The molecular structure of compound 2 indicates a MgCl + mono cation core which is coordinated by one DG molecule and two THF molecules, and tetraphenyl aluminate counter anions (figure ). Monomeric MgCl + cation is an unusual species for magnesium electrolytes and earlier, such type of species were isolated as dimeric species [(Mg2Cl2)(2DME)] 2+ . We very recently isolated the monomeric cation in a framework of the salt (MgCl . 5THF) + (PhAlCl3) -in which the MgCl + cation is coordinated by five THF molecules. In the new compounds 1 and 2, the MgCl + cation has a mixed solvation shell, coordinated to both THF and DME/DG molecules. To the best of our knowledge, this is the first time that Mg based cations with mixed solvation shell of this sort has been synthesized.