Before revision: Among pnictogen group Lewis acidic compounds, unusual lewis acidity of Lewis acidic antimony compounds have long been exploited as both i) stable conjugate acids of non-coordinating anions ( SbF6− and Sb2F11−) and ii) strong Lewis acid counterparts of well-known superacids (magic acids, fluoroantimonic acid).
After revision: Among pnictogen group Lewis acidic compounds, unusual lewis acidity of Lewis acidic antimony compounds have long been exploited as both i) stable conjugate acids of non-coordinating anions ( SbF6− and Sb2F11−) and ), and strong Lewis acid counterparts of well-known superacids (magic acids, fluoroantimonic acid).