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本文报告铁与隣苯二酚溶液在pH2—12范围内的光吸收曲线(400—800mμ)和用连续变更浓度法在各pH的溶液寻找生成的络合物。除前人已报告的三种络离子(绿色,铁:隣苯二酚=1:1;紫色,1:2;红色,1:3;但该各络合物生成的pH范围与前人略有参差)外,又找出两种新络离子。一为绿黄色阳离子,铁与隣苯二酚之比为2:1,另一为蓝色阴离子,组成比为1:3;虽组成比与已知的红色阴离子相同,但两者可能在电荷数目、离子大小和(或)配位体的数目及种类上不同。在pH4.2—10的溶液中氟不能褪去隣苯二酚铁络离子的颜色,而在较酸的溶液中能褪色。以颜色的稳定度和可测度而论都不及已有的试剂。
In this paper, the light absorption curve (400-800 mμ) of iron and catechol solutions in the pH range of 2 to 12 was reported and the resulting complex was found by continuously varying the concentration of the solution at each pH. In addition to the previously reported three complex ions (green, iron: catechol = 1: 1; purple, 1: 2; red, 1: 3; There are mixed), but also find two new ions. One is a green-yellow cation, iron and catechol ratio of 2: 1, the other is a blue anion, the composition ratio of 1: 3; although the composition ratio and known red anions are the same, but both may charge Number, ion size and / or the number and type of ligands. Fluorine does not fade the color of iron catechol ions in solutions at pH 4.2-10, but fade in more acidic solutions. In terms of color stability and measurability in terms of less than the existing reagents.