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相关概念视频

UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

7.4K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent...
7.4K
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

25.7K
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
25.7K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

4.8K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
4.8K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.9K
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
1.9K
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

3.7K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
3.7K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.1K
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.
Removing one hydrogen from the intervening CH2 group...
3.1K

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相关实验视频

Updated: Sep 18, 2025

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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有效的紫外线匹配的光转换剂,基于空间结合的二三博结构.

Zhen Wang1, Yuxuan Yang1, Luohan Fang2

  • 1State Key Laboratory of Applied Organic Chemistry (Lanzhou University), Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou Magnetic Resonance Center, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China. suncl@lzu.edu.cn.

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概括

新的 bis-triarylboron 化合物在被纳入聚合物薄膜时提供了更好的紫外线吸收和高光量子产量 (FLQY). 这一进步提高了各种应用的光转换剂的性能.

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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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科学领域:

  • 材料科学 材料科学 材料科学
  • 摄影化学的使用.
  • 聚合物化学 聚合物化学

背景情况:

  • 目前的光转换剂有不完全的紫外线 (UV) 吸收和低光量子产量 (FLQY).
  • 这些局限性限制了它们在需要高效光转换的领域的实际应用.

研究的目的:

  • 开发具有增强光物理性质的新 bis-triarylboron 化合物.
  • 研究这些化合物作为改进的光转换剂的潜力.

主要方法:

  • 新型 bis-triarylboron 化合物的合成.
  • 合成化合物的兴奋剂在聚甲基酸 (PMMA) 薄膜中.
  • 紫外线吸收和光量子产量的表征 (FLQY).

主要成果:

  • 合成的 bis-triarylboron 化合物表现出高度匹配的紫外线吸收配置文件.
  • 杂的PMMA薄膜显示出显著高的光量子产量 (FLQY),达到0.65.
  • 增强的性能归因于化合物内部的分子内空间结合效应.

结论:

  • 双三博化合物是用于光转换应用的有希望的材料类.
  • 内部分子空间结合效应是实现高FLQY和高效紫外线吸收的关键.
  • 这些发现为开发具有卓越光转换能力的先进材料铺平了道路.