Abstract
The complex-formation equilibria of mercury(II) with penicillamine have been investigated in acidic and neutral conditions. A liquid–liquid extraction method using dithizone as auxiliary ligand was applied for the determination of the stability constants of three differently protonated 1:2 metal/ligand complexes formed at pH<3. Evidence has been found by potentiometry and confirmed by Raman spectroscopy for the existence of 1:3 metal/ligand complex besides 1:1 and 1:2 species at pH>4. The stability constants of HgL 3H 3 − and HgL 2H − complexes as well as the macroscopic protonation constants of the ligand were determined from pH-metric data. The binding sites in the complexes with a special regard to the possible role of COO − and NH 2 groups in the coordination have been discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
