Infrared spectra of the NO3- anion in NaClO4, Na2SO4, NaClO3, and NaIO3 host structures

Abstract

The planar NO3- ion (own symmetry D3h) was embedded in NaClO4, Na2SO4, NaClO3 and NaIO3 host structures containing tetrahedral (Td) or pyramidal (C3v) anions, and its infrared spectra were interpreted in terms of group analysis of the crystal symmetry. Where the correlation is satisfied, viz. in NaClO4, NaClO3 and NaIO3, the NO3- anion possesses the site symmetry of the host structure (C2v, C3 and Cs, respectively), whereas in Na2SO4 an additional symmetry lowering takes place (D2 → C2).