title: Diaquaiodidotetrasarcosinepotassium: an overview of sarcosine metal halogenide structures.
abstract: The monoclinic crystal structure of tetrasarcosine potassium iodide dihydrate {or catena-poly[[potassium-tetra-μ-sarcosine-κ(4)O:O';κ(4)O:O] iodide dihydrate]}, {[K(C(3)H(7)NO(2))(4)]I·2H(2)O}(n) or Sar(4)·KI·2H(2)O (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.
authors.affiliation: Institut für Mineralogie und Kristallographie, Universität Wien-Geozentrum, Althanstrasse 14, A-1090 Wien, Austria. michel.fleck@univie.ac.at
authors.forename: Michel
authors.initials: M
authors.lastname: Fleck
authors.forename: Vahram V
authors.initials: VV
authors.lastname: Ghazaryan
authors.forename: Aram M
authors.initials: AM
authors.lastname: Petrosyan
mesh_terms: D019663:Chenopodiaceae / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D007454:Iodides / Q000737:chemistry*; D007477:Ions / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D015394:Molecular Structure; D011188:Potassium / Q000737:chemistry*; D012521:Sarcosine / Q000737:chemistry*
chemical_list: D007454:Iodides; D007477:Ions; D008670:Metals; D011188:Potassium; D012521:Sarcosine