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鉴于3,5-二磺酸基邻苯二酚与铁(Ⅲ)的络合反应在分析化学上的重要性,已经有不少作者对上述反应进行了详尽的研究,得到大致相同的结果。综述前人的工作,认为铁(Ⅲ)与3,5-二磺酸基邻苯二酚生成组成为1:1,1:2,1:3的三种兰色、紫色和红色的络离子。虽然文献上目前对这三种络离子的化学结构式的看法还不统一,但对络合物的组成中铁(Ⅲ)和3,5-二磺酸基邻苯二酚的克分子比已经是没有分岐的了。不久以前,梁树权等在研究邻苯二酚与铁(Ⅲ)的络合反应中曾报告:在 pH=2时,有一种新的铁(Ⅲ)与邻苯二酚组成的克分子比为2:1的络合物存在。我们考虑到在邻苯二酚的衍生物中亦可
In view of the analytical chemistry importance of the complexation reaction of 3,5-disulfonic acid catechol with iron (III), many authors have conducted exhaustive studies on the above reactions and obtained roughly the same results. Review of previous work, that iron (Ⅲ) and 3,5-disulfonate catechol formation of the composition of 1: 1: 1: 2, 1: 3 three kinds of blue, purple and red complex ions . Although there is currently no consensus on the chemical structure of the three complex ions in the literature, the molar ratio of iron (III) and 3,5-disulfonic acid catechol to the composition of the complex has been absent Differentiation of the. Not long ago, Liang Shuquan and others in the study of catechol and iron (Ⅲ) complexing reaction has been reported: at pH = 2, there is a new iron (Ⅲ) and catechol composition molar ratio of 2 : 1 complex present. We consider that catechol derivatives can also be used