Slow Magnetic Relaxation and Single-Molecule Toroidal Behaviour in a Family of Heptanuclear {CrIII LnIII6 } (Ln=Tb, Ho, Er) Complexes.
The synthesis, magnetic properties, and theoretical studies of three heterometallic {CrIII LnIII6 } (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.
['Vignesh|Kuduva R|KR|', 'Langley|Stuart K|SK|', 'Swain|Abinash|A|', 'Moubaraki|Boujemaa|B|', 'Damjanović|Marko|M|', 'Wernsdorfer|Wolfgang|W|', 'Rajaraman|Gopalan|G|0000-0001-6133-3026', 'Murray|Keith S|KS|0000-0003-4098-9389']
chromium clusters dipolar coupling lanthanides single-molecule magnets