Changeover during in situ compositional modulation of hexacyanoferrate (Prussian blue) material

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Bueno, Paulo Roberto [1 ]
Giménez-Romero, David [2 ]
Gabrielli, Claude [2 ]
García-Jareño, José Juan [3 ]
Perrot, Hubert [2 ]
Vicente, Francisco [3 ]
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[1] Instituto de Química, Departamento de Físico-Química, Universidade Estadual Paulista, P.O. Box 355, 14801-907, Araraquara, Sao Paulo, Brazil
[2] UPR 15 du CNRS, Laboratoire Interface et Système Electrochimique, 4 place Jussieu, 75252 Paris, France
[3] Departament de Química Física, Universitat de València, C/ Dr Moliner, 50, 46100, Burjassot, València, Spain
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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. © 2006 American Chemical Society;
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页码:17146 / 17152
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