Abstract
Three new alkaline earth metal molybdenum(VI) arsenates, Ba3(MoO3)3(H2O)(AsO4)2 (1), SrMoO3HAsO4·H2O (2), and Sr(MoO2AsO4)2 (3), have been prepared and structurally characterized by single-crystal X-ray diffraction and thermogravimetric analysis. Crystal data: 1, monoclinic, P21/c, a = 10.1814(2) A, b = 17.5553(1) A, c = 17.0799(1) A, β = 90.349(1)°, V = 3052.75(7) A3, and Z = 8; 2, monoclinic, C2/c, a = 15.1927(11) A, b = 10.2590(8) A, c = 9.6550(7) A, β = 121.877(1)°, V = 1277.9(3) A3, and Z = 8; 3, monoclinic, P21/c, a = 6.5904(3) A, b = 6.8592(3) A, c = 10.4472(5) A, β = 92.106(2)°, V = 471.94(6) A3, and Z = 2. Crystal 1 adopts a novel open-framework structure which is composed of isolated MoO6 and Mo(H2O)O5 octahedra linked by AsO4 tetrahedra, resulting in intersecting tunnels where Ba2+ cations reside. Crystal 2 has a layer structure in which MoO6 octahedra are corner-shared with HAsO4 tetrahedra forming infinite sheets parallel to the (100) planes. The Sr2+ cations and water molecules are between ...
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