Slow Magnetic Relaxation and Single-Molecule Toroidal Behaviour in a Family of Heptanuclear {CrIIILnIII6} (Ln=Tb, Ho, Er) Complexes

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

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Abstract

The synthesis, magnetic properties, and theoretical studies of three heterometallic {CrIIILnIII6} (Ln=Tb, Ho, Er) complexes, each containing a metal topology consisting of two Ln3 triangles connected via a CrIII 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 DyIII complexes for the first time.

Original languageEnglish
Pages (from-to)779-784
Number of pages6
JournalAngewandte Chemie - International Edition
Volume57
Issue number3
DOIs
Publication statusPublished - 15 Jan 2018

Keywords

  • chromium
  • clusters
  • dipolar coupling
  • lanthanides
  • single-molecule magnets

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