Synthese und Kristallstruktur von Ba(HSO₄)₂(H₂SO₄)₃ und Sr(HSO₄)₂(H₂SO₄) / Synthesis and Structure of Ba (HSO₄)₂(H₂SO₄)₃ and Sr(HSO₄)₂(H₂SO₄)

Abstract

From the binary systems M 2 SO 4 /H 2 SO 4 (M = Ba. Sr), two new hydrogen sulfates, (Ba(HSO 4 ) 2 (H 2 SO 4 ) 3 and Sr(HSO 4 ) 2 (H 2 SO 4 ), have been synthesized and structurally characterized. Ba(HSO 4 ) 2 (H 2 SO 4 ) 3 crystallizes in the orthorhombic space group P2 1 2 1 2, with unit cell parameters a = 4.680(1), b = 11.267(2), c = 29.188(6)A, Z = 4. BaO 9 trigonal prismatic polyhedra with Ba-O distances of 2.68 - 3.02 Å from nine different SO 4 tetrahedra are connected via common bases and build “isolated” columns consisting of O-S-O bridged double chains along the x-axis. HSO 4 and H 2 SO 4 tetrahedra are linked via hydrogen bonds to form columns. Sr(HSO 4 ) 2 (HTSO 4 ) crystallizes in the triclinic space group P1̄ with unit cell parameters a = 5.971(1), b = 8.468(2), c = 10.226(2)Å, α = 81.71(3), β = 83.30(3), γ = 70.69(3)°, Z = 2. Sr is coordinated by nine oxygen atoms from seven different SO 4 tetrahedra with Sr-O distances of 2.47 - 2.84 Å. The SrO 9 polyhedra build layers consisting of O-S-O bridged chains. Three crystallographically different SO 4 tetrahedra are linked via hydrogen bonds to form a kind of flattened cylinder along the x-axis.