使用して,反対の螺旋手性の誘導を調査する.
主な方法:
- 2つのキラルサイクルアゾベンゼノファンの合成と特徴付け.
- ドーパントをアキラル液晶宿体に組み込む.
- 光照射によって誘発された光異体化 (トランス-シス).
- 新しい方法を用いて,螺旋状のハンド性を直接決定する.
主要な成果:
- クイラルドーパントは,ラセミゼーションなしに,可逆的なトランス-シスイソメリゼーションを示した.
- 螺旋回転力の高さと,光イソメリゼーションに起因する重要な変化が観察されました.
- 青から近赤外線までの反射色の可逆調整が達成されました.
- 反対の螺旋的な手性は,ドーパントの異なるスイッチング状態によって誘発された.
結論:
- フォトアイソメリゼーション可能なキラルサイクルドーパントは,コレステリック液晶における迅速で可逆的なハンドネス反転を可能にします.
- 幅広いスペクトル (青から近赤外線まで) にわたる光誘発色調は実現可能である.
- 開発された方法は,長いピッチのコレステリック相における螺旋手性の明確な決定を可能にします.
関連する概念動画
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...
01:15Mechanisms of Membrane-bending
The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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...
02:52Stereoisomerism
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...
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...
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...
01:26Reversible or Opposing Reactions
Reversible or opposing reactions play a crucial role in understanding the dynamic nature of chemical processes. While kinetics focuses on how reactions proceed, thermodynamics emphasizes that most reactions do not reach completion. Instead, a reverse reaction starts occurring over time, and when its rate equals that of the forward reaction, a dynamic equilibrium is established.For example, consider a simple chemical process where A forms B reversibly. The rate constants for the forward and...