  Attempts of synthesis of ionic (NH4)(BH3NH2BH2NH2BH3) using metathetical
approach resulted in a mixture of the target compound and a partly
dehydrogenated molecular NH3BH2NH2BH2NH2BH3 product. The mixed specimen was
characterized by NMR and vibrational spectroscopies, and the crystal structure
of their cocrystal was solved from powder x-ray diffraction data, and
supplemented by theoretical density functional theory calculations. Despite
their impressive hydrogen content, and similarly to ammonia borane, both title
compounds release hydrogen substantially polluted with borazine, and traces of
ammonia and diborane.
