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Covalent Interactions in Mercury Oxohalides and Their Role in Crystal Structure Fragmentation

Authors:	S V Borisov S A Magarill N V Pervukhina

Institution:	(1) A. V. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Russia

Abstract:	An Hg₆O₂]-cationic (r) octahedron atomic group has been isolated in a number of mercury oxohalide structures. The octahedron is constructed from two edge-sharing oxo-centered Hg₄O] tetrahedra. For -Hg₃O₂Cl₂, -Hg₃O₂Cl₂, Hg₂OI, Hg₂]₃O₂Cl₂, Hg₂]₃HgO₃Cl₂, Hg₅O₄Cl₂, and some other compounds, the geometrical parameters of their crystal structures depend on the dimensions and mutual packing of the cationic r-octahedra and the individual Hg₄O] tetrahedra, if any.

Keywords:	structures of mercury oxohalides crystal structure fragmentation [Hg₆O₂]— r-octahedron group
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