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相关概念视频

Phosphodiester Linkages01:01

Phosphodiester Linkages

Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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 generated carbocation,...
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...

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相关实验视频

Updated: Jul 10, 2026

Micropunching Lithography for Generating Micro- and Submicron-patterns on Polymer Substrates
09:24

Micropunching Lithography for Generating Micro- and Submicron-patterns on Polymer Substrates

Published on: July 2, 2012

高分子p-n-heterojunctions通过同自组织的oligo(p-phenylene vinylene) 和二烯 bisimide染料.

Frank Würthner1, Zhijian Chen, Freek J M Hoeben

  • 1Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany. wuerthner@chemie.uni-wuerzburg.de

Journal of the American Chemical Society
|August 26, 2004
PubMed
概括

与气结合的染料阵列形成了性超结构,使得高效的光诱导电子转移成为可能. 这些超分子系统显示出作为功能纳米单元的潜力,可用于先进的应用.

更多相关视频

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
06:49

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

Published on: March 2, 2021

相关实验视频

Last Updated: Jul 10, 2026

Micropunching Lithography for Generating Micro- and Submicron-patterns on Polymer Substrates
09:24

Micropunching Lithography for Generating Micro- and Submicron-patterns on Polymer Substrates

Published on: July 2, 2012

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
06:49

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科学领域:

  • 超分子化学 超分子化学
  • 材料科学 材料科学 材料科学
  • 有机电子 有机电子

背景情况:

  • 供体-接受体染料阵列对于有机电子非常重要.
  • 控制超分子组合会影响材料的特性.
  • 基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基

研究的目的:

  • 为了比较键和共键的OPV-PERY染料阵列.
  • 为了研究这些阵列的自组装和手术性能.
  • 探索它们作为功能纳米单位的潜力.

主要方法:

  • 合成有键和有共键的OPV-PERY染料阵列.
  • 在甲基环中形成的J型聚合物.
  • 循环二极化 (CD) 光谱法用于分析奇拉性.
  • 原子力显微镜 (AFM) 用于固态超结构.

主要成果:

  • 这两种系统都形成了J型聚合物,但只有联数组产生了层次的性超结构.
  • 在溶液中观察到左侧螺旋pi-pi联合聚合物.
  • 右侧的纳米级超级线圈在固态中形成.
  • 在溶液中的聚合物稳定性随OPV结合长度的增加而增加.
  • 光诱导的电子转移发生在亚皮秒时间尺度上.

结论:

  • 有键的OPV-PERY阵列自组装成层次的性超结构.
  • 这些超分子实体表现出高效的光诱导电子转移.
  • 这些发现表明它们作为光电子应用中的功能纳米单元的实用性.