Abstract
The unit cell of the title compound, [Mg(H2O)6]2(C8N2O8)·4H2O, contains two hexaquamagnesium(II) cations, one fully deprotonated pyrazine-2,3,5,6-tetracarboxylate [(2,3,5,6-PZTC)4−] anion with its geometrical centre situated at the inversion centre and four solvent water molecules. The magnesium(II) ion is surrounded by six water molecules with their O atoms located at the apices of a fairly regular octahedron. Mg—O bond distances range from 2.036 (1) to 2.113 (1) A (mean value 2.065 A). The carboxylate groups are inclined to the pyrazine ring by 22.8 (1)and 99.1 (1)°. A three-dimensional network of hydrogen bonds is built up between the coordinated water molecules and the carboxylate O atoms.
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