Halogenides of dimethylglycine in comparison with respective salts of glycine, sarcosine and betaine

Abstract We investigated salts formation in the DMG(dimethylglycine) HCl H 2 O, DMG HBr H 2 O and DMG HI H 2 O systems. In addition to previously known dimethylglycinium chloride (DMGH)Cl, we obtained and characterized (structurally and spectroscopically) the following crystals: (DMGH)Br, (DMGH)I as well as the first salts of DMG with dimeric (DMG⋯DMGH) cation: (DMG⋯DMGH)Cl, (DMG⋯DMGH)Br, (DMG⋯DMGH)I. Obtained results are compared with results of known or newly obtained respective salts of glycine, sarcosine (monomethylglycine) and betaine (trimethylglycine).