Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/25133
Type: Artigo de periódico
Title: Synthesis and Properties of New Molecule-Based Magnets Containing Mn(II), Cu(II) and Nitronyl Nitroxide Radical Cation
Author: Vaz, Maria G. F.
Knobel, Marcelo
Speziali, Nivaldo L.
Moreira, Alexandre M.
Alcântara, Antônio F. C.
Stumpf, Humberto O.
Abstract: In this work, we describe the synthesis of two new copper(II) compounds, (Pr-Rad)2 [Cu(opba)].H2O (1) and (Bu-Rad)2[Cu(opba)].2H2O (2) where opba stands for ortho-phenylenebis(oxamato) and RRad+ are nitronyl nitroxide radical cations. From 1 and 2, two new molecule-based magnets [Pr-Rad]2[Mn2{Cu(opba)}3 ].3.3DMSO.5H2O (3) and [Bu-Rad]2 [Mn2{Cu(opba)}3].3DMSO.6H 2O (4) were obtained, respectively. The magnetic properties of precursors 1 and 2 show the presence of ferromagnetic interaction between the radical cations with copper(II), in the temperature range of 20-300 K. The magnets 3 and 4 exhibit spontaneous magnetization at critical temperatures, Tc, of 23 K and 24 K, respectively.
Neste trabalho, descrevemos a obtenção de dois novos compostos de cobre(II), ou precursores, (Pr-Rad)2[Cu(opba)].H2O (1) e (Bu-Rad)2[Cu(opba)].2H2O (2), onde opba é o ligante orto-fenilenobis(oxamato) e R-Rad+ são radicais cátions do tipo nitronil nitróxido. A partir destes compostos 1 e 2, foram sintetizados os dois novos magnetos moleculares [Pr-Rad]2[Mn2{Cu(opba)}3 ].3,3 DMSO.5H2O (3) e [Bu-Rad]2[Mn2{Cu(opba)}3 ].3DMSO.6H2O (4), respectivamente. As propriedades magnéticas dos precursores 1 e 2 mostram a presença de interações ferromagnéticas entre os radicais cátions e o cobre (II), na faixa de temperatura entre 20 e 300 K. Os magnetos moleculares 3 e 4 exibem magnetização espontânea com temperatura crítica, Tc, de 23 K e 24 K, respectivamente.
Subject: supramolecular chemistry
molecule-based magnets
molecular materials
catenanes
ferrimagnetism
Editor: Sociedade Brasileira de Química
Rights: aberto
Identifier DOI: 10.1590/S0103-50532002000200009
Address: http://dx.doi.org/10.1590/S0103-50532002000200009
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000200009
Date Issue: 1-Jan-2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
S0103-50532002000200009.pdf217.51 kBAdobe PDFView/Open


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