デンドロニズドペリレンビシミドの自己組み立てにより,複雑な螺旋状の柱を形成する
Virgil Percec1, Mihai Peterca, Timur Tadjiev
1Roy & Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA. percec@sas.upenn.edu
Journal of the American Chemical Society
|June 25, 2011
まとめ
デンドロニズドペリレンビシミドは,自己組み立てにより,順番に並んだ柱状の相を形成する. 分子配列は,テトラメリックまたはヘリケール形であっても,リンク器の長さに依存し,有機電子学の潜在力に影響を与えます.
科学分野:
- 材料科学 材料科学とは
- 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:
- ペリレン3,4:9,10-テトラカルボキシル酸ビシミド (PBIs) は,重要な有機半導体である.
- デンドロニゼーションは,PBIの自己組み立てと材料特性を制御する経路を提供します.
- 構造と性質の関係を理解することは,高度なアプリケーションの鍵です.
研究 の 目的:
- 第1世代のデンドロニズドPBIsのシリーズを合成し,特徴づけること.
- メチレン単位の長さ (m) が自己組み立て行動に及ぼす影響を調査する.
- オーガニック・エレクトロニクスにおけるこれらの材料の潜在能力を探求する.
主な方法:
- 異なる"m"値で (3,4,5) 12G1-m-PBIを合成する.
- 微分スキャン熱計 (DSC) とX線微分を用いた構造分析.
- 固体 (1) H NMRとオリエンテッドサンプルでの分子モデリング.
主要な成果:
- 高温自己組み立ては,2D六角形の柱状相を生成する.
- 低温の自己組み立ては,3Dの柱状配列を形成します:オーソロンビック (m=0,2,3,4) とモノクリニック (m=1).
- オーソロンビック・フェーズは,分子指向が異なるテトラメリック・ユニットを特徴としており,モノクリニック・フェーズは,分子が並んだ螺旋状の繰り返しを示している.
結論:
- メチレン結合体の長さは,柱状の自己組み立て構造を大きく左右する.
- モノクリニックの螺旋状構造 (m=1) は,他の相と比較して強化された π スタッキングを促進します.
- これらの発見は,有機電子機器と太陽電池のためのデンドロニズドPBIsの設計に関連しています.
関連する概念動画
01:32Assembly of Complex Microtubule Structures
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
02:41Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
00:57Formation of Intermediate Filaments
Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been reported.
01:16Structure of Conjugated Dienes
Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...