1,1′-(Propane-1,3-diyl)dipyridinium dibromidodiiodidomercurate(II)

Abstract

Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.012 Å; disorder in main residue; R factor = 0.039; wR factor = 0.100; data-to-parameter ratio = 20.1. CommentThe preceding study reports the structure of a tetrahedral dibromidodichloridomercurate(II), which has been isolated as the 1,2-ethanedipyridinium salt (Wang et al., 2007). Replacing the cation by 1,3-propanedipyridinium furnishes a similar tetrahalomercurate. The anion of the salt is composed 2.25 bromines and 1.75 iodines; the metal atom shows tetrahedral coordination (Fig. 1). Selected bond distances are given in Table 1. ExperimentalThe salt was synthesized from the reaction of propane-1,3-dipyridinium dibromide (0.036 g, 0.1 mmol) in methanol (5 ml) and mercuric iodide (0.091 g, 0.2 mmol) in DMF (10 ml). The mixture was set aside for the formation of colorless crystals in 30% yield after several days.