Water‐soluble and Halogen‐free Hexaammine Complexes of Metal Ions of Group 9 – Synthesis,Crystal Structures,and Vibrational Spectra |
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| Authors: | Michael Gorol,Nadia C. Mö sch‐Zanetti,Mathias Noltemeyer,Herbert W. Roesky |
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| Abstract: | Reaction of [M(NH3)6]Cl3 (M = Co, Rh, Ir) and [Ir(NH3)5(OH2)]Cl3 with (NH4)2C2O4 · H2O in aqueous solution resulted in the isolation of [M(NH3)6]2(C2O4)3 · 4 H2O and [Ir(NH3)5(OH2)]2(C2O4)3 · 4 H2O, respectively. The complexes have been characterized by X‐ray crystallography, IR and UV/VIS spectroscopy. The isomorphous compounds crystallize in the orthorhombic space group Pnnm (No. 58). Four molecules of crystal water are involved in an extended three‐dimensional hydrogen bonding network. The librational modes of the lattice water around 600 cm–1 allow the characterization of [Ir(NH3)6]2(C2O4)3 · 4 H2O and [Ir(NH3)5(OH2)]2(C2O4)3 · 4 H2O, respectively, by IR spectroscopy. The band around 600 cm–1 shows a significant frequency shift in the IR spectra of the hexaammine and aquapentaammine complex of iridium(III) and, by that, a distinction is possible. |
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| Keywords: | Iridium Hexaammine complexes Crystal structure Vibrational spectroscopy |
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