Add time:08/19/2019         Source:sciencedirect.com

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.

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