General One-Step Self-Assembly
of Isostructural Intermetallic
Co<sup>II</sup><sub>3</sub>Ln<sup>III</sup> Cubane Aggregates
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Abstract
A new family of Co/rare-earth intermetallic cubane aggregates
[Co<sub>3</sub>Ln(hmp)<sub>4</sub>(OAc)<sub>5</sub>H<sub>2</sub>O]
(Ln =
Dy, Ho, Er, Tm, Yb, Y) have been synthesized by self-assembly. Single-crystal
X-ray diffraction analysis revealed that they are remarkably isostructural
in showing a common [Co<sub>3</sub>Ln] core. Magnetic studies showed
that the Dy, Er, Tm, Yb, and Y complexes are ferromagnetic. The Dy
complex exhibits the largest magnetocaloric effect (−Δ<i>S</i><sub>m</sub> = 12.58 J kg<sup>–1</sup> K<sup>–1</sup>), which can be attributed to the large magnetic density of Dy<sup>III</sup>