超分子キラルポリマーから作られた有機形態の溶媒成形
Luka Đorđević1, Tomas Marangoni1, Tanja Miletić1
1†Department of Chemical and Pharmaceutical Sciences, INSTM UdR Trieste, University of Trieste, Piazzale Europa 1, 34127 Trieste, Italy.
Journal of the American Chemical Society
|May 21, 2015
まとめ
研究者らは,ウラシル結合BINOLとOPEの分子がどのように自己組み立てられ,多様なナノ構造を形成するかを調査した. 溶媒の性質が形態論を決定し,螺旋状の構造は顕微鏡レベルでキラリティを独特に示す.
科学分野:
- 超分子化学 超分子化学
- 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
背景:
- 自己組み立てと自己組織化は,複雑な分子構造を創造する根本的なプロセスである.
- キラル認識とキラルナノ構造の形成は,高度な材料と生物学的応用において極めて重要です.
研究 の 目的:
- uracil-conjugated enantiopure (R) -または (S) -1,1'-binaphthyl-2,2'-diol (BINOL) とoligo(p-phenylene ethynylene) (OPE) 染色体の自己組み立て行動を調査する.
- 溶媒の性質が有機ナノ構造の形成と形態にどのように影響するかを理解する.
主な方法:
- 紫外線,円形の二重化 (CD),光,核磁共振 (NMR) を含むスペクトル検査技術.
- 構造分析のための小角X線散射 (SAXS).
- トランスミッション電子顕微鏡 (TEM) や原子力顕微鏡 (AFM) などの顕微鏡法.
- 分子モデリングシミュレーション.
主要な成果:
- BINOLとOPEのユニット間のトリプルH結合認識は,自己組み立てを推進する.
- 様々なナノ構造 (球状,棒状,繊維状,螺旋状) の形成は,溶媒の溶媒恐怖性に左右される.
- 螺旋型のナノ構造は,顕微鏡のキラリティを示す唯一のものであった.
- SAXSとモデリングは,超巻き二次元二重ケーブルテープで構成された螺旋形の上部構造を明らかにしました.
結論:
- H結合,溶媒の蒸気圧,およびソルボホービック/ソルボホービック相互作用の相互作用がナノ構造の形成を統制する.
- チラリティは,特定の螺旋状の上部構造で顕微鏡レベルで表現されます.
- この研究は,キラル・スーパモレキュラー・アセンブリの設計と制御に関する洞察を提供します.
関連する概念動画
01:26Polymer Classification: Stereospecificity
3.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
3.4K
01:20Anionic Chain-Growth Polymerization: Overview
2.8K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.8K
01:00Characteristics and Nomenclature of Homopolymers
4.3K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
4.3K
01:21Polymer Classification: Crystallinity
4.3K
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...
4.3K
01:17Ziegler–Natta Chain-Growth Polymerization: Overview
4.3K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
4.3K
00:57Cationic Chain-Growth Polymerization: Mechanism
3.1K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
3.1K