Lead(II) complexes with thiodiacetic, oxydiacetic and iminodiacetic acids

Complexes of lead with thiodiacetic, oxydiacetic, and iminodiacetic acids were studied in aqueous solution and in the solid state. In solution, in an acidic medium, only 1:1 complexes were found in all cases. Mixed complexes with hydrogen ion are also formed. The relative formation constants were evaluated at 25°C in 0.5 M NaClO4 by the potentiometric method using a lead amalgam electrode. In the solid state the 1:1 compounds were isolated and characterized. Their probable structure is discussed.