MULTINUCLEAR NMR-STUDIES OF V2O5-CS2S2O7 MELTS

Cs-133, O-17 and V-51 static and MAS NMR spectra have been obtained on the solid and molten Cs2S2O7-V2O5 catalyst model system in the compos ition range X(V2O5) = 0-0.5 and at temperatures up to 550 degrees C. I n addition Cs-133 and V-51 NMR spectra of several vanadates and oxosul fatovanadates(V) are reported. The results indicate that monomeric, di meric and polymeric V(V) complexes, possibly VO2SO4-, (VO)(2)O(SO4)(4) (4-) and (VO2SO4)(n)(n-), are formed in the system by increasing mole fraction X(V2O5). For the first time the V-51 NMR spectra of V2O5 diss olved in molten pyrosulfates are reported.