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Related Concept Videos

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

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Related Experiment Video

Updated: Jun 24, 2026

Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
07:44

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Published on: July 6, 2016

Addressing the Trade-off in Long π-Bridge Dyes: Performance Optimization by Site-Specific Alkyl Chain Engineering.

Haiping Li1, Zongxue Wang2, Xing Hu1

  • 1School of Chemistry and Life Science, Changchun University of Technology, Changchun, Jilin, 130012, P. R. China.

Journal of Fluorescence
|June 22, 2026
PubMed
Summary
This summary is machine-generated.

Extending the π-conjugated bridge in dyes enhances light absorption but reduces charge transfer. Site-specific alkyl substitution creates a steric fence, improving dye performance without compromising electron injection efficiency.

Keywords:
Aggregation SuppressionCharge RecombinationDye-sensitized Solar cellsSite-Specific Alkyl Chain EngineeringTheoretical Studyπ-Bridge

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Published on: October 24, 2017

Area of Science:

  • Materials Science
  • Photochemistry
  • Computational Chemistry

Background:

  • Donor-π-acceptor dyes are crucial for light harvesting in solar cells.
  • Extending the π-conjugated bridge enhances light absorption but often degrades charge-transfer performance.
  • Triphenylamine-cyanoacrylic acid dyes with thiophene bridges are investigated for photovoltaic applications.

Purpose of the Study:

  • To investigate the impact of π-conjugated bridge extension on dye performance.
  • To explore site-specific alkyl-chain engineering as a strategy to overcome performance trade-offs.
  • To analyze the electronic and structural effects of bridge length and alkyl substitution on dye properties.

Main Methods:

  • Density Functional Theory (DFT) and Time-Dependent DFT (TD-DFT) calculations.
  • Investigation of triphenylamine-cyanoacrylic acid dyes with varying thiophene bridge lengths (T1-T4).
  • Application of site-specific alkyl-chain engineering on a tetra-thiophene scaffold.

Main Results:

  • Bridge extension red-shifts absorption maxima but delocalizes electron density, weakening interfacial performance.
  • Site-specific alkyl substitution creates a steric fence, suppressing π-π stacking and charge recombination.
  • Alkylated dyes maintain ultrafast electron injection and near-unity injection efficiency, proving electronic decoupling.

Conclusions:

  • Site-specific alkyl-chain engineering effectively mitigates the trade-off between light harvesting and charge transfer in long-bridge dyes.
  • This strategy enhances dye stability and regeneration thermodynamics.
  • The findings provide a pathway for designing high-performance organic dyes for solar cells.