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Crystal Structure of the First Polymeric Tetramercurated Methane Derivative of Hofmann's Base

By dissolving Hofmann's base, [CHg4O(OH2)](OH)2 – a polymeric organomercury compound, in trifluoromethanesulfonic acid, crystals of [CHg4OH(OH2)2](CF3 SO3)3 2H2O were obtained and characterized by X-ray diffraction. It is the first polymeric tetramercurated methane derivative of Hofmann's base. The asymmetric unit of the monoclinic P21/n space group consists of a monomeric unit of the polymeric cation [CHg4OH(OH2)2]n3n+ three trifluoromethanesulfonate anions and two crystallization water molecules. In the polymeric chains two neighbouring tetramercurated methane moieties are interconnected through an OH group – a dimercurated oxonium ion, – Hg– (OH)+– Hg– . H2O molecules are bound to two mercury atoms that do not take part in the bridging and represent monomercurated oxonium ions Hg(OH)2+ The polymeric chains are arranged in parallel puckered layers and are interlinked by an extensive three-dimensional hydrogen-bonding network. The characteristic coordination of mercury atoms is linear, while the effective coordination is 2+3.

organomercury; tetramercurated methane; Hofmann’ s base; X-ray crystal structure

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