Table 1.

Formation Constants (logK _f) for Hg²⁺‐ligand 1:1 Complexes, from Ref.28 and Ref.29

S‐Ligand	Log K f	N‐Ligand	Log K f
S2‐	52.7	NH3	8.8
Mercaptosuccinic acid	16.3	CH3NH2	8.66
Mercaptoacetic acid	15.9	Pyridine	5.1
β‐mercaptoethanol	15.1	Imidazole	3.57
Cysteine	14.4	Histidine	7.28
		Histidine‐Me‐ester	5.33