Hexanitrolanthanates(III)

Abstract

Unit-cell parameters have been measured for some alkali-metal hexanitrolanthanates. The electronic spectra of these complexes closely resemble that of NaNO₂, as expected for very weak lanthanide–nitrite bonding, although the lowest triplet absorption is much more intense than in NaNO₂. Ce(NO₂)₆^3– shows metal–ligand electron transfer bands at 23·5 and 29 kK. The absence from the i.r. and Raman spectra of δ(NO₂)w and ν(Ln–N) and the relative energies of the lattice modes between compounds are consistent with weak bonding.