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相关概念视频

Anionic Chain-Growth Polymerization: Overview01:20

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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,...
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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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...
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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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Anionic Chain-Growth Polymerization: Mechanism01:04

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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...
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基于 thiabicyclononane 的抗菌多种药物

Zhishuai Geng1, M G Finn1

  • 1School of Chemistry & Biochemistry, Georgia Institute of Technology , 901 Atlantic Drive, Atlanta, Georgia 30332, United States.

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概括
此摘要是机器生成的。

新的双环[3.3.1]非 (BCN) 聚合物即使在低度下也显示出强大的抗菌活性. 这些新型聚合物在功能化的表面上也表现出有效性, 提供了对抗细菌生长的多功能应用.

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科学领域:

  • 聚合物化学
  • 材料科学
  • 抗微生物剂

背景情况:

  • 自行车[3.3.1]非 (BCN) 结构提供独特的分子架构.
  • 多种菌因其潜在的抗菌性质而闻名.
  • 开发具有高疗效和选择性的新型抗菌剂至关重要.

研究的目的:

  • 合成基于双环[3.3.1]非 (BCN) 的新型聚合物.
  • 评估这些新聚离子的抗菌活性和选择性.
  • 在功能化表面上探索 BCN 聚合物的应用,以对抗细菌.

主要方法:

  • 通过 thiabicyclo[3.3.1]nonane dinitrate 与 bis ((pyridine) 核的反应合成 BCN 聚.
  • 模块化合成允许功能化和可变长度的链接器.
  • 使用铜催化酸循环添加的聚合后修饰.
  • 对抗细菌生长和静态细胞的抗菌疗效测试.
  • 红细胞溶解测定用于选择性评估.
  • 固体基板 (玻璃,) 用 BCN 聚合物的功能化.

主要成果:

  • 成功合成了中等链长的新型BCN聚.
  • 聚合物显著抑制细菌生长 (μg/ mL) 和杀死静态细胞 (ng/ mL).
  • 对红细胞溶解具有中等到良好的选择性.
  • 开发的聚合物显示细菌的耐药性发展缓慢.
  • 可降解的BCN聚增加了大肠杆菌对其他抗菌剂的敏感性.
  • 功能化的表面表现出重复杀死细菌的能力.

结论:

  • BCN聚是一种有前途的新型聚烯抗菌剂.
  • 这些聚合物具有强大和选择性的抗菌活性.
  • 表面固定的 BCN 聚合物为各种基板的细菌控制提供了持久的解决方案.