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From the binary systems M 2 SO 4 /H 2 SO 4  (M = Zn, Cd), two new hydrogen sulfates, (Zn(HSO 4 ) 2 (H 2 SO 4 ) 2  and Cd(HSO 4 ) 2 , have been synthesized and structurally characterized. Both compounds crystallize in the monoclinic space group P2 1 /c with cell parameters a = 5.047(2), b = 15.430(4), c = 7.958(3) Å and β = 104.16(4)° (Z= 2) for Zn(HSO 4 ) 2 (H 2 SO 4 ) 2  and a = 5.339(1), b = 13.351(3), c = 8.508(2) Å and β = 92.22(3)° (Z = 4) for Cd(HSO 4 ) 2 . In the zinc compound there are slightly distorted centrosymmetric ZnO 6  octahedra with Zn-O distances of 2.05-2.13 A which are sharing corners with SO 4  tetrahedra. HSO 4  and H 2 SO 4  tetrahedra are linked via hydrogen bonds to form layers perpendicular to the c-axis. In the crystal structure of Cd(HSO 4 ) 2  there exist two crystallographically different HSO 4  tetrahedra. The CdO 6  octahedra with Cd-O distances between 2.24 and 2.31 A are strongly angle-distorted. Besides hydrogen bonds of medium strength (d o···o  = 2.66 Å) there are also much more weaker ones (d o···o  = 3.04 Å). Considering these latter ones zigzag chains in z-direction can be recognized.

Synthese und Struktur von Zn(HSO 4 ) 2 (H 2 SO 4 ) 2 und Cd(HSO 4 ) 2 / Synthesis and Structure of Zn(HSO 4 ) 2 (H 2 SO 4 ) 2 und Cd(HSO 4 ) 2