Slow relaxation of the magnetization in Oximato-bridged heterobimetallic Copper(II)-Manganese(III) chains
Autor(a) principal: | |
---|---|
Data de Publicação: | 2011 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Chemical Society (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532011000500023 |
Resumo: | The use of the oximato-containing copper(II) complexes, [Cu(Hdeg)2] (H2deg = diethylglyoxime), [Cu(Hmeg)2] (H2meg = methylethylglyoxime) and [Cu(Hdmg)2] (H2dmg = dimethylglyoxime), as ligands toward manganese(II) acetate in methanol afforded the heterobimetallic compounds of formula [MnCu(deg)2(CH3COO)(H2O)2] (1), [MnCu(meg)2(CH3COO)(H2O)2] (2) and [MnCu(dmg)2(CH3COO)(H2O)2] (3) where the starting manganese(II) ion was oxidized to manganese(III) by air. In the lack of single crystals suitable for X-ray diffraction analysis, X-ray absorption techniques (EXAFS and XANES) at 40 K were used for the structural characterization of 1-3. The analysis of the X-ray absorption data reveals that 1-3 are oximato-bridged CuII-MnIII bimetallic chains with elongated octahedral CuN4O2 and MnO6 surroundings. The study of the magnetic properties of 1-3 reveals a metamagnetic-like behavior due to the coexistence of strong intrachain ferromagnetic couplings [J = +52.5 (1), +49.1 (2) and +52.1 cm-1 (3)] and weak interchain antiferromagnetic interactions [j = -0.070 (1), -0.075 (2) and -0.078 cm-1 (3)]. The strict orthogonality between the magnetic orbital of the copper(II) ion and those of the manganese(III) center, together with the well known ability of the oximato group to mediate magnetic interactions when acting as a bridge between two metal ions, account for the relatively strong intrachain ferromagnetic coupling in 1-3. Alternating current susceptibility measurements for 1-3 in the low temperature range under zero dc magnetic field reveal a frequency-dependence of the out-of-phase ac signal as expected for single chain magnets |
id |
SBQ-2_994b9cafe27b537f3689cd62098be09e |
---|---|
oai_identifier_str |
oai:scielo:S0103-50532011000500023 |
network_acronym_str |
SBQ-2 |
network_name_str |
Journal of the Brazilian Chemical Society (Online) |
repository_id_str |
|
spelling |
Slow relaxation of the magnetization in Oximato-bridged heterobimetallic Copper(II)-Manganese(III) chainsmetal oximatesheterobimetallic complexescomplex as ligand strategyexchange couplingsingle chain magnetsThe use of the oximato-containing copper(II) complexes, [Cu(Hdeg)2] (H2deg = diethylglyoxime), [Cu(Hmeg)2] (H2meg = methylethylglyoxime) and [Cu(Hdmg)2] (H2dmg = dimethylglyoxime), as ligands toward manganese(II) acetate in methanol afforded the heterobimetallic compounds of formula [MnCu(deg)2(CH3COO)(H2O)2] (1), [MnCu(meg)2(CH3COO)(H2O)2] (2) and [MnCu(dmg)2(CH3COO)(H2O)2] (3) where the starting manganese(II) ion was oxidized to manganese(III) by air. In the lack of single crystals suitable for X-ray diffraction analysis, X-ray absorption techniques (EXAFS and XANES) at 40 K were used for the structural characterization of 1-3. The analysis of the X-ray absorption data reveals that 1-3 are oximato-bridged CuII-MnIII bimetallic chains with elongated octahedral CuN4O2 and MnO6 surroundings. The study of the magnetic properties of 1-3 reveals a metamagnetic-like behavior due to the coexistence of strong intrachain ferromagnetic couplings [J = +52.5 (1), +49.1 (2) and +52.1 cm-1 (3)] and weak interchain antiferromagnetic interactions [j = -0.070 (1), -0.075 (2) and -0.078 cm-1 (3)]. The strict orthogonality between the magnetic orbital of the copper(II) ion and those of the manganese(III) center, together with the well known ability of the oximato group to mediate magnetic interactions when acting as a bridge between two metal ions, account for the relatively strong intrachain ferromagnetic coupling in 1-3. Alternating current susceptibility measurements for 1-3 in the low temperature range under zero dc magnetic field reveal a frequency-dependence of the out-of-phase ac signal as expected for single chain magnetsSociedade Brasileira de Química2011-05-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532011000500023Journal of the Brazilian Chemical Society v.22 n.5 2011reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532011000500023info:eu-repo/semantics/openAccessRuiz,RafaelCastro,IsabelPardo,EmilioFerrando-Soria,JesúsCano,JoanLloret,FrancescJulve,Migueleng2011-05-16T00:00:00Zoai:scielo:S0103-50532011000500023Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2011-05-16T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Slow relaxation of the magnetization in Oximato-bridged heterobimetallic Copper(II)-Manganese(III) chains |
