Die Tetracyanoborsäuren H[B(CN)4]·n H2O, n = 0, 1, 2 (The Tetracyanoboronic 
Acids H[B(CN)4]·n H2O, n = 0, 1, 2)

Küppers, Torsten; Bernhardt, Eduard; Lehmann, Christian W.; Willner, Helge

doi:10.1002/zaac.200700097

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Die Tetracyanoborsäuren H[B(CN)₄]·n H₂O, n = 0, 1, 2 (The Tetracyanoboronic Acids H[B(CN)₄]·n H₂O, n = 0, 1, 2)

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Lehmann, Christian W.
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Küppers, T., Bernhardt, E., Lehmann, C. W., & Willner, H. (2007). Die Tetracyanoborsäuren H[B(CN)₄]·n H₂O, n = 0, 1, 2 (The Tetracyanoboronic Acids H[B(CN)₄]·n H₂O, n = 0, 1, 2). Zeitschrift für anorganische und allgemeine Chemie, 633(10), 1666-1672. doi:10.1002/zaac.200700097.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-9233-3

Abstract

Treatment of an aqueous solution of Na[B(CN)₄] with an acidic cation exchange resin leads to a solution of the strong tetracyanoboronic acid. Evaporation of the solution at room temperature yields colourless single crystals of [H₅O₂][B(CN)₄] (P ͞4n2, a=9.5830(2)Å, c=14.25440(3)Å, Z=1). Further drying of [H₅O₂][B(CN)₄] (mp. 115 °C) in vacuum at 50 °C gives polycrystalline [H₃O][B(CN)₄] (P6₃mc, a=8.704(1)Å, c=6.152(1)Å, Z=2), which is thermally stable up to 145 °C. The anhydrous polycrystalline acid H[B(CN)₄] is formed quantitatively by reacting Me₃SiNCB(CN)₃ with gaseous HCl. This acid starts to decompose at 190 °C with loss of HCN. All three acids were further characterized by vibrational spectroscopy, and elemental analysis.