Salts containing different amino acids: l-argininium ( +) sarcosine halogenides

Abstract

Recently we have discovered a new class of amino acids salts containing different amino acids. In the present paper we report crystal structures of three isostructural salts: l-argininium(+) sarcosine chloride (I), l-argininium(+) sarcosine bromide (II) and l-argininium(+) sarcosine iodide (III), formed by slow evaporation at room temperature from aqueous solutions containing stoichiometric ratios of components. The compounds crystallize in the polar space group P2 1 with two formula units in the asymmetric unit. The structures are stabilized due to N-H•••O and N-H•••X (X = Cl, Br, I) hydrogen bonds. Infrared spectra of all three crystals are shown and discussed.