Synthesis, spectroscopic and structural characterisation of periodate complexes of iron(III)
Abstract
The reaction of Fe(NO3)3·9H2O with NalO4 in aqueous acid solution gave brown [Fe4I3O24H15] and subsequent reaction with concentrated alkalis formed Mn[Fe4l3O24H15–n](M = Li, Na, K, Rb or Cs). The crystal structure of K6Na2[Fe4l3O24H7]·14H2O has been determined and shown to contain an Anderson-type anion composed of seven edge-linked octahedra. In the crystal studied a central FeO6 group is surrounded by six disordered FeO6 and IO6 groups. All the prepared salts have been shown to contain a similar anion based upon spectroscopic data, iron and iodine K-edge extended X-ray absorption fine structure data, and the 57Fe Mössbauer spectra.