Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes

We report the synthesis, structural characterization and a combined computational and experimental study of the magnetic properties of two pivalate cobalt complexes, a mononuclear Co(ii) one and a tetranuclear Co(ii) 3 Co(iii) mixed valence polynuclear one. The latter shows SMM behaviour revealed un...

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Publicado:	2018
Materias:	Electron spin resonance spectroscopy Magnetic susceptibility Magnetism Quantum chemistry Synthesis (chemical) Triethanolamine AC Magnetic susceptibility Anisotropic exchange interaction Cobalt complexes Magnetic behaviour Magnetization dynamics Quantum chemical computations Structural characterization Zero-field splittings Cobalt compounds
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14779226_v47_n47_p17055_Sarto http://hdl.handle.net/20.500.12110/paper_14779226_v47_n47_p17055_Sarto
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_14779226_v47_n47_p17055_Sarto
record_format	dspace
spelling	paper:paper_14779226_v47_n47_p17055_Sarto2023-06-08T16:18:18Z Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes Electron spin resonance spectroscopy Magnetic susceptibility Magnetism Quantum chemistry Synthesis (chemical) Triethanolamine AC Magnetic susceptibility Anisotropic exchange interaction Cobalt complexes Magnetic behaviour Magnetization dynamics Quantum chemical computations Structural characterization Zero-field splittings Cobalt compounds We report the synthesis, structural characterization and a combined computational and experimental study of the magnetic properties of two pivalate cobalt complexes, a mononuclear Co(ii) one and a tetranuclear Co(ii) 3 Co(iii) mixed valence polynuclear one. The latter shows SMM behaviour revealed under an applied DC field with a thermal barrier of ca. 30 cm -1 competing with direct and Raman relaxation processes. The Orbach thermal barrier can be understood from the doublets energy ladder arising from the anisotropic exchange interaction among ground S eff = 1/2 of each Co(ii) sites. The strong local zero-field splitting of the S = 3/2 Co(ii) states affords these well isolated ground Kramers doublets. DC and AC magnetic susceptibility measurements as well as HF-EPR spectra support this interpretation. CASSCF quantum chemical computations have been also performed in order to aid the overall comprehension of the magnetic behaviour in the reported complexes. © 2018 The Royal Society of Chemistry. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14779226_v47_n47_p17055_Sarto http://hdl.handle.net/20.500.12110/paper_14779226_v47_n47_p17055_Sarto
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Electron spin resonance spectroscopy Magnetic susceptibility Magnetism Quantum chemistry Synthesis (chemical) Triethanolamine AC Magnetic susceptibility Anisotropic exchange interaction Cobalt complexes Magnetic behaviour Magnetization dynamics Quantum chemical computations Structural characterization Zero-field splittings Cobalt compounds
spellingShingle	Electron spin resonance spectroscopy Magnetic susceptibility Magnetism Quantum chemistry Synthesis (chemical) Triethanolamine AC Magnetic susceptibility Anisotropic exchange interaction Cobalt complexes Magnetic behaviour Magnetization dynamics Quantum chemical computations Structural characterization Zero-field splittings Cobalt compounds Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes
topic_facet	Electron spin resonance spectroscopy Magnetic susceptibility Magnetism Quantum chemistry Synthesis (chemical) Triethanolamine AC Magnetic susceptibility Anisotropic exchange interaction Cobalt complexes Magnetic behaviour Magnetization dynamics Quantum chemical computations Structural characterization Zero-field splittings Cobalt compounds
description	We report the synthesis, structural characterization and a combined computational and experimental study of the magnetic properties of two pivalate cobalt complexes, a mononuclear Co(ii) one and a tetranuclear Co(ii) 3 Co(iii) mixed valence polynuclear one. The latter shows SMM behaviour revealed under an applied DC field with a thermal barrier of ca. 30 cm -1 competing with direct and Raman relaxation processes. The Orbach thermal barrier can be understood from the doublets energy ladder arising from the anisotropic exchange interaction among ground S eff = 1/2 of each Co(ii) sites. The strong local zero-field splitting of the S = 3/2 Co(ii) states affords these well isolated ground Kramers doublets. DC and AC magnetic susceptibility measurements as well as HF-EPR spectra support this interpretation. CASSCF quantum chemical computations have been also performed in order to aid the overall comprehension of the magnetic behaviour in the reported complexes. © 2018 The Royal Society of Chemistry.
title	Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes
title_short	Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes
title_full	Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes
title_fullStr	Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes
title_full_unstemmed	Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes
title_sort	slow magnetization dynamics in co(ii)/co(iii) triethanolamine/pivalate complexes
publishDate	2018
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14779226_v47_n47_p17055_Sarto http://hdl.handle.net/20.500.12110/paper_14779226_v47_n47_p17055_Sarto
_version_	1768545299057344512

Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes

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