Abstract
Abstract The crystal structure of Hg(OH)NO3 has been determined by x-ray diffraction method using 570 independent three-dimensional intensity data obtained by photographic technique. The crystals are monocliinc with a = 6.57 ± 0.01 Å, b = 7.19 ± 0.01 Å, c = 7.83 ± 0.01 Å, β = 115° 40′ ± 10′ and 4 formula units per unit cell. The space group is P21/c – C 2h 5. The refinement yielded an R value of 8.1% for observed reflections. The mercury and oxygen atoms (of OH groups) form infinite planar –Hg–O–Hg–O– zig-zag chains running parallel to the b axis. Within the chain the Hg–O distances are 2.031 ± 0.034 Å and 2.054 ± 0.033 Å and suggest a covalent bond. The angles Hg–O–Hg and O–Hg–O are 123.9 ± 1.3° and 171.5 ± 0.9° respectively. The zig-zag chains built a layer parallel (100). Between two layers is a layer of nitrate groups. The layers are linked together by weak Hg–O bonds of 2.659 Å.
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