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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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非合聚合物使太阳能水氧化成为可能

Shuo Hou1, Huawei Xie2, Fang-Xing Xiao1,3

  • 1College of Materials Science and Engineering, Fuzhou University, New Campus,Minhou, Fujian Province 350108, China.

Inorganic chemistry
|May 2, 2024
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概括

非合聚合物现在可以调解金属氧化物中的电荷传输,用于太阳能水氧化. 用分支聚乙烯胺 (BPEI) 封装金属氧化物可增强电荷转移,分离和寿命,改善光电化学性能.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 光催化作用的光催化

背景情况:

  • 结合聚合物因其分子结构而促进电荷转移.
  • 不结合的聚合物以前被认为是无法携带电荷的,这限制了它们在太阳能应用中的使用.
  • 有效的电荷分离和运输对于有效的太阳能水氧化至关重要.

研究的目的:

  • 研究非结合聚合物的潜力,作为金属氧化物基础的光电化学系统中的电荷传输介质.
  • 探索非合聚合物可以增强太阳能水氧化的机制.
  • 为了证明这种方法的普遍适用性.

主要方法:

  • 用超薄分支聚乙烯胺 (BPEI) 封装金属氧化物 (TiO2,WO3,Fe2O3,ZnO).
  • 光电化学 (PEC) 测量以评估水的氧化活性.
  • 接口收费运输分析以阐明BPEI的作用.

主要成果:

  • BPEI封装显著提高了对金属氧化物活性部位的单向电荷传递.
  • BPEI促进了缺陷的产生,增强了电荷分离,延长了电荷载体的寿命.
  • 在使用BPEI修饰的金属氧化物时,观察到PEC水氧化活动的改善.
  • BPEI充当了一个洞撤回调解员,促进了空缺的产生,并指导了充电流.

结论:

  • 非合聚合物,特别是BPEI,可以有效地调解金属氧化物中的电荷传输,用于太阳能水氧化.
  • 这种方法克服了非合聚合物在太阳能转换中的局限性.
  • 这些发现为在光催化和能源应用中利用非合聚合物打开了新的可能性.