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Abstract
Three new compounds 2[OHg 3CCHO]NO 3 · HNO 3 ( A), [HOHg 2(NO 3Hg)CCHO]NO 3 ( B) and (NO 3Hg) 3CCHO ( C), have been successively obtained by mercuration of acetaldehyde with mercuric nitrate containing increasing concentrations of nitric acid. All of them contain trimercurated acetaldehyde. The orthorhombic crystals of A built up of parallel infinite networks of the polymeric trimercurated oxonium [OHg 3CCHO] n n+ cation, while the monoclinic crystals of B contain polymeric dimercurated oxonium [HoHg 2(NO 3Hg)CCHO] n n+1 cation in the form of an infinite helical chain. The structures were determined by X-ray diffraction and refined by full-matrix least-squares to the R value of 0.050 for A and 0.063 for B. The Hg-C and Hg-O distances are in the ranges 2.04 to 2.11 Å and 2.11 to 2.18 Å, respectively. The crystals of C were not suitable for X-ray structure analysis.
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