Related Experiment Video
Updated: Jan 15, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
Design, Synthesis, and Aggregation-Induced Emission Properties of a Novel D-π-A Conjugated Molecule as a Selective
Omer Cansever1, Guler Yagiz Erdemir2
1Gazi University, Graduate School of Natural and Applied Sciences, Ankara 06560, Türkiye.
Abstract:
In this study, a new D-π-A type conjugated molecule containing N,N-dimethyl donor group and cyanostilbene and dicyanovinyl acceptor groups was designed and synthesized. The molecule exhibited aggregation-induced emission (AIE) property in chloroform-hexane medium; the structure, which gave low fluorescence in solution, showed intense fluorescence under low polarity conditions. In addition, it was observed that the molecule responded selectively and sensitively only to hydrazine compared to various amine compounds (TEA, DEA, aniline, ammonia), thanks to its dicyanovinyl group. A significant hypsochromic shift occurred in the spectrum in the presence of hydrazine, and an increase in fluorescence intensity was observed along with a color change. Furthermore, tests on thin-layer chromatography (TLC) determined that the molecule showed a rapid and visually observable interaction with hydrazine. These results reveal that the designed molecule can be used both in solid-state AIE-enabled optoelectronic applications and as a hydrazine-selective chemical sensor.
Related Concept Videos
Diazonium Group Substitution: –OH and –H
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
Basicity of Heterocyclic Aromatic Amines
Structure of Conjugated Dienes
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...

