司帕沙星氯代物的制备及荧光性质研究

司帕沙星在酸性介质中与亚硝酸反应 ,其重氮盐在氯化亚铜存在下 ,继而与氢氯酸反应生成一种较司帕沙星荧光响应值高 1 1 0倍的强荧光物质 ,采用元素分析、红外光谱和质谱对其衍生物的结构进行了表征。结果表明 ,司帕沙星的荧光强度与其喹啉环 5 位上的氨基密切相关 ,本文还对司帕沙星的荧光自猝灭及氯代荧光增敏机理进行了探讨。

Preparation of Chloro-sparfloxacin and Its Fluorescence Behavior

Sparfloxacin (SPFX) can be oxidized by nitrous acid then react with chlorohydric acid further to form a strong fluorescence substance in acid media. The molecular structure is identified by elemental analysis, IR, MS and fluorescence spectra. The emission properties of sparfloxacin and chloro-sparfloxacin are greatly distinct, the fluorescence of sparfloxacin is so weak that it can not be determined by means of fluorescence spectra, but the fluorescence intensity of the new substance is 110 fold more than that of sparfloxacin itself. With quinine sulfate (0.05 mol.L-1 of H2SO4, phi f = 0.55) as standard solution, the fluorescence quantum production rate of SPFX and this new fluorescence were determined as 0.0072 and 0.1539, respectively. By this, a new sensitive method for the determination of SPFX tablets by fluorescence spectroscopy is presented with good result. The recovery of method is 97.2%. RSD is 1.6%. Finally, the fluorescence self quenching and chloro-sparfloxacin enhancement mechanism of sparfloxacin are explored in detail.