E. Kemnitz et al., SYNTHESIS AND STRUCTURE OF ZN(HSO4)2(H2SO 4)(2) AND CD(HSO4)(2), Zeitschrift fur Naturforschung. B, A journal of chemical sciences, 51(1), 1996, pp. 14-18
From the binary systems M(2)SO(4)/H2SO4 (M = Zn, Cd), two new hydrogen
sulfates, (Zn(HSO4)(2)(H2SO4)(2) and Cd(HSO4)(2), have been synthesiz
ed and structurally characterized. Both compounds crystallize in the m
onoclinic space group P2(1)/c with cell parameters a = 5.047(2), b = 1
5.430(4), c = 7.958(3) Angstrom and beta = 104.16(4)degrees (Z = 2) fo
r Zn(HSO4)(2)(H2SO4)(2) and a = 5.339(1), b = 13.351(3), c = 8.508(2)
Angstrom and beta = 92.22(3)degrees (Z = 4) for Cd(HSO4)(2). In the zi
nc compound there are slightly distorted centrosymmetric ZnO6 octahedr
a with Zn-O distances of 2.05 - 2.13 Angstrom which are sharing corner
s with SO4 tetrahedra. HSO4 and H2SO4 tetrahedra are linked via hydrog
en bonds to form layers perpendicular to the c-axis. In the crystal st
ructure of Cd(HSO4)(2) there exist two crystallographically different
HSO tetrahedra. The CdO6 octahedra with Cd-O distances between 2.24 an
d 2.31 Angstrom are strongly angle-distorted. Besides hydrogen bonds o
f medium strength (d(O ... O) = 2.66 Angstrom) there are also much mor
e weaker ones (d(O ... O) = 3.04 Angstrom). Considering these latter o
nes zigzag chains in z-direction can be recognized. The relatively low
stability of Cd(HSO4)(2) in comparison wi th other metal-II-hydrogen
sulfates is discussed with respect to its structural pecularities.