Molekül‐ und Kristallstruktur von Quecksilber(II)‐α‐Amino‐γ‐methylmercapto‐butyrat, Hg(Met)2

Abstract

AbstractMolecular and Crystal Structure of Mercuric α‐Amino‐γ‐methyl‐mercapto‐butyrate, Hg(Met)2The mercuric salt of deprotonated methionine, Hg(Met)2, was obtained as colourless needles from aqueous solutions of methionine and HgCl2 or HgO, respectively. The crystal structure (monoclinic, P21, Z = 2, a = 984, 2(2), 507, 96(6), c = 1574, 2(3) pm, β = 93, 05(2)°; Rall = 0, 055) exhibits formula‐like molecules with strong Hg—N coordination at a distance of 216 pm; one oxygen atom adds to a chelate like N—Hg—O coordination. Stacking of these molecules adds two oxygen atoms of different methionate anions to an effective 2+2+2 „octahedral”︁ coordination around the mercuric ion. Thereby a layer structure parallel (001) is formed with the methyl‐mercapto function on top and bottom of these layers.