Abstract: | Crystal Structure, Vibrational Spectra, and Normal Coordinate Analysis of K2[IrCl5(NH3)] The X-ray structure determination of K2[IrCl5(NH3)] (orthorhombic, space group Pnma, a = 13.426(4), b = 10.015(2), c = 6.8717(7) Å, Z = 4) revealed the Cs point symmetry of the complex anion [IrCl5(NH3)]2? (Ir? Cl = 2.337–2.365, Ir? N = 2.067(10); N? H = 0.73–0.79 Å). Using the molecular parameters the IR and Raman spectra are assigned by normal coordinate analysis. The valence force constants are fd(NH) = 5.88, fd(IrN) = 2.66, fd(IrCl) = 1.68 mdyn/Å. |