Research on restriction effect against oxidizing process of bis-cyclohexyldithiophosphoric cobalt(II)

The restraint ability of pyridine and its derivatives against the oxidation of cobalt(Ⅱ) complex is studied. The oxidizing process of cobalt(Ⅱ) complex is discussed in the bis-cyclohexyldithiophosphoric acid-pyridine solvent extraction system by using the method of spectrophotometry. The oxidizing process of cobalt(Ⅱ) complex can be restrained efficiently by pyridine and its derivatives. The process of restraint against the oxidation of cobalt(Ⅱ)complex is explained. The restraint ability of pyridine and its derivatives against the oxidation of cobalt(Ⅱ)complex are different; the order is established as:4-methylpyridinepyridine3,5-lutidine2,4-lutidine2,4,6-lutidine.