Avelar Amy, Tham Fook S, Reed Christopher A
Center for S and P Block Chemistry, Department of Chemistry, University of California, Riverside, CA 92521-0403, USA.
Angew Chem Int Ed Engl. 2009;48(19):3491-3. doi: 10.1002/anie.200900214.
Acid remarks: The anhydrous diprotic boron acids H(2)(B(12)X(12)) (X = Cl, Br; see picture, B orange, X green) are the first examples of diprotic superacids and may be the strongest acids yet isolated. Both protons protonate benzene to give benzenium ion salts that are stable at room temperature. These acids owe their existence to the stability of the icosahedral B(12) cluster with its dinegative charge buried beneath a layer of halide substituents.
无水二元硼氢酸H₂(B₁₂X₁₂)（X = Cl、Br；见图，B为橙色，X为绿色）是二元超强酸的首个实例，可能是迄今分离出的最强酸。两个质子均使苯质子化，生成在室温下稳定的苯鎓离子盐。这些酸的存在归因于二十面体B₁₂簇的稳定性，其双负电荷埋藏在一层卤化物取代基之下。
