A New Acid Selenite: Mg(HSeO₃)₂

Magnesium bis[hydrogentrioxoselenate(IV)] crystallizes in a new structure type with Mg²⁺ and hydrogen-bonded dimers of trigonal pyramidal SeO₂OH⁻ ions in an NaCl-like arrangement forming MgO₆ octahedra linked via O—Se—O bonds to a three-dimensional network structure. The Mg—O and Se—O distances reflect the bonding schemes of the corresponding atoms. The hydrogen bonds in the (SeO₂OH⁻)₂ dimers are strong, with d(OH...O) = 2.616 (2) Å. They are joined through Se and Mg atoms to form layered hydrogen-bond systems parallel to (100).

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