Related Experiment Video
Updated: Jul 4, 2026

Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines
Published on: June 23, 2019
Spectroscopic investigation of 3-pyrazolyl 2-pyrazoline derivative in homogeneous solvents
Smritimoy Pramanik1, Paltu Banerjee, Arindam Sarkar
1Department of Chemistry, Jadavpur University, Kolkata 700032, India.
Abstract:
How solvent conditions such as solvent polarity and hydrogen-bonding affect the fluorescence of a newly synthesized 3-pyrazolyl 2-pyrazoline derivative (Pyz) having pharmaceutical activity has been explored. The solvatochromic effect of Pyz is due to a change in dipole moment of the compound in the excited state. The relaxation of S1 state is perturbed in hydrogen-bonding solvents. The fluorescence properties of the systems are strongly dependent on the polarity of the media. The non-radiative relaxation process is facilitated by an increase in the polarity of the media. The photophysical response of Pyz in different solvents has been explained considering solute-solvent interactions.
More Related Videos
Related Concept Videos
Spectroscopy of Carboxylic Acid Derivatives
In the...
NMR Spectroscopy of Benzene Derivatives
UV–Vis Spectroscopy of Conjugated Systems
One of the factors influencing λmax is the extent of conjugation in the...
IR and UV–Vis Spectroscopy of Aldehydes and Ketones
NMR Spectroscopy of Aromatic Compounds
Chemical Shift: Internal References and Solvent Effects
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...

