新型蓝光吡唑啉荧光化合物的合成与红外光谱研究

用已合成的苯并噻唑吡唑啉类化合物作为参考［1,2］，依据Schellhammer经验中化学结构与荧光性关系，在吡唑啉的1-位引入了苯并噻唑基或苯并咪唑基，3-位引入苯基衍生物，使其具有荧光性，5-位引入苯基作为助色团，可使荧光谱红移。考虑3-位苯环上若带有—NH₂的吡唑啉化合物有利荧光性的提高，设计合成了两种目前国内外均未见报道的带有—NH₂的苯并噻唑及苯并咪唑吡唑啉化合物，经荧光检测证明其荧光性能受—NH₂的影响有所增强，荧光发射波长处在蓝绿光的范围内，是两种新型蓝光荧光化合物。经红外光谱分析，确定了带有—NH₂的苯并噻唑基或苯并咪唑基取代的吡唑啉类化合物具有的典型特征吸收峰，确证了化合物的结构。为利用红外光谱分析此类新型化合物的结构提供了便捷的方法。

Synthesis of New Blue Pyrazoline Fluorescent Compounds and Study of Infrared Spectroscopy

According to Schellhammer theory of the relation between chemical structure and fluorescent quality, and referring to the synthesized benzothiazolyl pyrazoline compounds, the authors designed 1-benzimidazolyl or 1-benzothiazolyl, 3-phenylic derivatives, which posses fluorescent property. The authors introduced 5-phenyl as auxochrome group which can make fluorescence spectrum bathochromic. If there were -NH2 in the benzene ring, the fluorescence would be increased. Two kinds of benzimidazolyl and benzothiazolyl compounds with -NH2 were synthesized which were not reported. The determination of fluorescence proved that its fluorescence strength is better. The fluorescence emission wavelength is in the region of green-blue light, and there are two kinds of blue light fluorescence compounds. All these compounds were characterized by elemental analysis and infrared spectroscopy. The characteristic peaks of the absorption spectra of these compounds were found by IR spectral analysis. The compound structure was determined.