In order to study the mechanism of interaction of 4-(2-thiazolylazo)catechol with natural sulfides specifically with sulfides of various metals, the complexation of this azo compound with copper(II), cobalt(II), nickel(II), and zinc(II) ions in aqueous solutions was investigated. The reagent forms positively charged complexes with metal ions in the range of pH = 5.8—11.1. Their composition and structure, range of existence and stability constants were determined. An anionic complex with copper(II) formed at pH = 12.3—13.2. The structure of surface complex compounds formed on metal sulfides was proposed.

中文翻译：

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研究 4-(2-thiazolylazo) 儿茶酚与 CuII、CoII、NiII 和 ZnII 离子在水溶液中的络合，作为研究它们与天然硫化物相互作用的方法

为了研究 4-(2-thiazolylazo) 邻苯二酚与天然硫化物特别是各种金属硫化物的相互作用机理，该偶氮化合物与铜 (II)、钴 (II)、镍 (II) 和研究了水溶液中的锌 (II) 离子。该试剂在pH = 5.8-11.1范围内与金属离子形成带正电荷的络合物。确定了它们的组成和结构、存在范围和稳定性常数。在 pH = 12.3-13.2 时形成与铜 (II) 的阴离子络合物。提出了在金属硫化物上形成的表面络合物的结构。