1. Repositório Institucional da UFMG
2. Publicações Científicas e Culturais
3. Artigo de Periódico

Type:	Artigo de Periódico
Title:	Slow magnetic relaxation in mononuclear gadolinium(III) and dysprosium(III) oxamato complexes
Authors:	Tamyris Teixeira da Cunha Vitor Magno Moreira Barbosa Willian Xerxes Coelho Oliveira Carlos Basílio Pinheiro Emerson Fernandes Pedroso Wallace Castro Nunes Cynthia Lopes Martins Pereira
Abstract:	A 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.
Subject:	Metais de terras raras Cristalografia de raio X Moléculas Magnetismo Síntese Propriedades magnéticas
language:	eng
metadata.dc.publisher.country:	Brasil
Publisher:	Universidade Federal de Minas Gerais
Publisher Initials:	UFMG
metadata.dc.publisher.department:	ICX - DEPARTAMENTO DE FÍSICA ICX - DEPARTAMENTO DE QUÍMICA
Rights:	Acesso Restrito
metadata.dc.identifier.doi:	https://doi.org/10.1016/j.poly.2019.04.056
URI:	http://hdl.handle.net/1843/49674
Issue Date:	2019
metadata.dc.url.externa:	https://www.sciencedirect.com/science/article/pii/S0277538719303031
Appears in Collections:	Artigo de Periódico

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.