Title: Heterometallic Tetranuclear [Ln(2)(III)Co(2)(III)] Complexes Including Suppression of Quantum Tunneling of Magnetization in the [(Dy2Co2III)-Co-III] Single Molecule Magnet
Authors: Langley, Stuart K ×
Chilton, Nicholas F
Ungur, Liviu
Moubaraki, Boujemaa
Chibotaru, Liviu
Murray, Keith S #
Issue Date: 2012
Series Title: INORGANIC CHEMISTRY vol:51 issue:21 pages:11873-11881
Abstract: Using a heterometallic approach the synthesis, structures, and magnetic properties are reported for the complexes [LnIII2CoIII2(OMe)2(teaH)2(O2CPh)4(MeOH)4](NO3)2·MeOH·H2O {Ln = Gd (1a), Tb (2a), and Dy (3a)} and [LnIII2CoIII2(OMe)2(teaH)2(O2CPh)4(MeOH)2(NO3)2]·MeOH·H2O {Ln = Gd (1b), Tb (2b), and Dy (3b)}. Both compounds for the respective lanthanide ions are found to be isolated within the same crystal. Each LnIII dinuclear unit is incorporated within a diamagnetic CoIII/organic ligand backbone utilizing triethanolamine and benzoic acid as bridging ligands. Magnetic studies reveal an absence of any observable coupling interaction for the Gd case. The Dy analogue displays single molecule magnet (SMM) behavior with a large energy barrier to magnetization reversal of 88.8 K, and the quantum tunneling of the magnetization (QTM) is effectively suppressed because of the nonmagnetic exchange ground state of the molecule. Dilution of the Dy complex into an isostructural diamagnetic yttrium matrix allowed us to determine aspects of the relaxation mechanism within the system.
ISSN: 0020-1669
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Quantum Chemistry and Physical Chemistry Section
× corresponding author
# (joint) last author

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