Related Experiment Video
Updated: Jun 5, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
Synthesis, characterization and fluorescence studies of 3,5-diaryl substituted 2-pyrazolines
Geeta Joshi nee Pant1, Pramod Singh, B S Rawat
1Department of Chemistry, HNB Garhwal University, Srinagar (Garhwal), Uttarakhand, India. geeta_joshi4f54@rediffmail.com
Abstract:
A series of 2-pyrazolines have been synthesized from α, β unsaturated ketones and hydrazine hydrate with acetic/formic acid in ethanol/DMSO. The structures of 2-pyrazolines have been established by spectroscopic techniques i.e. UV, IR, (1)H NMR, (13)C NMR and micro element analysis. Fluorescence spectra were recorded in the solution at fixed concentration and same excitation wavelength at 290 nm. The absorption band positions of all the compounds broadly lie between 280 and 336 nm and fluorescence band positions in the range between 300 and 370 nm, the near ultraviolet region.
Related Concept Videos
Basicity of Heterocyclic Aromatic Amines
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
Five-Membered Heterocyclic Aromatic Compounds: Overview
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
Variables Affecting Phosphorescence and Fluorescence

