Slow Magnetic Relaxation in Octahedral Cobalt(II)
Field-Induced Single-Ion Magnet with Positive Axial and Large Rhombic
Anisotropy
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Abstract
Pseudooctahedral
mononuclear cobat(II) complex [Co(abpt)<sub>2</sub>(tcm)<sub>2</sub>] (<b>1</b>), where abpt = 4-amino-3,5-bis(2-pyridyl)-1,2,4-triazole
and tcm = tricyanomethanide anion, shows field-induced slow relaxation
of magnetization with <i>U</i> = 86.2 K and large axial
and rhombic single-ion zero-field-splitting parameters, <i>D</i> = +48(2) cm<sup>–1</sup> and <i>E</i>/<i>D</i> = 0.27(2) (<i>D</i> = +53.7 cm<sup>–1</sup> and <i>E</i>/<i>D</i> = 0.29 from ab initio CASSCF/NEVPT2
calculations), thus presenting a new example of a field-induced single-ion
magnet with transversal magnetic anisotropy