Photoinduced Ferrimagnetic Systems in Prussian Blue Analogues CIxCo4[Fe(CN)6]y (CI = Alkali Cation). 1. Conditions to Observe the Phenomenon
Journal of the American Chemical Society2000Vol. 122(28), pp. 6648–6652
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Anne Bleuzen, Claire Lomenech, Virginie Escax, Françoise Villain, F. Varret, Christophe Moulin, Michel Verdaguer
Abstract
Photoinduced magnetization has been recently evidenced by Hashimoto et al. in CoFe Prussian blue analogues. We synthesized three compounds with a variable cobalt environment to point out the conditions required to observe the photoinduced magnetization. Structure and electronic structure of the compounds have been 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−NC−FeII are necessary for the existence of the photoinduced magnetization, but their presence is not a sufficient condition. The role of hexacyanoferrate vacancies in the phenomenon is pointed out.
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