Structure of calcium dizinc hexabromide hexahydrate Ca(H2O)6Zn2Br6 Journal Articles uri icon

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abstract

  • Abstract [Ca(H2O)6] [Zn2Br6], Mr = 758.36, monoclinic, C2/m, a = 13.276(6), b = 10.665(3), c = 13.785(7) Å, β = 113.30(3)°, V = 1792.2(12) Å3, Z = 4, Dx = 2.81 Mg m−3, MoKα radiation, λ = 0.71069 Å, μ = 15.99 mm−1, F(000) = 1400, room temperature, R = 0.055 (wR = 0.053) for 640 unique observed [I > 3σ(I)] reflections. The structure consists of independent octahedral Ca(H2O)6 2+ complexes (〈Ca–O〉 = 2.32 Å) and dimeric tetrahedral Zn2Br6 2− complexes [〈Zn–Br〉 = 2.48 (bridging) and 2.35 Å (terminal)] linked together by O–H…Br hydrogen bonds. The structure is related to those of MgZn2Br6 · 6H2O and ZnBr2 · 2H2O but the packing of the complex ions (and, hence, the hydrogen bonding) is different.

publication date

  • February 1, 1993