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Related Concept Videos

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...
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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

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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.
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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
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...
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Related Experiment Video

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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Efficient UV-matchable light-converting agent based on a space-conjugated di-triarylboron structure.

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.

Chemical Communications (Cambridge, England)
|June 25, 2025
PubMed
Summary

New bis-triarylboron compounds offer improved ultraviolet absorption and high fluorescence quantum yields (FLQY) when incorporated into polymer films. This advancement enhances the performance of light-converting agents for various applications.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Polymer Chemistry

Background:

  • Current light-converting agents suffer from incomplete ultraviolet (UV) absorption and low fluorescence quantum yields (FLQY).
  • These limitations restrict their practical applications in areas requiring efficient light conversion.

Purpose of the Study:

  • To develop novel bis-triarylboron compounds with enhanced photophysical properties.
  • To investigate the potential of these compounds as improved light-converting agents.

Main Methods:

  • Synthesis of novel bis-triarylboron compounds.
  • Doping of synthesized compounds into poly(methyl methacrylate) (PMMA) films.
  • Characterization of UV absorption and fluorescence quantum yields (FLQY).

Main Results:

  • The synthesized bis-triarylboron compounds exhibited highly matched UV absorption profiles.
  • Doped PMMA films displayed significantly high fluorescence quantum yields (FLQY), reaching up to 0.65.
  • The enhanced performance was attributed to the intramolecular space conjugation effect within the compounds.

Conclusions:

  • Bis-triarylboron compounds represent a promising class of materials for light-conversion applications.
  • The intramolecular space conjugation effect is key to achieving high FLQY and efficient UV absorption.
  • These findings pave the way for developing advanced materials with superior light-converting capabilities.