Citation:
MO Xue-Xia, XIE Zheng-Feng, HUI Yong-Hai, HU Jun, LIU Fang-Ming. Synthesis and Fluorescent Properties of Bipyrazoline Compounds[J]. Chinese Journal of Applied Chemistry,
;2007, 24(7): 765-769.
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Five chalcones were synthesized via the aldol condensation reaction of acetophenone or para-substituted acetophenones with 1-phenyl-3-methyl-5-phenoxyl-pyrazol-4-aldehyde,which reacted with two kinds of hydrazine in glacial acetic acid under refluxing to give a series of bipyrazoline derivatives.In this synthetic course,glacial acetic acid is not only a solvent,but also a catalyzer.An optimal yield of 72% was achieved when the reaction was carried out in refluxing.The structures of the compounds were confirmed by means of IR spectrum,1H NMR and elemental analysis.The fluorescent spectra of the prepared compounds show that compounds 3a~3e emits blue fluorescence,the emission wavelength was at about 377 nm.Compounds 4a~4e emits purple fluorescence,the emission wavelength was at about 480 nm.In the fluorescence spectrum,the bipyrazoline compounds of different substituents have diferent fluorescence intensity,compound 4e shows a maximum fluorescence intensity of 4 694.The results show that the compounds may be better fluorescence materials.
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Keywords:
- chalcone,
- bipyrazoline,
- fluorescent compound
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