Mercury(II) Complexes Containing the [Hg(L)2]2–, [Hg(L)(HL)]−, and [Hg(HL)2] Units [H2L = 3-(2-Chlorophenyl)-2-sulfanylpropenoic Acid]. Structural and Spectroscopic Effects of the Different Degrees of Ligand Protonation | Publicación