Studies of 1, 5-Bis(3, 4, 5-trimethoxyphenyl)-and 1, 5-Bis(2-methoxy-4-methylphenyl)-3-mercaptoformazans and Their Reactions with Metal Ions

Abstract

1, 5-Bis(3, 4, 5-trimethoxyphenyl)- and 1, 5-bis(2-methoxy-4-methylphenyl)-3-mercaptoformazans have been prepared and characterized, and their reactions with metal ions in a two-phase system are reported. The extraction equilibria of their metal complexes with Cd^II, Co^II, Cu^II, Hg^II, Ni^II, Pb^II, Tl^I and Zn^II as well as their spectral characteristics are also described. The molar absorptivities of Pb^II and Zn^II complexes with 1, 5-Bis(3, 4, 5-trimethoxyphenyl)-3-mercaptoformazan are higher than the corresponding values of their complexes with dithizone. The molar absorptivities of Cu^II and Cd^II complexes with 1, 5-bis(2-methoxy-4-methylphenyl)-3-mercaptoformazan are also higher than the corresponding values of the dithizone complexes. 1, 5-Bis(2-methoxy-4-methylphenyl)-3-mercaptoformazan is more efficient than dithizone in the separation of Cd^II from Zn^II.