Papers by Keyword: Pyrazoline

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Authors: Hyo Sim Kang, Sun Wha Oh, Young Soo Kang
Abstract: We prepared various pyrazoline derivatives which possess dimethylamino-, ethoxy-, isopropyl-phenyl ring at the 5-position of pyrazoline. The nanoparticles of pyrazoline derivative ranging from tens to hundreds of nanometers by the reprecipitation method have been successfully prepared and their optical size-dependent properties have been investigated with UV-vis, fluorescence spectroscopy, DLS (Dynamic Light Scattering) and SEM. The size-dependent optical properties of pyrazoline organic nanoparticles have been observed in the order of dimethylamino- > ethoxy- > isopropyl- in electro-donating characters.
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Authors: Huan Mei Guo, Yun Chen Zhang, Yu Feng Li
Abstract: 1N-Acetyl-3-phenyl-5-(3,4,5-trimethoxyl-phenyl)-2-pyrazoline has been synthesized and the crystal structure has been determined by means of single-crystal X-ray diffraction. The pyrazolinyl ring and the phenyl rings at 3 positions of the pyrazoline are almost coplane , with their dihedral angle to be 6.63(2) o. Phenyl ring at 5 positions and pyrazolinyl ring are almost perpendicular, the dihedral angle is 78.03(3) o.
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