Related Experiment Video
Updated: Jul 3, 2026

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
Published on: February 7, 2022
A Terminal Modification Strategy for Enhancing the Difference in Photoregulated Activity of Azobenzene-Tolfenpyrad
Yongchao Zhang1, Zhi Qiao2, Cuncun Zhou1
1Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China.
Researchers developed novel photoresponsive pesticides using azobenzene ligands. These green pesticides offer tunable activity against specific pests upon light exposure, demonstrating a promising approach for sustainable pest control.
Area of Science:
- Green Chemistry
- Pesticide Design
- Photopharmacology
Background:
- Photopharmacology offers a sustainable strategy for designing environmentally friendly pesticides.
- Azobenzene-modified photochromic ligands were synthesized starting from tolfenpyrad.
- Initial compounds showed good bioactivity but limited photo-switchable differences.
Purpose of the Study:
- To enhance the photoregulatory activity differences of azobenzene-based pesticides.
- To develop high-performance photoresponsive pesticides through rational design.
- To investigate the structure-activity relationship of photochromic ligands.
Main Methods:
- Synthesis of azobenzene-modified photochromic ligands (ABT1-15).
- Evaluation of bioactivity and photoisomerization efficiency against various pests.
- Molecular docking and binding free energy calculations.
- Molecular orbital analysis (HOMO-LUMO gap).
Main Results:
- Compounds ABT7-15 exhibited amplified photoregulatory activity differences.
- ABT14 showed significant photoinduced activity enhancement (4.8x) and reduction (6.6x).
- ABT11 demonstrated a substantial 35-fold photoinduced activity reduction.
- Computational studies indicated enhanced cis-isomer binding and conformational charge distribution changes.
Conclusions:
- Terminal phenyl modifications effectively amplified photoregulatory activity differences.
- The developed compounds represent high-performance photoresponsive pesticides.
- Rational design based on molecular interactions and conformational changes is key for efficacy.
More Related Videos
06:34Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)
Published on: June 20, 2014
07:12Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Related Concept Videos
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Cycloaddition Reactions: MO Requirements for Photochemical Activation
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
Thermal and Photochemical Electrocyclic Reactions: Overview
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Nucleophilic Aromatic Substitution: Elimination–Addition