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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

3.3K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Pentagonal/Heptagonal-Lock Strategy Enables Narrowband Red Multiple Resonance Emitters Through Temperature-Controlled

Jiahao Zhang1, Jiahui Liu2, Zhenlong Li1

  • 1Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P.R. China.

Angewandte Chemie (International Ed. in English)
|November 3, 2025
PubMed
Summary

A new naphthalene-based strategy achieves significant red-shifted emission in multiple resonance (MR) emitters. This method maintains narrow bandwidths, enabling high-performance red organic light-emitting diodes (OLEDs) with excellent efficiency.

Keywords:
Multiple resonanceNarrowband red emissionOrganic light‐emitting diodesPentagonal and heptagonal lockΠ‐extension strategy

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • π-extension is key for red-shifted emission in multiple resonance (MR) emitters.
  • However, π-extension often causes spectral broadening, hindering high-performance red MR material development.

Purpose of the Study:

  • To develop a novel π-extension strategy for red-shifted emission with narrow bandwidth.
  • To enable broad color tuning by adjusting molecular orbital energy gaps.

Main Methods:

  • A naphthalene-based pentagonal/heptagonal-lock π-extension strategy was employed.
  • Precise π-extension was achieved via controlled Scholl reactions at varying temperatures, forming sequential pentagonal and heptagonal rings.

Main Results:

  • A significant redshift of 116 nm was achieved while maintaining a narrow emission bandwidth.
  • A red fluorescent emitter with a 600 nm emission peak and 30 nm full-width-at-half-maximum was obtained.
  • Organic light-emitting diode (OLED) devices demonstrated a high external quantum efficiency of 21.3% with minimal efficiency roll-off.

Conclusions:

  • The developed π-extension strategy effectively achieves red-shifted emission with narrow bandwidths.
  • This approach facilitates color tuning and leads to high-performance red OLEDs.
  • The method offers a promising route for designing advanced organic electronic materials.