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Title: A Pseudo-Octahedral Cobalt(II) Complex with Bispyrazolylpyridine Ligands Acting as a Zero-Field Single-Molecule Magnet with Easy Axis Anisotropy
Author: Rigamonti, Luca
Bridonneau, Nathalie
Poneti, Giordano
Tesi, Lorenzo
Sorace, Lorenzo
Pinkowicz, Dawid
Jover Modrego, Jesús
Ruiz Sabín, Eliseo
Sessoli, Roberta
Cornia, Andrea
Keywords: Anisotropia
Lligands (Bioquímica)
Propietats magnètiques
Ligands (Biochemistry)
Magnetic properties
Issue Date: 21-Jun-2018
Publisher: Wiley-VCH
Abstract: The homoleptic mononuclear compound [Co(bpp‐COOMe)2](ClO4)2 (1) (bpp‐COOMe=methyl 2,6‐di(pyrazol‐1‐yl)pyridine‐4‐carboxylate) crystallizes in the monoclinic C2/c space group, and the cobalt(II) ion possesses a pseudo‐octahedral environment given by the two mer‐coordinated tridentate ligands. Direct‐current magnetic data, single‐crystal torque magnetometry, and EPR measurements disclosed the easy‐axis nature of this cobalt(II) complex, which shows single‐molecule magnet behavior when a static field is applied in alternating‐current susceptibility measurements. Diamagnetic dilution in the zinc(II) analogue [Zn(bpp‐COOMe)2](ClO4)2 (2) afforded the derivative [Zn0.95Co0.05(bpp‐COOMe)2](ClO4)2 (3), which exhibits slow relaxation of magnetization even in zero field thanks to the reduction of dipolar interactions. Theoretical calculations confirmed the overall electronic structure and the magnetic scenario of the compound as drawn by experimental data, thus confirming the spin‐phonon Raman relaxation mechanism, and a direct quantum tunneling in the ground state as the most plausible relaxation pathway in zero field.
Note: Versió postprint del document publicat a:
It is part of: Chemistry-A European Journal, 2018, vol. 24, num. 35, p. 8857-8868
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ISSN: 0947-6539
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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