A Heterometallic FeII–DyIII Single-Molecule Magnet with a Record Anisotropy Barrier

Liu, J-L; Wu, J-Y; Chen, Y-C; Mereacre, V; Powell, AK; Ungur, Liviu; Chibotaru, Liviu; Chen, X-M; Tong, M-L

doi:10.1002/anie.201407799

A Heterometallic FeII–DyIII Single-Molecule Magnet with a Record Anisotropy Barrier

Author:

Liu, J-L

Wu, J-Y ; Chen, Y-C ; Mereacre, V ; Powell, AK ; Ungur, Liviu ; Chibotaru, Liviu ; Chen, X-M ; Tong, M-L

Keywords:

Science & Technology, Physical Sciences, Chemistry, Multidisciplinary, Chemistry, ab initio calculations, anisotropy barriers, ferromagnetic interactions, magnetic properties, Mossbauer spectroscopy, single-molecule magnet, HIGH-SPIN IRON(II), PARAMAGNETIC RELAXATION, ZERO-FIELD, COMPLEXES, SYMMETRY, ION, EXCHANGE, MAGNETIZATION, CLUSTERS, BLOCKING, Mössbauer spectroscopy, 03 Chemical Sciences, Organic Chemistry, 34 Chemical sciences

Abstract:

A record anisotropy barrier (319 cm(-1) ) for all d-f complexes was observed for a unique Fe(II) -Dy(III) -Fe(II) single-molecule magnet (SMM), which possesses two asymmetric and distorted Fe(II) ions and one quasi-D5h Dy(III) ion. The frozen magnetization of the Dy(III) ion leads to the decreased Fe(II) relaxation rates evident in the Mössbauer spectrum. Ab initio calculations suggest that tunneling is interrupted effectively thanks to the exchange doublets.