Abstract
The product of mercuration of acetaldehyde in aqueous mercuric-nitrate is a hydrated oxonium nitrate of tris(mercuri) acetaldehyde, [OHg 3CCHO]NO 3·H 2O, the crystal structure of which has been determined. The crystals are tetragonal, space group P4 2/ m with four formula units in the unit cell of dimensions a 10.755(3) and c 6.763(2) Å. The structure was determined by means of X-ray diffractometry and refined by full-matrix least-squares method to an R value of 0.038. Mercuration of acetylene gives the same product but in polycrystalline form as shown by X-ray powder diagrams. The Hg 3CCHO units are interconnected by oxonium oxygen atoms to a polymeric columnar [OHg 3CCHO] n n+ cation. The nitrate ions show positional disorder. The geometry of the column is defined by a flat Hg 3O oxonium pyramid and a slightly distorted Hg 3CC tetrahedron, with HgO and HgC bond distances of 2.04(1) to 2.08(1) Å.
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