Slow Magnetic Relaxation and Single-Molecule Toroidal Behaviour in a Family of Heptanuclear {CrIII LnIII6 } (Ln=Tb, Ho, Er) Complexes

Kuduva R Vignesh; Stuart K Langley; Abinash Swain; Boujemaa Moubaraki; Marko Damjanović; Wolfgang Wernsdorfer; Gopalan Rajaraman; Keith S Murray

doi:10.1002/anie.201711844

Slow Magnetic Relaxation and Single-Molecule Toroidal Behaviour in a Family of Heptanuclear {Cr^III Ln^III₆ } (Ln=Tb, Ho, Er) Complexes

Angew Chem Int Ed Engl. 2018 Jan 15;57(3):779-784. doi: 10.1002/anie.201711844. Epub 2017 Dec 20.

Authors

Kuduva R Vignesh¹, Stuart K Langley², Abinash Swain³, Boujemaa Moubaraki⁴, Marko Damjanović^{5

6}, Wolfgang Wernsdorfer^{5

6}, Gopalan Rajaraman³, Keith S Murray⁴

Affiliations

¹ IITB-Monash Research Academy, IIT Bombay, Powai, Mumbai, Maharashtra, 400076, India.
² School of Science and the Environment, Division of Chemistry, Manchester Metropolitan University, Manchester, UK.
³ Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra, 400 076, India.
⁴ School of Chemistry, Monash University, Clayton, Victoria, 3800, Australia.
⁵ Institute Néel, CNRS, Université Grenoble Alpes, 25 rue des Martyrs, F-38000, Grenoble, France.
⁶ Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.

PMID: 29205765
DOI: 10.1002/anie.201711844

Abstract

The synthesis, magnetic properties, and theoretical studies of three heterometallic {Cr^III Ln^III₆ } (Ln=Tb, Ho, Er) complexes, each containing a metal topology consisting of two Ln₃ triangles connected via a Cr^III linker, are reported. The {CrTb₆ } and {CrEr₆ } analogues display slow relaxation of magnetization in a 3000 Oe static magnetic field. Single-crystal measurements reveal opening up of the hysteresis loop for {CrTb₆ } and {CrHo₆ } molecules at low temperatures. Ab initio calculations predict toroidal magnetic moments in the two Ln₃ triangles, which are found to couple, stabilizing a con-rotating ferrotoroidal ground state in Tb and Ho examples and extend the possibility of observing toroidal behaviour in non Dy^III complexes for the first time.

Keywords: chromium; clusters; dipolar coupling; lanthanides; single-molecule magnets.

Publication types

Research Support, Non-U.S. Gov't