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Protonation versus Oxonium Salt Formation: Basicity and Stability Tuning of Cyanoborate Anions
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2017-01-27 , DOI: 10.1002/anie.201611901
Christoph Kerpen 1 , Jan A. P. Sprenger 1 , Lorena Herkert 1 , Marius Schäfer 1 , Lisa A. Bischoff 1 , Pierre Zeides 1 , Matthias Grüne 2 , Rüdiger Bertermann 1 , Franziska A. Brede 1 , Klaus Müller-Buschbaum 1 , Nikolai V. Ignat'ev 3 , Maik Finze 1
Affiliation  

Anhydrous H[BH2(CN)2] crystallizes from acidic aqueous solutions of the dicyanodihydridoborate anion. The formation of H[BH2(CN)2] is surprising as the protonation of nitriles requires strongly acidic and anhydrous conditions but it can be rationalized based on theoretical data. In contrast, [BX(CN)3] (X=H, F) gives the expected oxonium salts (H3O)[BX(CN)3] while (H3O)[BF2(CN)2]/H[BF2(CN)2] is unstable. H[BH2(CN)2] forms chains via N−H⋅⋅⋅N bonds in the solid state and melts at 54 °C. Solutions of H[BH2(CN)2] in the room‐temperature ionic liquid [EMIm][BH2(CN)2] contain the [(NC)H2BCN−H⋅⋅⋅NCBH2(CN)] anion and are unusually stable, which enabled the study of selected spectroscopic and physical properties. [(NC)H2BCN−H⋅⋅⋅NCBH2(CN)] slowly gives H2 and [(NC)H2BCN−BH(CN)2]. The latter compound is a source of the free Lewis acid BH(CN)2, as shown by the generation of [BHF(CN)2] and BH(CN)2⋅py.

中文翻译:

质子化与氧鎓盐的形成:氰基硼酸根阴离子的碱性和稳定性调节

无水H [BH 2(CN)2 ]从氰基氢硼酸根阴离子的酸性水溶液中结晶。H [BH 2(CN)2 ]的形成令人惊讶,因为腈的质子化需要强酸性和无水条件,但可以根据理论数据对其进行合理化。相反,[BX(CN)3 ] -(X = H,F)给出了预期的氧鎓盐(H 3 O)[BX(CN)3 ],而(H 3 O)[BF 2(CN)2 ] / H [BF 2(CN)2 ]不稳定。H [BH 2(CN)2通过固态的N-H⋅⋅⋅N键形成链,并在54°C时熔化。的H [BH溶液2(CN)2 ]在室温离子液体[EMIM] [BH 2(CN)2 ]包括[(NC)H 2 BCN-H⋅⋅⋅NCBH 2(CN)] -阴离子和异常稳定,这使得能够研究选定的光谱和物理性质。[(NC)H 2 BCN-H⋅⋅⋅NCBH 2(CN)] -慢慢给出ħ 2和[(NC)H 2 BCN-BH(CN)2 ] -。后者是游离路易斯酸BH(CN)2的来源,如图[(CN)BHF产生的2 ] -和BH(CN)2 ⋅py。
更新日期:2017-01-27
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