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- W2005897907 abstract "Durch Kristallisieren aus einer schwefelsauren Losung von Chrom(II)-Sulfat (T ≈ 70°C) ist das hellblaue Trihydrat CrSO4 · 3 H2O erhaltlich. Die Verbindung ist isotyp zu CuSO4 · 3 H2O. Die Strukturverfeinerung anhand von Einkristalldaten erfolgte in der Raumgruppe Cc mit a = 5,7056(8) A, b = 13,211(2) A, c = 7,485(1) A, β = 96,73(1)°, Z = 4 und konvergierte bei R = 3,8%.Cr2+ ist verzerrt oktaedrisch koordiniert. Die Basisflache des Oktaeders wird von drei Hydratsauerstoffatomen und einem Sulfatsauerstoffatom aufgespannt. Zwei weitere Sauerstoffatome von Sulfatgruppen vervollstandigen in einem groseren Abstand die elongierten Oktaeder. Diese sind untereinander uber gemeinsame Sulfatpolyeder verknupft. Dadurch ergeben sich Ketten, in denen CrO6-Oktaeder und SO4-Tetraeder abwechseln. Diese Ketten, deren Orientierung jeweils [110] und [1–10] in c-Richtung wechselt, sind uber Sulfatgruppen und Wasserstoffbruckenbindungen miteinander verbunden.Preparation and Crystal Structure of CrSO4 · 3 H2OEvaporating a solution of Cr2+ in dilute sulphuric acid at 70°C light blue crystals of CrSO4 · 3 H2O were grown. Its x-ray powder diffraction pattern is quite similar to that of CuSO4 · 3 H2O. The crystal structure refinement of CrSO4 · 3 H2O (space group Ce, a = 5.7056(8) A, b = 13.211(2) A, c = 7.485(1) A, β = 96.73(1)°, Z = 4) from single crystal data, using the parameters of the copper compound as starting values, results in a final R-value of R = 3.8%.The surrounding of the Cr2+ ion can be described as a strongly elongated octahedron. The basal plane of the CrO6-octahedron consists of three hydrate oxygen atoms and one sulphate oxygen atom. The two more distant axial oxygen atoms also belong to sulphate groups. Thus they are forming chains of alterning CrO6-octahedra and SO4-tetrahedra along [110] and [1–10] linked via common corners. These chains are connected via sulphate groups and by bridging hydrogen bonds to a 3-dimensional network." @default.
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- W2005897907 date "1990-07-01" @default.
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- W2005897907 title "Zur Darstellung und Kristallstruktur von CrSO4 � 3 H2O" @default.
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- W2005897907 doi "https://doi.org/10.1002/zaac.19905860119" @default.
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