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

We investigated salts formation in the DMG(dimethylglycine)-HCl-H2O, DMG-HBr-H2O and DMG-HI-H2O 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 center dot center dot center dot DMGH) cation: (DMG center dot center dot center dot DMGH)Cl, (DMG center dot center dot center dot DMGH)Br, (DMG center dot center dot center dot DMGH)I. Obtained results are compared with results of known or newly obtained respective salts of glycine, sarcosine (monomethylglycine) and betaine (trimethylglycine). (C) 2018 Elsevier B.V. All rights reserved.