Preparation and infrared spectra of some ammine complexes of ruthenium(II) and ruthenium(III)

The infrared spectra of the complexes [Ru(NH 3 ) 6 ]X 2 and [Ru(NH 3 ) 6 ]X 3 , where X = Cl − , Br − , I − , BF 4 − and [Ru(NH 3 ) 5 X]X 2 , where X = Cl − , Br − and I − , have been measured in the solid state between 4 000 - 250 cm −1 . Assignments have been made for the observed absorption bands. The metal-nitrogen stretching vibrations were observed between 485-424 cm −1 for the ruthenium(III) complexes but were not observed for the ruthenium(II) complexes in this region.