Ionic dissociations of the halosulfonic acids HSO3X, X = F, Cl, Br in an aqueous environment are studied by density functional theory and ab initio method calculations of the water clusters HSO3X-(H2O)n, n = 1-4. With a minimum of n = 3, HSO3X is dissociated as a result of proton transfer from HSO3X to H2O. Two competing stable configurations are reported: one with the halogen pointing away from water and the other with the halogen participating in hydrogen bonding with water. In the former, the S-X bond is stable with the successive addition of water molecules while in the latter the bond length increases gradually. © 2006 Elsevier B.V. All rights reserved.
Li, S., Tao, F. M., & Gu, R. (2006). Theoretical study on the ionic dissociation of halosulfonic acids in small water clusters. Chemical Physics Letters, 426(1–3), 1–7. https://doi.org/10.1016/j.cplett.2006.04.117