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茜素紫属于酚醌吡喃类酸性染料,它能和一系列金属离子产生显色反应,但其灵敏度、选择性均不够理想,未能引起注意。近年来苏联В.П.АНТОНОВИЧ等人,通过计算并在茜素紫的分子中引入两个溴原子后,使得茜素紫分子的π电子共轭体系得到显著改善。溴代后的茜素紫与高价金属离子的显色反应具有较高的灵敏度,同时还可增强试剂的酸式离解,络合反应可在更酸的区域进行,从而提高了反应的选择性,其可用性也得到很大增加。南开大学沈含熙介绍了二溴
Alizarin violet belongs to phenolic quinone pyran type acid dyes, it can produce a color reaction with a series of metal ions, but its sensitivity and selectivity are not ideal enough, failed to attract attention. In recent years, the Soviet Union В.П.АНТОНОВИЧ and others, through the calculation and the alizarin purple molecules introduced two bromine atoms, making alizarin violet molecules π electron conjugated system was significantly improved. The alizarin violet after bromination has high sensitivity to the color reaction of high-valent metal ions and also can enhance the acid dissociation of the reagent, and the complexation reaction can be performed in a more acidic region, thereby improving the selectivity of the reaction, Its usability has also been greatly increased. Nankai University Shen Hanxi introduced dibromo