Potentiometric Studies of Some 1-(4-Substituted)-1,3,5-Triazino-3-Methyl Thiocarbamide Complexes of Co2+, Ni2+ and Cu2+

Abstract

The interactions of Co(ll), Ni(II) and Cu(II) with 1-(4-hydroxy)-1,3,5-
triazino-3-methyl thiocarbamide and 1-(4-hydroxy-6-methyl)-1,3,5-
triazino-3-methyl thiocarbamide have been investigated potentiometrically
in 70% dioxane-water mixture at constant ionic strength. Bjerrum's potentiometric
titration method as adopted by Calvin and Wilson is applied in
the present work. Proton ligand and metal-ligand stability constants have
been determined by Irving-Rossotti's expression at (27 ± 0.1^oC). The pK
values are determined by half integral method and by pointwise calculations.
The chelation properties can be related to the metal ion. The relative
stabilities of the complexes of the bivalent metal ions have been verified.