¹²⁷I NQR in some iodic acid compunds

Abstract

127I NQR frequencies have been measured in 20 compounds including iodates, chromate‐iodates and tri‐iodates. Quadrupole coupling constants and asymmetry parameters have been calculated at 77°K. Lines have been assigned by the two‐frequency method. NQR data show the presence of covalent bonds in iodates and tri‐iodates. In chromate‐iodates the large value of the asymmetry parameter is due to the non‐equivalence of an oxygen atom in the IO3− ion.