The Strongest Isolable Acid


  • This work was supported by NSF grant CHE-0095206 and NIH grant GM 23851.


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Measure for measure: Several measures indicate that carborane acids of the type H(CHB11R5X6) (see scheme, green R, red X, gray H, pink B) for R=H, Cl and X=Cl, Br, I are the strongest pure Brønsted acids. Based on NMR and IR spectroscopy, H(CHB11Cl11) can lay claim to be the strongest isolable acid presently known.