Related Experiment Video
Updated: Jun 25, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Star-shaped D-pi-A conjugated molecules: synthesis and broad absorption bands
Jin-Liang Wang1, Zheng-Ming Tang, Qi Xiao
1Beijing National Laboratory for Molecular Sciences, College of Chemistry, Peking University, Beijing 100871, China.
Two novel star-shaped D-pi-A molecules were synthesized. Their photoluminescence quantum efficiencies significantly decreased upon incorporating a benzothiadiazole acceptor unit.
Area of Science:
- Organic Chemistry
- Materials Science
- Photophysics
Background:
- Donor-acceptor (D-pi-A) molecules are crucial in organic electronics.
- Star-shaped molecules offer unique electronic and optical properties.
- Tuning molecular structure impacts photophysical characteristics.
Purpose of the Study:
- To synthesize and characterize novel donor-acceptor hybrid star-shaped molecules.
- To investigate the effect of varying donor/acceptor ratios on optical properties.
- To understand the impact of benzothiadiazole incorporation on photoluminescence.
Main Methods:
- Facile synthesis of two D-pi-A molecules (TrTD2A and TrT2DA).
- Absorption and photoluminescence (PL) spectroscopy.
- Structural modification by altering donor/acceptor group ratios.
Main Results:
- Developed two star-shaped D-pi-A molecules.
- Achieved broad visible light absorption spectra for both molecules.
- Observed a dramatic reduction in PL quantum efficiencies in solution after introducing the benzothiadiazole acceptor.
Conclusions:
- The developed D-pi-A molecules exhibit broad absorption.
- Benzothiadiazole incorporation as an acceptor significantly quenches luminescence in these star-shaped molecules.
- Further research is needed to optimize these materials for applications requiring high emission.
More Related Videos
12:08Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
Published on: June 24, 2022
14:11Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
Related Concept Videos
UV–Vis Spectroscopy of Conjugated Systems
One of the factors influencing λmax is the extent of conjugation in the...
π Molecular Orbitals of 1,3-Butadiene
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
UV–Vis Spectroscopy: Woodward–Fieser Rules
Molecular Spectroscopy: Absorption and Emission
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)