The geometry of the H5O2+ lon in (H5O2+)3(PW12O403–) studied by lnelastic neutron scattering vibrational spectroscopy

Abstract

The inelastic neutron scattering spectrum of dodecatungstophosphoric acid hexahydrate shows the presence of at least one type of H₅O₂⁺ ion, and most of the normal co-ordinates of a near-planar H₅O₂⁺ ion can be fitted to the observed spectrum, except that in the spectral region of the terminal HOH deformations, there is disagreement between the observed and calculated profiles; this is taken as evidence of disorder of the oxygen atoms about the planar positions.