Solvent-effect on the interconversion among one-, two- and four-electron reduction waves for the 18-molybdodiphosphate complex, [(P2O7)Mo18O54]4−

Abstract

Abstract For the [(P 2 O 7 )Mo 18 O 54 ] 4− complex, the presence of small cations such as H + , Li + and Na + caused one-electron waves to be converted into four- and two-electron waves in a complex manner. With the addition of a trace amount of H + , a four-electron reduction wave was obtained in solvents of weaker basicity like acetone, acetonitrile and propylene carbonate (PC); the relative permittivity did not affect the appearance of the four-electron wave. On the other hand, two-electron waves were obtained in solvents of stronger basicity like N,N -dimethylformamide (DMF), N,N -dimethylacetamide (DMA), and N -methylpyrrolidinone (NMP). With the addition of Li + or Na + , the one-electron waves were converted into two-electron waves only in acetone, indicating that the conversion can occur in solvents of both weak basicity and low relative permittivity.