A Novel Family of Triangular Co II 2 Ln III and Co II 2 Y III Clusters by the Employment of Di-2-Pyridyl Ketone
Constantinos G. Efthymiou, Áine Ní Fhuaráin, Júlia Mayans and 3 more
Magnetochemistry · 2019
doi:10.3390/magnetochemistry5020035 (opens in a new tab)
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Abstract
The synthesis, structural characterization and magnetic study of novel Co<sup>II</sup>/4f and Co<sup>II</sup>/Y<sup>III</sup> clusters are described. In particular, the initial employment of di-2-pyridyl ketone, (py)<sub>2</sub>CO, in mixed metal Co/4f chemistry, provided access to four triangular clusters, [Co<sup>II</sup><sub>2</sub>M<sup>III</sup>{(py)<sub>2</sub>C(OEt)(O)}<sub>4</sub>(NO<sub>3</sub>)(H<sub>2</sub>O)]<sub>2</sub>[M(NO<sub>3</sub>)<sub>5</sub>](ClO<sub>4</sub>)<sub>2</sub> (M = Gd, <b>1</b>; Dy, <b>2</b>; Tb, <b>3</b>; Y, <b>4</b>), where (py)<sub>2</sub>C(OEt)(O)<sup>−</sup> is the monoanion of the hemiketal form of (py)<sub>2</sub>CO. Clusters <b>1</b>−<b>4</b> are the first reported Co/4f (<b>1</b>−<b>3</b>) and Co/Y (<b>4</b>) species bearing (py)<sub>2</sub>CO or its derivatives, despite the fact that over 200 metal clusters bearing this ligand have been reported so far. Variable-temperature, solid-state dc and ac magnetic susceptibility studies were carried out on <b>1</b>−<b>4</b> and revealed the presence of weak ferromagnetic exchange interactions between the metal ions (<i>J</i><sub>Co-Co</sub> = +1.3 and +0.40 cm<sup>−1</sup> in <b>1</b> and <b>4</b>, respectively; <i>J</i><sub>Co-Gd</sub> = +0.09 cm<sup>−1</sup> in <b>1</b>). The ac susceptibility studies on <b>2</b> revealed nonzero, weak out-of-phase (χ’’<sub>M</sub>) signals below ~5 K.
Abstract licence: CC BY
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