Microwave assisted synthesis, spectroscopic and photophysical properties of novel pyrazol-3-one containing push -pull chromophore

摘要

The present work deals with synthesis of pyrazole-3-one containing Schiff base as a push-pull chromophore and its photophysical studies. The title compound 4-((9-ethyl-9H-carbazol-3-yl) methylene) amino-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one (EDPO) derived from the reaction of 9-ethyl-3-carbazole carboxaldehyde with 4-amino phenazone under microwave irradiation for 4 min achieving 94.8% yield. The structure of chromophore (EDPO) was established on the basis of elemental analysis and spectroscopic techniques. Photophysical properties such as transition dipole moments, stokes shift, oscillator strength and fluorescence quantum yields was investigated in ten different solvents. It was observed that the intensity of the absorbance and emission of EDPO increased on the basis of the solvent polarity (n-Hexane to DMSO). In addition the effect of the surfactants CTAB and SDS on the EDPO were also studied to determine the critical micelle concentration of the cationic and anionic surfactants CTAB and SDS. (C) 2019 Published by Elsevier B.V.