Crystal Structure and Magnetic Property of Manganese(II) Hexafluorosilicate Hexahydrate

The chemistry of manganese complexes has attracted much attention of many researchers because of the various oxidation numbers and diverse nuclearities, having relevance to model complexes of active centers in manganese enzymes, such as Mn SOD (superoxide dismutase), Mn catalase, and Mn4CaO5 cluster in Photosystem II.1–3 Manganese(II) hexafluorosilicate may be useful as one of the metal source to make manganese complexes. However, the crystal structure of this metal source has not yet been disclosed so far. To our knowledge, unexpectedly only one report concerning manganese(II) triflate has appeared in the literature concerning crystal structures of simple manganese(II) salts.4 In this study, we determined the crystal structure of manganese(II) hexafluorosilicate hexahydrate, which shows an octahedral hexaaquamanganese(II) ion with an octahedral hexafluorosilicate ion, as shown in Fig. 1. This paper describes the crystal structure and temperature dependence of the magnetic susceptibility of [Mn(H2O)6]SiF6 (1). Manganese(II) hexafluorosilicate hexahydrate was recrystallized from distilled water to give pale-pink crystals. IR (cm–1): ν(OH) 3400 (br), δ(H2O) 1624 (s), ν(SiF) 743 (s), 469 (s). A preliminary examination was made, and data were collected 2020 © The Japan Society for Analytical Chemistry