Slow magnetic relaxation in mononuclear gadolinium(III) and dysprosium(III) oxamato complexes

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dc.creatorTamyris Teixeira da Cunha
dc.creatorVitor Magno Moreira Barbosa
dc.creatorWillian Xerxes Coelho Oliveira
dc.creatorCarlos Basílio Pinheiro
dc.creatorEmerson Fernandes Pedroso
dc.creatorWallace Castro Nunes
dc.creatorCynthia Lopes Martins Pereira
dc.date.accessioned2023-02-07T13:54:03Z
dc.date.accessioned2025-09-08T23:13:09Z
dc.date.available2023-02-07T13:54:03Z
dc.date.issued2019
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipOutra Agência
dc.identifier.doihttps://doi.org/10.1016/j.poly.2019.04.056
dc.identifier.issn1873-3719
dc.identifier.urihttps://hdl.handle.net/1843/49674
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.rightsAcesso Restrito
dc.subjectMetais de terras raras
dc.subjectCristalografia de raio X
dc.subjectMoléculas
dc.subjectMagnetismo
dc.subjectSíntese
dc.subjectPropriedades magnéticas
dc.subject.otherOxamate ligands
dc.subject.otherLanthanide complexes
dc.subject.otherCrystal structures
dc.subject.otherSlow magnetic relaxation
dc.subject.otherSingle-ion magnets
dc.titleSlow magnetic relaxation in mononuclear gadolinium(III) and dysprosium(III) oxamato complexes
dc.typeArtigo de periódico
local.citation.epage113
local.citation.spage102
local.citation.volume169
local.description.resumoA series of lanthanide(III) oxamate complexes of formula Na[Eu(4-HOpa)4(H2O)]∙2H2O (1), Na[Gd(4-HOpa)4(H2O)]∙2H2O (2), Na[Dy(4-HOpa)4(H2O)]∙2H2O (3), and Na[Ho(4-HOpa)4(H2O)]∙2H2O (4) (4-HOpa = N-4-hydroxyphenyloxamate) were synthesized and characterized. The crystal structures of complexes 1–4, as well as the oxamate ligand in the ethyl ester acid form (Et[4-HOpa]), were elucidated by single crystal X-ray diffraction. 1–4 are isostructural, and they crystallize in the P21/n space group of the monoclinic system. The crystal structures of 1–4 consist of mononuclear lanthanide(III) complex anions, [Ln(4-HOpa)4(H2O)]− (Ln = Eu³+, Gd³+, Dy³+, and Ho³+), coordinated sodium(I) countercations, and crystallization water molecules, resulting in a 2D NaILnIII supramolecular coordination network. The coordination sphere of Ln³+ ions consists of square-face capped square antiprism (SAPRS-9). Magnetic properties were investigated for 1–4 in the 2–300 K temperature range using polycrystalline samples. Complex 2 exhibits an unusual and rare slow-relaxation of the magnetization for Gd³+ ions under DC applied field of 1.0 kOe, behaving as a field-induced single-ion magnet as occurs for the Dy³+ complex 3. The Eu³+ complex 1 has a nonmagnetic ground state, while the Ho³+ compound 4 behave as a paramagnet, and do not exhibit relaxation of the magnetization with or without an applied field.
local.identifier.orcidhttps://orcid.org/0000-0002-3224-2624
local.identifier.orcidhttps://orcid.org/0000-0002-0222-6930
local.identifier.orcidhttps://orcid.org/0000-0003-0722-5352
local.identifier.orcidhttps://orcid.org/0000-0002-8674-1779
local.identifier.orcidhttps://orcid.org/0000-0001-8379-6638
local.identifier.orcidhttps://orcid.org/0000-0002-9908-2098
local.identifier.orcidhttps://orcid.org/0000-0002-3799-8092
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0277538719303031

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