The calculated DOS of R-PW is shown in Figure spin states, which lies directly on top of the Fermi energy. These are the a 1g -states newly filled in the transition from Prussian blue to Prussian White, causing a transition from the semiconducting to conducting behavior. Furthermore, a small contribution of carbon p-states can be observed, which hints at the strong π-bonding interactions present in this material class. The DOS of cubic Prussian white is similar to the rhombohedral crystal structure except for the shift in the Fermi energy and consequently the occupation of the minority a 1g -states (the calculated DOS of C-PW is provided in the supplementary information in Figure ).