Fig. 7. Difference plot of the final Rietveld refinement for [Ni(en)3]2[As8V12O40(H2O)]·4H2O with a final Rwp of 4.7% and RBragg = 3.7%. The inset shows the polyhedral representation of the cluster anion in the structure of 2. Note: the H2O molecule in the cavity of the cluster is not displayed. Blue: VO5 polyhedra; green: As; red: O.
