Hydrogenium-bis-hydrogensulfate anions adjacent to S2O7(2-) in Rb-3S2O7H(HSO4)(2):a structural evidence of the increasing acidity of polysulfuric acids with growing chain length

摘要

Rb-3H(HSO4)(2)S2O7 (monoclinic, C2/c (no. 15), a = 1638.75(6), b = 768.52(3), c = 1187.88(4) pm, beta = 106.805(2)degrees, V = 1432.14(9) center dot 10(6) pm, Z = 4) was obtained from the reaction of Rb-2CO3 (99.9, not dried, 150 mg, 0.6 mmol) with neat SO3 in a torch-sealed glass ampoule. The remaining quantity of water in the starting material was obviously sufficient to lead to an H-containing substance. The structure shows the unprotonated disulfate anion S2O7(2-) adjacent to the hydrogenium- bis- hydrogensulfate anion H(HSO4)(2)(-) with the central hydrogen atom located close to a center of inversion.