Synthesis and spectroscopic investigation of fluorescent compounds containing bis-pyrazole ring
- Vol.58(B), Jan.
- New Delhi CSIR 2019
- 75-87p.
A series of novel fluorescent compounds containing bis-pyrazole ring have been synthesized using 1-aryl-3-methylpyrazol-5-ones and 1-aryl-3,5-dimethylpyrazol-4-carbaldehydes as the starting materials. The synthesized compounds have been characterized by means of 1H NMR, IR, mass spectrometry and elemental analysis, and their ultraviolet–visible light (UV-Vis) absorption behavior and fluorescent properties have also been measured. At the same time, the molecular structure of compound B1 has been determined by single crystal X-ray diffraction. Moreover, the effect of acetic acid on the spectroscopic properties of the synthesized products has been examined using compounds A5 and B1 as examples. It has been found that all synthetic fluorescent compounds show two remarkable absorption peaks in a wavelength range of 250-254 nm and 360-380 nm; and their maximum emission peaks emerge around 323 nm. Besides, acetic acid leads to changes in the acidity of the medium thereby influencing the UV–Vis absorption spectra and fluorescent spectra of the synthesized compounds.