title |
Slow relaxation of the magnetization in Oximato-bridged heterobimetallic Copper(II)-Manganese(III) chains |
spellingShingle |
Slow relaxation of the magnetization in Oximato-bridged heterobimetallic Copper(II)-Manganese(III) chains Ruiz,Rafael metal oximates heterobimetallic complexes complex as ligand strategy exchange coupling single chain magnets |
title_short |
Slow relaxation of the magnetization in Oximato-bridged heterobimetallic Copper(II)-Manganese(III) chains |
title_full |
Slow relaxation of the magnetization in Oximato-bridged heterobimetallic Copper(II)-Manganese(III) chains |
title_fullStr |
Slow relaxation of the magnetization in Oximato-bridged heterobimetallic Copper(II)-Manganese(III) chains |
title_full_unstemmed |
Slow relaxation of the magnetization in Oximato-bridged heterobimetallic Copper(II)-Manganese(III) chains |
title_sort |
Slow relaxation of the magnetization in Oximato-bridged heterobimetallic Copper(II)-Manganese(III) chains |
author |
Ruiz,Rafael |
author_facet |
Ruiz,Rafael Castro,Isabel Pardo,Emilio Ferrando-Soria,Jesús Cano,Joan Lloret,Francesc Julve,Miguel |
author_role |
author |
author2 |
Castro,Isabel Pardo,Emilio Ferrando-Soria,Jesús Cano,Joan Lloret,Francesc Julve,Miguel |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Ruiz,Rafael Castro,Isabel Pardo,Emilio Ferrando-Soria,Jesús Cano,Joan Lloret,Francesc Julve,Miguel |
dc.subject.por.fl_str_mv |
metal oximates heterobimetallic complexes complex as ligand strategy exchange coupling single chain magnets |
topic |
metal oximates heterobimetallic complexes complex as ligand strategy exchange coupling single chain magnets |
description |
The use of the oximato-containing copper(II) complexes, [Cu(Hdeg)2] (H2deg = diethylglyoxime), [Cu(Hmeg)2] (H2meg = methylethylglyoxime) and [Cu(Hdmg)2] (H2dmg = dimethylglyoxime), as ligands toward manganese(II) acetate in methanol afforded the heterobimetallic compounds of formula [MnCu(deg)2(CH3COO)(H2O)2] (1), [MnCu(meg)2(CH3COO)(H2O)2] (2) and [MnCu(dmg)2(CH3COO)(H2O)2] (3) where the starting manganese(II) ion was oxidized to manganese(III) by air. In the lack of single crystals suitable for X-ray diffraction analysis, X-ray absorption techniques (EXAFS and XANES) at 40 K were used for the structural characterization of 1-3. The analysis of the X-ray absorption data reveals that 1-3 are oximato-bridged CuII-MnIII bimetallic chains with elongated octahedral CuN4O2 and MnO6 surroundings. The study of the magnetic properties of 1-3 reveals a metamagnetic-like behavior due to the coexistence of strong intrachain ferromagnetic couplings [J = +52.5 (1), +49.1 (2) and +52.1 cm-1 (3)] and weak interchain antiferromagnetic interactions [j = -0.070 (1), -0.075 (2) and -0.078 cm-1 (3)]. The strict orthogonality between the magnetic orbital of the copper(II) ion and those of the manganese(III) center, together with the well known ability of the oximato group to mediate magnetic interactions when acting as a bridge between two metal ions, account for the relatively strong intrachain ferromagnetic coupling in 1-3. Alternating current susceptibility measurements for 1-3 in the low temperature range under zero dc magnetic field reveal a frequency-dependence of the out-of-phase ac signal as expected for single chain magnets |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-05-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532011000500023 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532011000500023 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50532011000500023 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
dc.source.none.fl_str_mv |
Journal of the Brazilian Chemical Society v.22 n.5 2011 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Journal of the Brazilian Chemical Society (Online) |
collection |
Journal of the Brazilian Chemical Society (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
||office@jbcs.sbq.org.br |
_version_ |
1750318172272066560 |