A Topochemical Approach to Synthesize Layered Materials Based on the Redox Reactivity of Anionic Chalcogen Dimers |
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| Authors: | Dr. Shunsuke Sasaki Dr. Dalel Driss Elodie Grange Dr. Jean‐Yves Mevellec Dr. Maria Teresa Caldes Dr. Catherine Guillot‐Deudon Dr. Sylvian Cadars Dr. Benoît Corraze Dr. Etienne Janod Dr. Stéphane Jobic Dr. Laurent Cario |
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| Affiliation: | Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, Nantes Cedex 3, France |
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| Abstract: | Layered transition metal compounds represent a major playground to explore unconventional electric or magnetic properties. In that framework, topochemical approaches that mostly preserve the topology of layered reactants have been intensively investigated to tune properties and/or design new materials. Topochemical reactions often involve the insertion or deinsertion of a chemical element accompanied by a change of oxidation state of the cations only. Conversely, cases where anions play the role of redox centers are very scarce. Here we show that the insertion of copper into two dimensional precursors containing chalcogen dimers (Q2)2? (Q=S, Se) can produce layered materials with extended (CuQ) sheets. The reality of this topochemical reaction is demonstrated here for different pristine materials, namely La2O2S2, Ba2F2S2, and LaSe2. Therefore, this work opens up a new synthetic strategy to design layered transition metal compounds from precursors containing polyanionic redox centers. |
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| Keywords: | Layered compounds Polychalcogenides Redox chemistry Solid-state reactions Topochemistry |
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