Ammonium Aminodiboranate: A Long-Sought Isomer of Diammoniate of Diborane and Ammonia Borane Dimer

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• 作者：Weidong Chen ; Dr. Haibo Yu ; Dr. Guotao Wu ; Dr. Teng He ; Zhao Li ; Prof. Dr. Zaiping Guo ; Prof. Dr. Huakun Liu ; Dr. Zhenguo Huang and Prof. Dr. Ping Chen
• 刊名：Chemistry - A European Journal
• 出版年：2016
• 出版时间：June 1, 2016
• 年：2016
• 卷：22
• 期：23
• 页码：7727-7729
• 全文大小：702K
• ISSN：1521-3765

文摘

Ammonium aminodiboranate ([NH₄][BH₃NH₂BH₃]) is a long-sought isomer of diammoniate of diborane ([NH₃BH₂NH₃][BH₄]) and ammonia borane (NH₃BH₃) dimer. Our results show that [NH₄][BH₃NH₂BH₃] is stable in tetrahydrofuran at −18 °C and decomposes rapidly to NH₃BH₂NH₂BH₃ and H₂ at elevated temperatures. The decomposition pathway is dictated by the dihydrogen bonding between H^δ+ on NH₄⁺ and H^δ− on BH₃, as confirmed by theoretical calculations. This is in contrast to the interconversion between [NH₃BH₂NH₃][BH₄] and (NH₃BH₃)₂, although all three have dihydrogen bonds and the same stoichiometry.