. . . . . . . . . . . "Photoinduced magnetization has been recently evidenced by Hashimoto et al. in CoFe Prussianblue analogues. We synthesized three compounds with a variable cobalt environment to point out the conditionsrequired to observe the photoinduced magnetization. Structure and electronic structure of the compounds havebeen investigated combining XANES, infrared spectroscopy, and powder X-ray diffraction experiments.Magnetization as a function of temperature before and after irradiation showed that diamagnetic pairs CoIII\u2212NC\u2212FeII are necessary for the existence of the photoinduced magnetization, but their presence is not a sufficientcondition. The role of hexacyanoferrate vacancies in the phenomenon is pointed out." . . "Photoinduced Ferrimagnetic Systems in Prussian Blue AnaloguesCIxCo4[Fe(CN)6]y (CI = Alkali Cation). 1. Conditions to Observe thePhenomenon" . . . . . . . . . . .