The assignment of 11B and 1H resonances in the post‐reaction mixture from the dry synthesis of Li(BH3NH2BH2NH2BH3)

We report a detailed 1H NMR and 11B NMR study of as synthesised Li(BH3NH2BH2NH2BH3) obtained in a novel dry‐synthesis method. A combination of 1D and 2D single‐ and triple‐quantum techniques was used for the assignment of all observed signals. Minor side‐products and reactants were detected in the product: NH3BH3, Li(NH2BH3), Li(BH4), and two yet unknown salts containing 7‐membered chain anions: (BH3NH2BH2NH2BH2NH2BH3)− and (BH(NH2BH3)3)−. We believe the assignment provided within this study might be helpful when analysing the mixtures containing numerous ammonia borane derivatives, which often give overlapping signals that are hard to distinguish. We report a detailed 1H and 11B NMR study of Li(BH3NH2BH2NH2BH3) obtained in a novel dry‐synthesis method. The resonances of minor side‐products and reactants have also been assigned.