CONNECTING CLUSTER IONS AND BULK AQUEOUS SOLVATION - A NEW DETERMINATION OF BULK SINGLE-ION SOLVATION ENTHALPIES

A new least-squares method based on cluster ion data and well-known bu lk constraints has been used to determine the single-ion bulk solvatio n enthalpies of a set of monovalent ions. A value of -1153(6) kJ/mol h as been determined for the standard solvation enthalpy of the proton. A value of 683(9) kJ/mol at 298 K has also been determined for the pro ton affinity of water. A simple framework has been presented for estim ating the solvation enthalpy of any size cluster ion which provides fu rther evidence for the view that large halide ions are not solvated in ternally by small water clusters.