Whereas isolated SO42- is unstable, hydrated clusters of this dianion have been formed and investigated using a variety of different methods. Several structures of [SO4(H2O)(6)](2-) have been proposed that account for its high stability in the gas phase. Zhou et al. [J. Chem. Phys. 2006, 125, 111102] recently reported infrared spectra of [SO4(H2O)(n)](2-) in the 540-1850 cm(-1) region and assigned the spectrum of the hexahydrated ion to a T-d symmetry structure in which all six water molecules donate two hydrogen bonds to the sulfate core. Here, an infrared spectrum of this ion in the hydrogen stretch region (2620-3840 cm(-1)) and B3LYP/AUG-cc-pVDZ calculations indicate that a significant population of these ions correspond to lower symmetry structures containing water rings in which each water molecule donates hydrogen bonds to both the sulfate dianion and a neighboring water molecule. These calculations indicate that inter-water hydrogen bonds are slightly favored over additional solvation of the dianion core. These results demonstrate that the low- and high-frequency infrared spectra of this ion provide complementary information, and the combination can greatly enhance structural elucidation of these hydrated ions.