A Trinuclear Radical-Bridged Lanthanide Single-Molecule Magnet
Colin A. Gould
Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720 USA
Search for more papers by this authorLucy E. Darago
Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720 USA
Search for more papers by this authorMiguel I. Gonzalez
Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720 USA
Search for more papers by this authorProf. Dr. Selvan Demir
Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
Search for more papers by this authorCorresponding Author
Prof. Dr. Jeffrey R. Long
Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720 USA
Department of Chemical and Biomolecular Engineering, University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA
Search for more papers by this authorColin A. Gould
Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720 USA
Search for more papers by this authorLucy E. Darago
Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720 USA
Search for more papers by this authorMiguel I. Gonzalez
Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720 USA
Search for more papers by this authorProf. Dr. Selvan Demir
Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
Search for more papers by this authorCorresponding Author
Prof. Dr. Jeffrey R. Long
Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720 USA
Department of Chemical and Biomolecular Engineering, University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA
Search for more papers by this authorAbstract
Assembly of the triangular, organic radical-bridged complexes Cp*6Ln3(μ3-HAN) (Cp*=pentamethylcyclopentadienyl; Ln=Gd, Tb, Dy; HAN=hexaazatrinaphthylene) proceeds through the reaction of Cp*2Ln(BPh4) with HAN under strongly reducing conditions. Significantly, magnetic susceptibility measurements of these complexes support effective magnetic coupling of all three LnIII centers through the HAN3−. radical ligand. Thorough investigation of the DyIII congener through both ac susceptibility and dc magnetic relaxation measurements reveals slow relaxation of the magnetization, with an effective thermal relaxation barrier of Ueff=51 cm−1. Magnetic coupling in the DyIII complex enables a large remnant magnetization at temperatures up to 3.0 K in the magnetic hysteresis measurements and hysteresis loops that are open at zero-field up to 3.5 K.
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