title: Single-Molecule Magnet Behavior of Individual Polyoxometalate Molecules Incorporated within Biopolymer or Metal-Organic Framework Matrices.
abstract: The chemically and structurally highly stable polyoxometalate (POM) single-molecule magnet (SMM) [(FeW9 O34 )2 Fe4 (H2 O)2 ](10-) (Fe6 W18 ) 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 Fe6 W18 @Gel, Fe6 W18 @UiO-67 and Fe6 W18 @MIL-101(Cr) composites was confirmed by a set of complementary techniques. Magnetic studies indicate that the POMs are magnetically well isolated. Remarkably, in Fe6 W18 @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 Fe6 W18 @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 Fe6 W18 @Gel. When Fe6 W18 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.
authors.affiliation: Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France.
authors.forename: William
authors.initials: W
authors.lastname: Salomon
authors.affiliation: CNRS and Université Grenoble Alpes, Institut Néel, 38042, Grenoble, France.
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Lan
authors.affiliation: Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS, Université Paris Saclay, Université Paris Sud 11, 91405, Orsay cedex, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Rivière
authors.affiliation: Université de Strasbourg, Institut de Chimie, UMR CNRS 7177, Laboratoire d'Electrochimie et de Chimie Physique du Corps Solide, 4 Rue Blaise Pascal, CS 90032, 67081, Strasbourg cedex, France.
authors.forename: Shu
authors.initials: S
authors.lastname: Yang
authors.affiliation: Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France.
authors.forename: Catherine
authors.initials: C
authors.lastname: Roch-Marchal
authors.affiliation: Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France.
authors.forename: Anne
authors.initials: A
authors.lastname: Dolbecq
authors.affiliation: Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France.
authors.forename: Corine
authors.initials: C
authors.lastname: Simonnet-Jégat
authors.affiliation: Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Steunou
authors.affiliation: Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Leclerc-Laronze
authors.affiliation: Université de Strasbourg, Institut de Chimie, UMR CNRS 7177, Laboratoire d'Electrochimie et de Chimie Physique du Corps Solide, 4 Rue Blaise Pascal, CS 90032, 67081, Strasbourg cedex, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Ruhlmann
authors.affiliation: Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182 CNRS, Université Paris Saclay, Université Paris Sud 11, 91405, Orsay cedex, France. talal.mallah@u-psud.fr.
authors.forename: Talal
authors.initials: T
authors.lastname: Mallah
authors.affiliation: CNRS and Université Grenoble Alpes, Institut Néel, 38042, Grenoble, France. wolfgang.wernsdorfer@neel.cnrs.fr.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wernsdorfer
authors.affiliation: Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles cedex, France. pierre.mialane@uvsq.fr.
authors.forename: Pierre
authors.initials: P
authors.lastname: Mialane
keywords: biopolymers; magnetic properties; metal-organic frameworks; polyoxometalates