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相关概念视频

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.1K
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
2.1K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

12.0K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
12.0K
这页已由机器翻译。其他页面可能仍然显示为英文。View in English
  1. 首页
  3. 研究领域
  5. 工程学
  7. 纳米技术
  9. 分子和有机电子
  11. 通过近红外光可切换的捐赠-接受二烯
  1. 首页
  3. 研究领域
  5. 工程学
  7. 纳米技术
  9. 分子和有机电子
  11. 通过近红外光可切换的捐赠-接受二烯

相关实验视频

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

Published on: November 14, 2015

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通过近红外光可切换的捐赠-接受二烯

Kristin Klaue1, Wenjie Han1, Pauline Liesfeld1

  • 1Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany.

Journal of the American Chemical Society
|June 2, 2020

在PubMed 上查看摘要

概括
此摘要是机器生成的。

研究人员使用二烯开发了新的近红外 (NIR) 分子开关. 这些开关提供了增强的透和减少损坏,使新的光学地址材料成为可能.

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

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Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
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Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch

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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
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科学领域:

  • 有机化学
  • 材料科学
  • 摄影化学

背景情况:

  • 低强度近红外 (NIR) 光为分子开关提供了优势,包括深层组织透和减少辐射损伤.
  • 设计由低能NIR光子激活的可视化系统是一个重大挑战.

研究的目的:

  • 制定直接的一光子NIR光开关的一般设计策略.
  • 合成并研究基于二烯的新型光开关的光热特性.

主要方法:

  • 用对立的供体-受体替代物合成2,7和4,9非替代二烯.
  • 作为替代剂类型,强度,位置和环境极性的函数,对光热特性进行研究.
  • 在深度NIR区域调整激发波长.

主要成果:

  • 在900nm以上实现了最低的光学转换,显著提高了NIR单光子吸收截面 (大小两倍).
  • 在保持循环二烯同位素合理的热稳定性时,最大限度地提高光异构化效率.
  • 可调节的热半衰期从几毫秒到几个小时.

结论:

  • 开发了基于二烯的NIR激活分子开关的成功策略.
  • 合成的光开关具有出色的NIR吸收和可调节的开关特性.
  • 这些发现为非侵入性,可光学定位的材料和系统开辟了道路.