Effect of Pressure on the Spectra of Certain Complexes of Cu++, Co+++, and Fe++

Abstract

The effect of pressure is as measured on the spectra of four Cu⁺⁺ salts, and on K₃COF₆ and FeSiF₆·6H₂O. The four Cu⁺⁺ salts have varying degrees of distortion from octahedral (or tetrahedral) symmetry. For the Tutton's salt (the more distorted octahedral complexes) there were measurably larger effects on the shift and especially on the intensity of the transition. The Co³⁺ and Fe⁺⁺ systems were compared to investigate the possibility of crossover from spin free to spin paired arrangement in the former. From the data it is estimated that this should occur at 220–250 kbar.