SYNTHESIS AND CHARACTERIZATION OF 15-MOLYBDODIPHOSPHATE

摘要

The formation of a 15-molybdodiphosphate anion was ascertained in a 0.05 M (M = mol dm(-3)) Mo(VI)-0.2 M HCl-4 mM P2O74--40% (vol./vol.) CH3CN system at ambient temperature, and the yellow complex was isolated as a tetrapropylammonium (n-Pr4N+) salt. Once the parent 18-molybdodiphosphate anion, [(P2O7)Mo18O54](4-), was formed in the solution, it transformed spontaneously into the 15-molybdodiphosphate anion, [H-6(P2O7)Mo15O48](4-). The transformation reaction was followed voltammetrically at the glassy carbon (GC) electrode. The rate of transformation, which depended on the concentrations of CH3CN and HCl, on the Mo/P mole ratio, and also on the temperature of the solution, was discussed. The complex was characterized by the voltammetric and IR spectroscopic behaviors. [References: 23]