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茜素紫属于呫吨类酸性显色剂。它能与一系列金属离子产生有色反应。但是,反应灵敏度与选择性均不够理想。如果在茜素紫分子中引入卤素吸电子基团,则有可能使分子的π电子共轭体系得到显著改善。同类型化合物电子结构的量子化学计算证实,茜素紫的溴代衍生物对高价金属离子可能具有较高的灵敏度。同时,吸电子基的引入,还可增强试剂的酸式解离,使络合反应移向
Alizarin violet belongs to xanthone class acid developer. It produces a color reaction with a series of metal ions. However, the reaction sensitivity and selectivity are not ideal. If the alizarin violet molecules introduced halogen electron-withdrawing group, it is possible to make the molecular π conjugated system was significantly improved. Quantum chemical calculations of the electronic structures of the same type of compounds confirm that alizarin violet brominated derivatives may have higher sensitivity to higher valent metal ions. At the same time, the introduction of electron-withdrawing groups can also enhance the acid-dissociation of the reagents and shift the complexation reaction