Terms sourced from: http://iupac.org/publications/pac/62/1/0017/

"Free energies of cation-molecule complex formation and cation-solvent transfers", Taft, R.W.;Anvia, F.;Gal, J.;Walsh, S.;Capon, M.;Holmes, M.C.;Hosn, K.;Oloumi, G.;Vasanwala, R.;Yazdani, S., Pure And Applied Chemistry 1990, 62(1), 17