Single‐Molecule Magnet Behavior of Individual Polyoxometalate Molecules Incorporated within Biopolymer or Metal–Organic Framework Matrices |
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| Authors: | Dr Eric Rivière Shu Yang Dr Catherine Roch‐Marchal Dr Anne Dolbecq Dr Corine Simonnet‐Jégat Prof Nathalie Steunou Dr Nathalie Leclerc‐Laronze Prof Laurent Ruhlmann Prof Talal Mallah Dr Wolfgang Wernsdorfer Prof Pierre Mialane |
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| Affiliation: | 1. Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS, Université Paris Saclay, Orsay cedex, France;2. Université de Strasbourg, Institut de Chimie, UMR CNRS 7177, Laboratoire d'Electrochimie et de Chimie Physique du Corps Solide, Strasbourg cedex, France;3. Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, Versailles cedex, France;4. CNRS and Université Grenoble Alpes, Institut Néel, Grenoble, France |
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| Abstract: | The chemically and structurally highly stable polyoxometalate (POM) single‐molecule magnet (SMM) (FeW9O34)2Fe4(H2O)2]10? (Fe6W18) has been incorporated by direct or post‐synthetic approaches into a biopolymer gelatin (Gel) matrix and two crystalline metal–organic frameworks (MOFs), including one diamagnetic (UiO‐67) and one magnetic (MIL‐101(Cr)). Integrity of the POM in the Fe6W18@Gel, Fe6W18@UiO‐67 and Fe6W18@MIL‐101(Cr) composites was confirmed by a set of complementary techniques. Magnetic studies indicate that the POMs are magnetically well isolated. Remarkably, in Fe6W18@Gel, the SMM properties of the embedded molecules are close to those of the crystals, with clear quantum tunneling steps in the hysteresis loops. For the Fe6W18@UiO‐67 composite, the molecules retain their SMM properties, the energy barrier being slightly reduced in comparison to the crystalline material and the molecules exhibiting a tunneling rate of magnetization significantly faster than for Fe6W18@Gel. When Fe6W18 is introduced into MIL‐101(Cr), the width of the hysteresis loops is drastically reduced and the quantum tunneling steps are smeared out because of the magnetic interactions between the antiferromagnetic matrix and the SMM guest molecules. |
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| Keywords: | biopolymers magnetic properties metal– organic frameworks polyoxometalates |
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