54531-21-4Relevant academic research and scientific papers
Room-temperature form of manganese hexafluorosilicate hexahydrate: A new model with submicroscopic twinning
Torii, Akira,Ogawa, Kazuhide,Tamura, Hatsue,Osaki, Kenji
, p. 833 - 836 (1997)
A new model of MnSiF6.6H2O is presented which reproduces the 'weak' h0l reflections not explained with the 'antiphase domain' model by Chevrier [Acta Cryst. (1991), B47, 224-228]. Good agreement for the 'weak' reflections was obtained by assuming a sort of submicroscopic twinning. The average distances are Mn - O 2.15, Si - F 1.69 and O...F 2.78 A.
Hexaaqua dipositive ions of the first transition series: New and accurate structures; expected and unexpected trends
Cotton, F. Albert,Daniels, Lee M.,Murillo, Carlos A.,Quesada, Jaime F.
, p. 4861 - 4867 (2008/10/08)
An accurate, X-ray crystallographic redetermination of the structures of both the ammonium Tutton salts and the hexafluorosilicates of the divalent hexaaqua species that are formed by the elements of the first transition series, namely, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn, is presented here. For the Tutton salts, the metal-to-water bond distances show minima at vanadium and nickel as expected from ligand field theory considerations. For the second series of compounds, vanadium and chromium deviate unexpectedly from the pattern. A comparison of the variation of the metal-to-water distances in other hexaaqua compounds is also given and the general trends are discussed. Special attention is given to the suppression of the Jahn-Teller effect in the hexaaqua hexafluorosilicate compounds of Cr(II) and Cu(II).
