ABOSRPTION SPECTRUM OF POTASSIUM HEXAFLUORONICKELATE (4) - ELECTRONIC SPECTRA

Compounds of the formula M2NiF6 containing tetravalent nickel and the three heavy alkali metals were prepared and their electronic spectra studied. The observed peaks were assigned to the crystal-field energy levels for an octahedral low-spin d6 configuration. The crystal-field parameters for K2NiF6 are Dq = 2090 cm-1 and B = 485 cm-1. The fine structure components appearing on the 1A1v → 1T1 transition have been correlated with data for the ground state vibrational frequencies, and the occurrence of a Jahn-Teller distortion is postulated for this level. © 1969.