Fig. 8. ESI mass spectra of a 100 μM solution of the parent compound in H2O recorded after different reaction times. The initial peak at m/z 660.45 decreases over days with a simultaneous increase of signals at m/z 682.75 and 1024.15 assigned to the −3 and −2 charge states of {V10As12O40}. Peaks with additional oxygen/water molecules were also observed such as the ion at m/z 700.45.
