祝贺陈西孟同学与麻娜娜老师共同一作的论文在Angew. Chem. Int. Ed.上发表
更新时间：2019-01-21
文章题目：Facile Synthesis of Unsolvated Alkali Metal Octahydrotriborate Salts MB3H8 (M=K, Rb, and Cs), Mechanisms of Formation, and the Crystal Structure of KB3H8
作者：Xi-Meng Chen+, Nana Ma+, Xin-Ran Liu, Changgeng Wei, Chong-Chao Cui, Bu-La Cao, Yanhui Guo,* Lai-Sheng Wang,* Qinfen Gu, and Xuenian Chen*
A facile synthesis of heavy alkali metal octahydrotriborates (MB3H8; M=K, Rb, and Cs) has been developed. It is simply based on reactions of the pure alkali metals with THF·BH3, does not require the use of electron carriers or the addition of other reaction media such as mercury, silica gel, or inert salts as for previous procedures, and delivers the desired products at room temperature in very high yields. However, no reactions were observed when pure Li or Na was used. The reaction mechanisms for the heavy alkali metals were investigated both experimentally and computationally. The low sublimation energies of K, Rb, and Cs were found to be key for initiation of the reactions. The syntheses can be carried out at room temperature because all of the elementary reaction steps have low energy barriers, whereas reactions of LiBH4/NaBH4 with THF·BH3 have to be carried out under reflux. The high stability and solubility of KB3H8 were examined, and a crystal structure thereof was obtained for the first time.
Angew. Chem. Int. Ed. 2019, 58, 2720 –2724 https://onlinelibrary.wiley.com/doi/10.1002/anie.201812795
作者：Xi-Meng Chen+, Nana Ma+, Xin-Ran Liu, Changgeng Wei, Chong-Chao Cui, Bu-La Cao, Yanhui Guo,* Lai-Sheng Wang,* Qinfen Gu, and Xuenian Chen*
A facile synthesis of heavy alkali metal octahydrotriborates (MB3H8; M=K, Rb, and Cs) has been developed. It is simply based on reactions of the pure alkali metals with THF·BH3, does not require the use of electron carriers or the addition of other reaction media such as mercury, silica gel, or inert salts as for previous procedures, and delivers the desired products at room temperature in very high yields. However, no reactions were observed when pure Li or Na was used. The reaction mechanisms for the heavy alkali metals were investigated both experimentally and computationally. The low sublimation energies of K, Rb, and Cs were found to be key for initiation of the reactions. The syntheses can be carried out at room temperature because all of the elementary reaction steps have low energy barriers, whereas reactions of LiBH4/NaBH4 with THF·BH3 have to be carried out under reflux. The high stability and solubility of KB3H8 were examined, and a crystal structure thereof was obtained for the first time.
Angew. Chem. Int. Ed. 2019, 58, 2720 –2724 https://onlinelibrary.wiley.com/doi/10.1002/anie.201812795