Chen Weidong, Yu Haibo, Wu Guotao, He Teng, Li Zhao, Guo Zaiping, Liu Huakun, Huang Zhenguo, Chen Ping
National Laboratory for Clean Energy, Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, Liaoning, P. R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Chemistry. 2016 Jun 1;22(23):7727-9. doi: 10.1002/chem.201601375. Epub 2016 Apr 26.
Ammonium aminodiboranate ([NH4 ][BH3 NH2 BH3 ]) is a long-sought isomer of diammoniate of diborane ([NH3 BH2 NH3 ][BH4 ]) and ammonia borane (NH3 BH3 ) dimer. Our results show that [NH4 ][BH3 NH2 BH3 ] is stable in tetrahydrofuran at -18 °C and decomposes rapidly to NH3 BH2 NH2 BH3 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 [NH3 BH2 NH3 ][BH4 ] and (NH3 BH3 )2 , although all three have dihydrogen bonds and the same stoichiometry.
氨基二硼酸铵（[NH₄ ][BH₃ NH₂ BH₃ ]）是长期以来一直寻找的乙硼烷二氨合物（[NH₃ BH₂ NH₃ ][BH₄ ]）和氨硼烷（NH₃ BH₃ ）二聚体的异构体。我们的结果表明，[NH₄ ][BH₃ NH₂ BH₃ ]在-18°C的四氢呋喃中稳定，在升高的温度下会迅速分解为NH₃ BH₂ NH₂ BH₃ 和H₂ 。理论计算证实，分解途径由NH₄⁺ 上的H(δ⁺)与BH₃ 上的H(δ⁻)之间的双氢键决定。这与[NH₃ BH₂ NH₃ ][BH₄ ]和(NH₃ BH₃ )₂ 之间的相互转化形成对比，尽管这三者都有双氢键且化学计量比相同。
