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2,3,7-三羟基-9-取代基萤光酮是胶束增敏分光光度法中的一类高灵敏显色剂,有关这类试剂的研究与应用已有大量文献报导。但其中较好的仍只限于水杨基萤光酮等少数几个,其选择性也还不甚理想,且总的是以扩大应用为多,新开发的试剂较少。我们合成了九个9-取代萤光酮试剂,其中2,4-二氯苯基萤光酮、4-羟基-3-甲氧基苯基萤光酮、3,4-二甲氧基苯基萤光酮、对氨基苯基萤光酮等尚未见有应用于元素分析的报导。这些试剂均能与铌显色。在初步筛选后,又选出在强酸性溶液中显色与弱酸性条件下显色的优良试剂各一个,进行了各种表面活性剂的匹配对比,最后选出2,4-二氯苯基萤光酮。其灵敏度与稳定性等都与水杨基萤光酮相当,更适于在强酸介质中进行测定,从而选择性要优于水杨基萤光酮、二溴苯基萤光酮、苯基萤光酮。表面活性剂对比的结果,仍以CTMAB匹配为最好。
The 2,3,7-trihydroxy-9-substituent fluorone is a kind of highly sensitive chromogenic reagent in micelle-sensitometric spectrophotometry. The research and application of these reagents have been reported widely in the literature. However, the better ones are still limited to the few such as salicylfluorone, and their selectivity is still not very satisfactory. In general, there are more applications for expansion and less newly developed reagents. We synthesized nine 9-substituted fluorone ketones, of which 2,4-dichlorophenylfluorone, 4-hydroxy-3-methoxyphenylfluorone, 3,4-dimethoxybenzene Fluoride-based, p-aminophenylfluorone have not been reported for elemental analysis. These reagents can color with niobium. After the initial screening, we also selected one of the excellent reagents for color development under weakly acidic conditions in strong acid solution, and compared and matched the various surfactants. Finally, 2,4-dichlorophenyl Fluorescent ketone. Its sensitivity and stability are comparable to those of salicylfluorone, which are more suitable for determination in strong acid medium. Therefore, the selectivity is better than salicylfluorone, dibromophenylfluorone and phenylfluorone. Surfactant comparison results, still CTMAB match for the best.