Photoinduced chromism of a Zinc-Iron cyanide at room temperature

A room temperature photoinduced chromism of a Prussian blue analog, K0.26Zn2.87[Fe(CN)6]2·7.2H2O, was observed for the first time by the illumination of ~ 250-450 nm light. The mechanism of this chromism is caused by the charge transfer from CN− to Fe3 + as manifested by IR and XPS measurements.97