[ReF6]2-: a robust module for the design of molecule-based magnetic materials

Kasper Steen Pedersen; Marc Sigrist; Mikkel Agerbæk Sørensen; Anne Laure Barra; Thomas Weyhermuller; Stergios Piligkos; Christian Aagaard Thuesen; Morten G. Vinum; Hannu Mutka; Høgni Weihe; Rodolphe Clerac; Jesper Bendix

doi:10.1002/anie.201309981

[ReF₆]^2-: a robust module for the design of molecule-based magnetic materials

Kasper Steen Pedersen, Marc Sigrist, Mikkel Agerbæk Sørensen, Anne Laure Barra, Thomas Weyhermuller, Stergios Piligkos, Christian Aagaard Thuesen, Morten G. Vinum, Hannu Mutka, Høgni Weihe, Rodolphe Clerac, Jesper Bendix^*

^*Corresponding author for this work

Department of Chemistry

82 Citations (Scopus)

Abstract

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]•2H2O (1) 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(ReF ₆)]1 (2, 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)]1 (3) analogue in which the ferromagnetic NiII-ReIV 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.

Original language	English
Journal	Angewandte Chemie - International Edition
Volume	53
Issue number	5
Pages (from-to)	1351-1354
Number of pages	4
ISSN	1433-7851
DOIs	https://doi.org/10.1002/anie.201309981
Publication status	Published - 2014

Keywords

Coordination polymers
Fluoride
Magnetic anisotropy
Rhenium
Single-molecule magnets

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10.1002/anie.201309981

Cite this

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title = "[ReF6]2-: a robust module for the design of molecule-based magnetic materials",

abstract = "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]•2H2O (1) 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(ReF 6)]1 (2, 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)]1 (3) analogue in which the ferromagnetic NiII-ReIV 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.",

keywords = "Coordination polymers, Fluoride, Magnetic anisotropy, Rhenium, Single-molecule magnets",

author = "Pedersen, {Kasper Steen} and Marc Sigrist and S{\o}rensen, {Mikkel Agerb{\ae}k} and Barra, {Anne Laure} and Thomas Weyhermuller and Stergios Piligkos and Thuesen, {Christian Aagaard} and Vinum, {Morten G.} and Hannu Mutka and H{\o}gni Weihe and Rodolphe Clerac and Jesper Bendix",

year = "2014",

doi = "10.1002/anie.201309981",

language = "English",

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pages = "1351--1354",

journal = "Angewandte Chemie International Edition",

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number = "5",

}

TY - JOUR

T1 - [ReF6]2-

T2 - a robust module for the design of molecule-based magnetic materials

AU - Pedersen, Kasper Steen

AU - Sigrist, Marc

AU - Sørensen, Mikkel Agerbæk

AU - Barra, Anne Laure

AU - Weyhermuller, Thomas

AU - Piligkos, Stergios

AU - Thuesen, Christian Aagaard

AU - Vinum, Morten G.

AU - Mutka, Hannu

AU - Weihe, Høgni

AU - Clerac, Rodolphe

AU - Bendix, Jesper

PY - 2014

Y1 - 2014

N2 - 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]•2H2O (1) 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(ReF 6)]1 (2, 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)]1 (3) analogue in which the ferromagnetic NiII-ReIV 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.

AB - 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]•2H2O (1) 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(ReF 6)]1 (2, 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)]1 (3) analogue in which the ferromagnetic NiII-ReIV 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.

KW - Coordination polymers

KW - Fluoride

KW - Magnetic anisotropy

KW - Rhenium

KW - Single-molecule magnets

U2 - 10.1002/anie.201309981

DO - 10.1002/anie.201309981

M3 - Journal article

C2 - 24459056

AN - SCOPUS:84893935994

SN - 1433-7851

VL - 53

SP - 1351

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JO - Angewandte Chemie International Edition

JF - Angewandte Chemie International Edition

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