Comparative Spectroscopic and Electrochemical Study of V(V)-Substituted Keggin-Type Phosphomolybdates and -Tungstates

Vanadium-substituted Keggin-type heteropolyanions have been studied for a wide variety of applications, ranging from catalysis to antiviral/antimicrobial agents. While the V-substituted phosphomolybdates [PVxMo12−xO40](3+x)− well investigated in this context, comparatively little is known about corresponding phosphotungstates [PVxW12-xO40](3+x)−. We succeeded synthesizing sodium salts whole series [PVxW12−xO40](3+x)−, x = 1 6, and characterised them spectroscopically (FT-IR, UV-Vis, 31P-, 51V-NMR) electrochemically (CV SWV). Thereby, direct comparisons between vanadium-substituted -tungstates, with substitution degrees can be established, which provides solid basis further investigations potential applications.