Abstract
The versatile NO 2 - ligand is a chelating, bidentate ligand in the high symmetry M 2M′Eu(NO 2) 6 (M = Cs, Rb; M′ = Na, Li) systems. The investigation of the vibronic structure and energy levels of these systems is of interest for comparison with the abundant data from Cs 2NaEuX 6 (X = F, Cl) crystals. The vibrational structure in the electronic emission spectra of the hexanitritolanthanates has been investigated from the analysis of the 10 K and 100 K spectra. Most of the vibronic intensity of the 5D 0 → 7F 0, 7F 2 transitions is due to low energy skeletal modes which correlate with τ u ( T h ) infrared vibrations. The energy levels derived from the vibronic analysis indicate a weak crystal field in these systems.
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