Abstract
The novel organic–inorganic hybrid salt [(C5H5N)2CH2][Hg2Cl6] was synthesized, isolated as pure white powder and fully characterized by FTIR, multinuclear NMR, UV–Vis spectroscopy and powder-X-ray diffraction studies. The molecular structure displays organic dicaions [(C5H5N)2CH2]2+ and distinctive dimeric anions [Hg2Cl6]2−. Within any indivisual [Hg2Cl6]2− unit, each Hg center is souronded by four Cl atoms (two terminal and two bridging Cl ones) adopting a distorted tetrahedral geometry. The terminal Cl atoms are covalently bonded to Hg with an average bond disntance of 2.32(5) Å and Cl–Hg–Cl angle of 138.14(5)°. In contrast the two bridging Cl ligands to Hg centers have relatively longer mean bond length of 2.51(5) Å and smaller Cl–Hg–Cl bond angle of 93.68(5)°. The edge Cl–Cl are shared by the two roughly tetrahedra to form the dimeric [Hg2Cl6]2−. The relatively large mean Cl–Hg–Cl angle of the terminal Cl atoms (138.14°) and small angle of the bridging ligands (93.68°) indicate a considerable deviation from the ideal tetrahedral geometry. Noteworthy, within each [Hg2Cl6]2− unit, the Hg1…Hg2 distance [3.41(3) Å] is slightly shorter than the sum of the van der Waals radii for Hg(II) indicating a rather weak mercurophilic interaction.
Graphical Abstract
The novel organic-inorganic hybrid salt [(C5H5N)2CH2][Hg2Cl6] was synthesized, isolated as pure white powder and fully characterized by FTIR, multinuclear NMR, UV-vis spectroscopy and powder-X-ray diffraction studies.
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The authors would thank Professor I. Othman, Director General, Professor A. H. Al-Rayyes, Head of the Radioisotope department, for their support of this work.
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Atomic Energy Commission of Syria
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Al-Ktaifani, M.M., Sabra, M.K., Alsharif, A.A. et al. Synthesis, Crystal and Molecular Structure of 1,1ʹ-Methylenedipyridinium [Hexachlorodimercurate(II)]. J Chem Crystallogr 52, 297–303 (2022). https://doi.org/10.1007/s10870-021-00915-z
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DOI: https://doi.org/10.1007/s10870-021-00915-z