Diaquaiodidotetrasarcosinepotassium: an overview of sarcosine metal halogenide structures

Abstract

The monoclinic crystal structure of tetrasarcosine potassium iodide dihydrate {orcatena-poly[[potassium-tetra-μ-sarcosine-κ4O:O′;κ4O:O] iodide dihydrate]}, {[K(C3H7NO2)4]I·2H2O}nor Sar4·KI·2H2O (space groupC2/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]viasarcosine 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.