| Abstract: | The monoclinic crystal structure of tetrasarcosine potassium iodide dihydrate {or catena‐polypotassium‐tetra‐μ‐sarcosine‐κ4O:O′;κ4O:O] iodide dihydrate]}, {K(C3H7NO2)4]I·2H2O}n or Sar4·KI·2H2O (space group C2/c), comprises two crystallographically different sarcosine molecules and one water molecule on general positions, and one K+ cation and one I− anion located on twofold axes. The irregular eight‐coordinated K+ polyhedra are connected into infinite chains along 001] via sarcosine molecules. This compound is the first sarcosine metal halogenide salt with a 4:1 ratio. A short overview of other sarcosine metal halogenide salts is presented and relationships to similar glycine salts are discussed. |
