Bueno PR, Giménez-Romero D, Gabrielli C, García-Jareño JJ, Perrot H, Vicente F. Changeover during in Situ Compositional Modulation of Hexacyanoferrate (Prussian Blue) Material.
J Am Chem Soc 2006;
128:17146-52. [PMID:
17177469 DOI:
10.1021/ja066982a]
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Abstract
This paper describes the importance of (H2O)6 clusters in controlling the properties of hexacyanoferrate (Prussian Blue) materials. A careful in situ study of compositional changes by using electrogravimetric techniques (in ac and dc modes) in hexacyanoferrates containing K+ alkali metals reveals the existence of a changeover in the properties of these films in a narrow potential range. Control of the compositional variation of the changeover is dependent on the K+ stoichiometric number in the compound structure. However, a specific K+ occupation in the compound structure activates the occupation of the (H2O)6 cluster by H3O+ and/or H+, causing the changeover in the properties of hexacyanoferrate film. Thus, the information thus obtained is very useful for understanding the mechanisms involved in the electrochemical reversible switch between ferrimagnetism/paramagnetism, "semiconductor/metal" and electroluminescence/nonelectroluminescence properties of molecular cyanide materials.
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