A spectroscopic study of vibrations in crystalline compounds [Me(NH₃)₆] <i>X</i>₂

Abstract

Abstract Infra‐red and Raman spectra of [Me(NH 3 ) 6 ] X 2 crystals were measured for Me  Co, Ni and X  Cl, Br, I. BF 4 , ClO 4 , PF 6 . The bands obtained were interpreted as being connected with vibrations of the [Me(NH 3 ) 6 ] octahedron. A far infra‐red band at ca. 80 cm −1 was interpreted as an IR active lattice mode. A lattice dynamics model based on electrostatic interactions between point ions was developed. A low frequency Raman active lattice mode was theoretically foreseen by this model.