Synthesis of silver(II) complexes with heterocyclic nitrogen doner ligands by peroxydisulfate oxidation of silver(I) were studied.
Imidazole(ImH), 2-amino-3-picoline, 2-amino-4-picoline, 2-amino-6-picoline were used as ligands, and ammonium peroxydisulfate as oxydant.
The reaction of silver(I) nitrate and imidazole afforded the white silver(I) imidazolate, AgIm, in aqueous basic solutions.
The reaction of $AgNO_3$ and imidazole with $(NH_4)_2S_2O_8$ formed $[Ag(ImH)_2]_2$ $S_2O_8$ at 0-5℃, and $[Ag(ImH)_3]_2SO_4$ at room temperature.
Among the aqueous reaction mixtures containing $AgNO_3$, amino picolines and $(NH_4)_2S_2O_8$, only 2-amino-4-picoline(ampicol) stabilized silver(II)as $Ag^{Ⅱ}(ampicol)_2SO_4$. In the case of 2-amino-3-picoline, the ligand disruption occurred and these products did not contain silver(II). 2-amino-6-picoline formed salts with $(NH_4)_2S_2O_8$.
The spectral and magnetic properties of the resultant Ag complexes were also studied.
