51V NMR of inclusion compounds H2V12O31-y �n H2O

Abstract

The parameters of hyperfine interactions on51V nuclei were determined on films of the inclusion compound H2V12O31-y ·n H2O at different stages of hydration. It was established that the axial symmetry plane of the magnetic interaction tensor coincides with the film plane. The most probable direction (40° of the film plane) and the magnitude of the electric field gradient (EFG) on51V nuclei (egQ/h = 0.233 MHz) were found for a completely dehydrated sample. An analysis of the line width angular dependences of satellites has shown the existence of a disorientation of the main EFG direction with a distribution width of about 50° in the film plane. The absence of satellites and the presence of an angular dependence of the51V NMR central signal of hydrated samples allowed the conclusion that the interaction of the V-O layer with molecules of water led to an increase in the disorientation of the film plane.