オリゴビオロゲンの折りたたみは,ラジカル-ラジカル相互作用によって誘発される
Yuping Wang1, Marco Frasconi, Wei-Guang Liu
1Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.
Journal of the American Chemical Society
|December 11, 2014
まとめ
オリゴビオロゲンは,ラジカル・カチオンを持つオリゴビオロゲンは,ラジカル・ラジカル相互作用によって誘発される折り畳みを通じて自己組織化します. これらの相互作用は,分子内および分子間構造の両方に影響を及ぼし,二次および三次構造を持つバイオミメティックシステムを生み出します.
科学分野:
- 超分子化学 超分子化学
- 材料科学 材料科学とは
- 有機化学 オーガニック・ケミストリー
背景:
- バイオゲンは,その酸化還元活性と自己組織化特性で知られている.
- 自己組み立てメカニズムの理解は,機能的な材料の設計に不可欠です.
- オリゴビオロゲンは,分子相互作用を研究するために調節可能な構造を提供します.
研究 の 目的:
- 異なる4,4'-ビピリジニウム (BIPY(2+)) 単位で同類のオリゴビオロゲンを合成する.
- 根性カチオンの形態の自己組み立て行動を調査する.
- 折り畳みと上層構造の形成における根幹対根幹相互作用の役割を明らかにする.
主な方法:
- オリゴビオロゲンの合成で,p-キシリレンブリッジを用いる.
- 電子的な特徴付けのためのUV/Vis/NIRスペクトロスコーピー.
- 量子力学の洞察のための密度関数理論 (DFT) 計算.
- 構造分析のための固体X線結晶学.
主要な成果:
- オリゴビオロゲンの折り畳みは,BIPY (BIPY) の単位間のラジカル-ラジカル相互作用によって誘発されます.
- 短いオリゴヴィオロゲンは,分子間相互作用が支配する折り畳みを示しています.
- より長いオリゴビオロゲンは,分子内および分子間相互作用の両方によって影響される折り畳みを示し,NIR吸収は900 nmで.
- 固体構造は,分子間相互作用によって安定した二重体形成と柱状の積み重ねを明らかにします.
結論:
- ラジカル対ラジカル相互作用は,オリゴヴィオロゲンの自己組み立てと折り畳みの主要な原動力である.
- この研究は,核酸とタンパク質の構造を模倣する人工バイオミメティックシステムを提示しています.
- 発見は,調節可能な性質を持つ自己組み立て分子システムの設計に関する洞察を提供します.
関連する概念動画
Radical Reactivity: Overview
3.0K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
3.0K
Radical Formation: Overview
2.8K
A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
2.8K
Radical Formation: Elimination
2.4K
Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions...
2.4K
Radical Formation: Homolysis
4.7K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
4.7K
Radical Formation: Addition
2.4K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
2.4K
Radical Reactivity: Nucleophilic Radicals
2.8K
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
2.8K


