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Mercury(II) iodate(V) is dimorphous and crystallizes in two polymorphs named α- and β - Hg(IO 3 ) 2 . The α-modification was prepared by precipitation of a slightly acidified Hg(NO 3 ) 2  solution with an excess of an aqueous HIO 3  solution; for the polycrystalline material unindexed powder data is given. Colourless to light-yellow single crystals of the β -modification, with an edge-length of up to 0.3 mm and a plate-like habit, were grown during hydrothermal treatment (220 °C, 10 d) of the polycrystalline precipitate. The crystal structure of β -Hg(IO 3 ) 2  was determined from single crystal X-ray data (space group P2 1  (no. 4), Z =2, a=5.7818(9), b=5.6077(10), c=8.9849(12) Å, β =102.890(2)°, 1668 structure factors, 83 parameter, R[F 2  &gt;2σ (F 2 )]=0.0175, wR(F 2  all) = 0.0382) and is made up from trigonal pyramidal IO 3  groups with an average I-O distance of 1.825 Å and distorted [HgO 8 ] polyhedra with a mean Hg-O bond length of 2.537 Å as the main building units. Infinite zig-zag chains of cis-corner-sharing [HgO 4/2 O 4/1 ] polyhedra extend parallel to [010]. The chains are connected by IO 3  groups along the [100] direction to form layers parallel to the (001) plane. The three-dimensional framework is held together by weak intermolecular I-O interactions &gt; 2.58 Å along the [001] direction. No α ↔ β phase transformation was detected upon heating. Both polymorphs decompose completely in an one-step mechanism around 500°C.

zeitschrift für naturforschung b

Dimorphism in Mercury(II) Iodate(V): Preparation and Thermal Behaviour of α- and β-Hg(IO 3 ) 2 , and Single Crystal Structure Analysis of β-Hg(IO 3 ) 2