Preparation,Single Crystal Structure Analysis,and Thermal Behaviour of the Acidic Mercury(I) Phosphate (Hg2)2(H2PO4)(PO4) |
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Authors: | Matthias Weil |
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Abstract: | Yellowish single crystals of acidic mercury(I) phosphate (Hg2)2(H2PO4)(PO4) were obtained at 200 °C under hydrothermal conditions in 32% HF from a starting complex of microcrystalline (Hg2)2P2O7. Refinement of single crystal data converged at a conventional residual RF2 > 2σ(F2)] = 3.8% (C2/c, Z = 8, a = 9.597(2) Å, b = 12.673(2) Å, c = 7.976(1) Å, β = 110.91(1)°, V = 906.2(2) Å3, 1426 independent reflections > 2σ out of 4147 reflections, 66 variables). The crystal structure consists of Hg22+‐dumbbells and discrete phosphate groups H2PO4– and PO43–. The Hg22+ pairs are built of two crystallographically independent Hg atoms with a distance d(Hg1–Hg2) = 2.5240(6) Å. The oxygen coordination sphere around the mercury atoms is asymmetric with three O atoms for Hg1 and four O atoms for Hg2. The oxygen atoms belong to the different PO4 tetrahedra, which in case of H2PO4‐groups are connected by hydrogen bonding. Upon heating over 230 °C, (Hg2)2(H2PO4)(PO4) condenses to (Hg2)2P2O7, which in turn disproportionates at higher temperatures into Hg2P2O7 and elemental mercury. |
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Keywords: | Mercury Phosphates Crystal structure |
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