通过使用宿主稳定电荷转移相互作用,设计了分子项链的自组装
Young Ho Ko1, Kyungpil Kim, Jin-Koo Kang
1National Creative Research Initiative Center for Smart Supramolecules, and Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, San 31 Hyojadong, Pohang 790-784, Republic of Korea.
Journal of the American Chemical Society
|February 20, 2004
概括
研究人员使用库库比图里尔 (CB[8]) 主机-客机化学方法实现了第一个分子项链的定量自组装. 这一突破使得从简单的组件中精确构建复杂的超分子架构.
科学领域:
- 超分子化学 超分子化学
- 有机合成 有机合成
- 材料科学 材料科学 材料科学
背景情况:
- 非共价合成对于创建复杂的分子架构至关重要.
- 主客复杂化为分子自我组装提供了一个强大的策略.
- 以前合成分子项链的方法缺乏定量控制.
研究的目的:
- 开发一种用于分子项链的非共价合成的新型定量方法.
- 为了证明一个复杂的分子项链 ([6]MN) 从多个组件的自我组装.
- 探索宿主-客人相互作用在指导超分子组装中的作用.
主要方法:
- 作为一个分子宿主,利用了库库比特[8]uril (CB[8]).
- 设计了一种客分子,电子供体和受体单元由刚性结构连接在一起.
- 采用宿主稳定型分子间电荷转移 (CT) 复合体形成来驱动自我组装.
- 实现了一个周期性寡合体的定量自我组装.
主要成果:
- 成功合成了第一个量化自组装分子项链,[6]MN.
- [6]MN结构由五个小客环组成,连接到一个大环框架上.
- 五个cucurbit[8]uril (CB[8]) 分子被接到客人框架上,形成了一个类似螺旋的排列.
- 由此产生的分子项链直径约为3.7nm,厚度为1.8nm.
结论:
- 开发的宿主-客人策略使复杂分子项链的定量非共价合成成为可能.
- 由CB稳定的分子间电荷转移相互作用[8],是形成循环框架的关键.
- 这项工作为设计和建造复杂的超分子结构提供了一个新的平台.
相关概念视频
01:28Electron Transport Chains
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
The ETC is comprised of...
01:04Anionic Chain-Growth Polymerization: Mechanism
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.