“From the reaction of HMBA with manganese(II) bromide two crystalline forms were obtained, [Mn(HMBA)(3)](MnBr(4)).2EtOH, with a structure similar to [Co(HMBA)(3)](CoCl(4)).2EtOH, and a solvent-free form, [Mn(HMBA)(3)](MnBr(4)), comprising a cationic sheet array.”