- Crystal growth and refinement of the crystal structure of mercury(II) amide chloride - HgClNH2
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Single crystals were prepared by recrystallization of HgClNH2 from aqueous NH3/NH4+ solution at 160 °C. They were used for a single-crystal X-ray structure redetermination. The previously reported [W. N. Lipscomb, Acta. Crystallogr. 1951, 4, 266.] structural topology determined on basis of X-ray powder diffraction data is now confirmed. However, a higher symmetry is found: Space group type Pmma (instead of Pmrn2), a = 6.709(1) A?, b = 4.351(1) A?, c = 5.154(1) A?, Z = 2. The crystal structure contains zig-zag-chains 1∞[Hg(NH2)2/2]+. Four Cl atoms complete the coordination sphere of Hg to a distorted octahedron. These share common faces and edges in layers 2∞[HgCl4/4(NH2) 2/2]. These layers are connected via hydrogen bonds N-H ? Cl.
- Leineweber,Jacobs
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- Two mercuric ammoniates: [Hg(NH3)2][HgCl3]2 and [Hg(NH3)4](ClO4)2
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[Hg(NH3)2][HgCl3]2 (1) is obtained by saturating an equimolar solution of HgCl2 and NH4Cl with Hg(NH2)Cl at 75 °C. 1 crystallizes in the orthorhombic space group Pmna with a = 591.9(1) pm, b = 800.3(1) pm, c = 1243.3(4) pm, Z = 2. The structure consists of linear cations [Hg(NH3)2]2+ and T-shaped anions [HgCl3]-. The coordination sphere of mercury is effectively completed to compressed hexagonal bipyramids and distorted octahedra, respectively. Single crystals of [Hg(NH3)4](ClO4)2 (2) are obtained by passing gaseous ammonia through a solution of mercuric perchlorate, while the solution was cooled to temperatures below 10 °C. 2 crystallizes in the monoclinic space group P21/c with a = 791.52(9) pm, b = 1084.3(2) pm, c = 1566.4(2)pm, β = 120.352(1)°, Z = 4. The structure consists of compressed [Hg(NH3)4]2+ tetrahedra and perchlorate anions. The packing of the heavy atoms Hg and Cl is analogous to the baddeleyite (α-ZrO2) type of structure.
- Nockemann, Peter,Meyer, Gerd
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