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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. shu

Synthesis and Fluorescent Properties of Bipyrazoline Compounds

1.
a College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046;
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b Hangzhou Teachers College, Hangzhou

Corresponding author: LIU Fang-Ming,
Received Date: 6 August 2006
Available Online: 20 November 2006
Fund Project: 国家自然科学基金(20562011) (20562011)

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.
- chalcone,
- bipyrazoline,
- fluorescent compound
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