Infrared Light-Induced Charge Transfer of Prussian Blue Analogs K0.4Co1.3[Fe(CN)6]·nH2O

In this paper, we irradiated K0.4Co1.3[Fe(CN)6]·nH2O with infrared light ([KCoFePBA]IIP) during the preparation process and compared them with normal preparations ([KCoFePBA]NP). XRD results show that the samples conform to the Fm-3 m space group, and the lattice constants are 10.230 Å ([KCoFePBA]NP) and 10.225 Å ([KCoFePBA]IIP), respectively. According to the results of Mössbauer spectroscopy, due to the induction of infrared light during the preparation process, part of the electrons are transferred from Co2+ to Fe3+, the paramagnetic Fe3+ (S = 1/2)-CN-Co2+ (S = 3/2) changes to the diamagnetic Fe2+ (S = 0)-CN-Co3+ (S = 0) by charge transfer. The magnetization measurement shows that the magnetization of [KCoFePBA]IIP is significantly less than that of [KCoFePBA]NP. At 300 K, the theoretical magnetic moments of [KCoFePBA]NP and [KCoFePBA]IIP are 4.60 µB and 4.37 µB, respectively. The difference in magnetism can be attributed to the charge transfer caused by infrared irradiation during the preparation process.