Add time:08/07/2019 Source:sciencedirect.com
Peach/yellow coloured solids of composition [Co(NH3)6]X·SiF6·nH2O, where X = Cl, Br, I and NO3 were obtained directly by reacting [Co(NH3)6]X3 with Na2SiF6 in 1:1 molar ratio in hot aqueous medium. These hexaamminecobalt(III) complex salts have been characterized by elemental analyses and spectroscopic studies (e.g. UV–vis, IR and 19F NMR). The single crystals of [Co(NH3)6]Cl·SiF6·2H2O suitable for X-ray structure determination were obtained from hot water by slow evaporation at room temperature. Crystal structure determination of this complex salt revealed the presence of discrete ions, i.e. cation [Co(NH3)6]3+ and mixed anions, Cl− and SiF62− and two lattice water molecules in the solid state. Crystal lattice is stabilized by electrostatic forces of attraction and hydrogen bonding interactions. This is the first X-ray structure determination of a hexaamminecobalt(III) salt with fluoroanion, hexafluorosilicate.
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