Synthesis and crystal structure of metal(I) hydrogen sulfates - Ag(H3O)(HSO4)(2) Ag-2(HSO4)(2)(H2SO4), AgHSO4, and Hg-2(HSO4)(2)

Hydrogen sulfates Ag(H3O)(HSO4)(2), Ag-2(HSO4)(2) . (H2SO4), and AgHSO4 hav e been synthesized from Ag2SO4 and sulfuric acid. Hg-2(HSO4)(2) was obtaine d from metallic mercury and 96% sulfuric acid as starting materials. The co mpounds were characterized by X-ray single crystal structure determination. Ag(H3O)(HSO4)(2) belongs to the structure type of Na(H3O)(HSO4). The silve r atom is coordinated by 6 + 2 oxygen atoms. In the structure, there are di mers and chains of hydrogen bonded HSO4- tetrahedra. Dimers and chains are connected by the H3O+ ion to form a three dimensional hydrogen network. Ag- 2(HSO4)(2)(H2SO4) crystallizes isotypic to Na-2(HSO4)(2)(H2SO4). The coordi nation number of silver is 6 + 1. The structure of Ag-2(HSO4)(2)(H2SO4) is characterized by hydrogen bonded trimers of HSO4- tetrahedra, which are fur ther connected to chains. For the recently published structure of AgHSO4 th e hydrogen bonding system was discussed. There are tetrameres and chains, c onnected by bifurcated hydrogen bonds. The structure of Hg-2(HSO4)(2) conta ins Hg-2(2+) cations with Hg-Hg distance of 2.509 Angstrom. Every mercury a tom is coordinated by one oxygen atom at shorter distance (2.18 Angstrom) a nd three ones at longer distances (2.57 to 3.08 Angstrom). The HSO4- tetrah edra form zigzag chains by hydrogen bonds.