Kristallstrukturen von NaMg2OH(SO3)2 · H2O, NaMn2OH(SO3)2 · H2O , NaFe2OH(SO3)2 · H2O, NaCo2OH (SO3)2 H2O und NaZn2OH(SO3)2H2O/ Crystal Structures of NaMg2OH(SO3)2-H2O, NaMn2OH(SO3)2 · H2O,NaFe2OH(SO3)2H2O, NaCo2OH(SO3)2 · H2O, and NaZn2OH(SO3)2 · H2O

Abstract

Abstract The crystal structures of the isotypic hydroxosulfitometalates NaM2OH(SO3)2 ·1H2O with M = Mg, Mn, Fe, Co, and Zn were determined by means of X-ray single crystal data (triclinic space group P1̄ - Qi 1, Z = 2). The final R for the 2223, 2496, 2440, 1461, and 3433 observed reflections are 0.043, 0.068, 0.025, 0.055, and 0.028, respectively. The bivalent metal ions (three types) are octahedrally coordinated by the oxygen atoms of adjacent SO3 2- ions (two types, both monodentate), OH- groups, and water molecules. The arrangement of the two OH- groups is trans, and of OH- and H2O cis with respect to the octahedral coordination. The mean metal oxygen distances are in the order M - OH2 > M -OSO2 2-> M - OH . The MO6 -octahedra are both vertex and edge sharing, forming two-dimensional networks parallel to (010), which are connected via hydrogen bonds. The water molecules form strong, linear, nearly symmetric (mm 2) hydrogen bonds to SO3 2- ions, the hydroxide ions weak bonds to water molecules.