Synthesis, characterisation and voltammetric study of a #beta#-Keggin-type [PW_(12)O_(40)]~(3-) complex

摘要

The Keggin-type #beta#-[PW_(12)O_(40)]~(3-) complex was prepared, and the voltammetric behavior was compared with that of the Keggin-type #alpha#-[PW_(12)O_(40)]~(3-) complex. Both complexes underwent a four-step one-electron reduction in CH_3CN where no protonation accompanied reduction. With the addition of CF_3SO_3H, the one-electron reduction waves were converted into two two-electron waves, followed by an ill-defined wave. The addition of water to the CH_3CN + CF_3SO_3H system caused the first two-electron wave to split into two one-electron waves. The effect of acid or water on the voltammetric behavior is discussed also.