2つ,3つの構成要素のダイアリエステン結晶の多色フォトクロミズム
Masakazu Morimoto1, Seiya Kobatake, Masahiro Irie
1Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan.
Journal of the American Chemical Society
|September 4, 2003
まとめ
新型フォトクロミックシングル結晶は,光照射時に複数の色を発現します. これらのダイアリエステンベースの材料は,熱的に安定した色を示し,高度な光学メモリとディスプレイアプリケーションの可能性を秘めています.
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
- フォトケミストリー フォトケミストリー
背景:
- フォトクロミック素材は,光にさらされると色が変わります.
- ダイアリレテンは,その光色特性で知られている有機化合物のクラスです.
- フォトクロミック材料の色と安定性を制御することは,アプリケーションにとって非常に重要です.
研究 の 目的:
- 3つの異なるダイアリレチンを用いて新しい光色単結晶を合成する.
- これらの多成分結晶の光染色行動と色変化を調査する.
- これらの材料の光電子技術における潜在的な応用を評価する.
主な方法:
- 3つのダイアリレチンの誘導体の合成:1,2-bis(3,5-ジメチル-2-チエニル) パルフッロcyclopentene (1a),1,2-bis(2,5-ジメチル-3-チエニル) パルフッロcyclopentene (2a),および1,2-bis(2-メチル-5-p-メトキシフェニル-3-チエニル) パルフッロcyclopentene (3a).
- 合成した単一結晶を特定の波長の光で照射して,光色化を誘発する.
- 色の変化 (黄色,オレンジ,赤,紫,青,緑,黒) と暗闇での熱安定性の評価.
- 可視光で色を漂白することによって,光染色プロセスの可逆性をテストする.
主要な成果:
- 3つの異なるダイアリレチンを含む新しい光色単体結晶を成功裏に準備しました.
- 光照射で幅広い色のスペクトル (黄色から黒) が観測され,調節可能な光色素性を示した.
- 生成された色は,光がない場合でも熱的に安定していることが実証されました.
- 色は,可視光照射を使用して完全に逆転 (漂白) することが確認されました.
結論:
- 合成されたダイアリエステンベースの単結晶は,多機能で多色の光色性を表しています.
- これらの材料は,優れた熱安定性および可逆性を持ち,実用的な使用のための重要な属性です.
- ユニークなフォトクロミック特性により,多周波数3D光学メモリおよびフルカラーディスプレイ技術における応用に大きな可能性が示唆されています.
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...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
01:21Polymer Classification: Crystallinity
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
01:24The Seven Crystal Systems: Overview
Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific requirements are not imposed on the...
01:29Crystallographic Point Groups
Crystallographic point groups represent the various symmetry operations that can occur within crystals. They are unique in that at least one point will always remain unchanged during these actions. For instance, consider the triclinic system. This system, devoid of any axis or plane of symmetry, aligns with the C1 and Ci point groups.where Cᵢ is characterized solely by a center of inversion.Contrastingly, the monoclinic system introduces an element of symmetry. This system with one plane and...