Síntese, caracterização e propriedades magnéticas de complexos homo e heterobimetálicos com o ligante 2,2-difeniletil (oxamato)

• Autor(a) principal: Prado, Joice Ferreira do
• Data de Publicação: 2020
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/10640
• topic: Oxamato; Compostos de coordenação; Magnetos moleculares; Oxamate; Coordination compounds; Molecular magnets; CIENCIAS EXATAS E DA TERRA::QUIMICA

Initially, studies were carried out regarding the syntheses and characterizations of the oxamate ligand (EtH2dipea) and two new precursors [Me4N]2[Cu(dipea)2] and [Bu4N]2[Cu(dipea)2]. For preliminary studies, the synthesis and characterization of the lanthanide complexes (Dy, Eu, Gd, and Tb were also addressed. Taking as a starting element the precursor [Bu4N]2[Cu(dipea)2], were obtained from three new complexes heterobimetallics: {[CoCu(dipea)2]}n, {[NiCu(dipea)2]}n e {[MnCu(dipea)2]}n, which studies on the magnetic properties were carried out. These complexes exhibited ferromagnetic behavior with critical temperature 11.5 k for {[CoCu(dipea)2]}n, 3.92 k for {[NiCu(dipea)2]}n and 23.1 k for {[MnCu(dipea)2]}n. All the compounds obtained in this work were characterized by means of melting point, elemental analysis, vibrational spectroscopy in the infrared region and solubility. The EtH2dipea ligand was also characterized by nuclear magnetic resonance for hydrogen (RMN-1H) and carbon (RMN-13C) and mass spectrometry. For the precursors [Me4N]2[Cu(dipea)2] and [Bu4N]2[Cu(dipea)2]), thermal analysis was also used (TG and DTA) and monocrystal X-ray diffraction. For complexes with lanthanides [Me4N]3[Dy(dipea)3], [Me4N]3[Eu(dipea)3], [Me4N]3[Gd(dipea)3] and [Me4N]3[Tb(dipea)3] optical emission spectrometry with inductively coupled plasma, absorption spectroscopy in the ultraviolet and visible region and thermal analysis (TG and DTA) were also performed. And for the heterobimetallic complexes {[CoCu(dipea)2]}n, {[NiCu(dipea)2]}n e {[MnCu(dipea)2]}n atomic absorption spectrophotometry, absorption spectroscopy in the ultraviolet, visible and thermal analysis (TG and DTA) and powder X-ray diffraction