[ReF6]2−: A Robust Module for the Design of Molecule‐Based Magnetic Materials1. Issue 5 (21st January 2014)

• Record Type: Journal Article
• Authors: Pedersen, Kasper S.; Sigrist, Marc; Sørensen, Mikkel A.; Barra, Anne‐Laure; Weyhermüller, Thomas; Piligkos, Stergios; Thuesen, Christian Aa.; Vinum, Morten G.; Mutka, Hannu; Weihe, Høgni; Clérac, Rodolphe; Bendix, Jesper
• Is Part Of: Angewandte Chemie international edition. Volume 53:Issue 5(2014)
• Page Start: 1351
• Page End: 1354
• Publication Date: 2014-01-21
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201309981
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>A facile synthesis of the [ReF₆]²⁻ ion and its use as a building block to synthesize magnetic systems are reported. Using dc and ac magnetic susceptibility measurements, INS and EPR spectroscopies, the magnetic properties of the isolated [ReF₆]²⁻ unit in (PPh₄)₂[ReF₆]⋅2 H₂O (<bold>1</bold>) have been fully studied including the slow relaxation of the magnetization observed below ca. 4 K. This slow dynamic is preserved for the one‐dimensional coordination polymer [Zn(viz)₄(ReF₆)]_∞ (<bold>2</bold>, viz=1‐vinylimidazole), demonstrating the irrelevance of low symmetry for such magnetization dynamics in systems with easy‐plane‐type anisotropy. The ability of fluoride to mediate significant exchange interactions is exemplified by the isostructural [Ni(viz)₄(ReF₆)]_∞ (<bold>3</bold>) analogue in which the ferromagnetic Ni^II–Re^IV interaction (+10.8 cm⁻¹) dwarfs the coupling present in related cyanide‐bridged systems. These results reveal [ReF₆]²⁻ to be an unique new module for the design of molecule‐based magnetic materials.</p> </abstract>