Solution Studies on Co(II), Ni(II), Cu(II), and Zn(II) Complexes of Hexamethylenetetramine in Aqueous and Non-Aqueous Solvents

Figure 2

Titration curve of HMTA ligand by KOH (𝐶_L = 10⁻² mol⋅L⁻¹ and 𝐶_OH=0.1 mol⋅L⁻¹): HMTA solution freshly prepared in acidic medium and HMTA solution one week after its preparation in acidic medium.