Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O
- Autores
- Gerard, Matias Fernando; Aiassa, C.; Casado, Nieves Maria Claudia; Santana, R. C.; Perec, Mireille; Rapp, R. E.; Calvo, Rafael
- Año de publicación
- 2007
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Magnetic and EPR data have been collected for complex [Cu(L-Arg)2](NO3)2-3H2O (Arg ¼ arginine). Magnetic susceptibility w in the temperature range 2–160 K, and a magnetization isotherm at T ¼ 2.29(1)K with magnetic fields between 0 and 9 T were measured. The observed variation of wT with T indicates predominant antiferromagnetic interactions between Cu(II) ions coupled in 1D chains along the b axis. Fitting a molecular field model to the susceptibility data allows to evaluate g ¼ 2.10(1) for the average g-factor and J ¼ -0.42(6) cm-1 for the nearest neighbor exchange coupling (defined as Hex ¼ -PJijSi- Sj). This coupling is assigned to syn–anti equatorial–apical carboxylate bridges connecting Cu(II) ion neighbors at 5.682A ° , with a total bond length of 6.989A ° and is consistent with the magnetization isotherm results. It is discussed and compared with couplings observed in other compounds with similar exchange bridges. EPR spectra at 9.77 were obtained in powder samples and at 9.77 and at 34.1GHz in the three orthogonal planes of single crystals. At both microwave frequencies, and for all magnetic field orientations a single signal arising from the collapse due to exchange interaction of resonances corresponding to two rotated Cu(II) sites is observed. From the EPR results the molecular g-tensors corresponding to the two copper sites in the unit cell were evaluated, allowing an estimated lower limit |J |40.1 cm-1 for the exchange interaction between Cu(II) neighbors, consistent with the magnetic measurements.
Fil: Gerard, Matias Fernando. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
Fil: Aiassa, C.. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina
Fil: Casado, Nieves Maria Claudia. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina
Fil: Santana, R. C.. Universidade Federal de Goiás; Brasil
Fil: Perec, Mireille. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Rapp, R. E.. Universidade Federal do Rio de Janeiro; Brasil
Fil: Calvo, Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina - Materia
-
Magnetic Properties
Electron Paramagnetic Resonance - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/22819
Ver los metadatos del registro completo
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Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2OGerard, Matias FernandoAiassa, C.Casado, Nieves Maria ClaudiaSantana, R. C.Perec, MireilleRapp, R. E.Calvo, RafaelMagnetic PropertiesElectron Paramagnetic Resonancehttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Magnetic and EPR data have been collected for complex [Cu(L-Arg)2](NO3)2-3H2O (Arg ¼ arginine). Magnetic susceptibility w in the temperature range 2–160 K, and a magnetization isotherm at T ¼ 2.29(1)K with magnetic fields between 0 and 9 T were measured. The observed variation of wT with T indicates predominant antiferromagnetic interactions between Cu(II) ions coupled in 1D chains along the b axis. Fitting a molecular field model to the susceptibility data allows to evaluate g ¼ 2.10(1) for the average g-factor and J ¼ -0.42(6) cm-1 for the nearest neighbor exchange coupling (defined as Hex ¼ -PJijSi- Sj). This coupling is assigned to syn–anti equatorial–apical carboxylate bridges connecting Cu(II) ion neighbors at 5.682A ° , with a total bond length of 6.989A ° and is consistent with the magnetization isotherm results. It is discussed and compared with couplings observed in other compounds with similar exchange bridges. EPR spectra at 9.77 were obtained in powder samples and at 9.77 and at 34.1GHz in the three orthogonal planes of single crystals. At both microwave frequencies, and for all magnetic field orientations a single signal arising from the collapse due to exchange interaction of resonances corresponding to two rotated Cu(II) sites is observed. From the EPR results the molecular g-tensors corresponding to the two copper sites in the unit cell were evaluated, allowing an estimated lower limit |J |40.1 cm-1 for the exchange interaction between Cu(II) neighbors, consistent with the magnetic measurements.Fil: Gerard, Matias Fernando. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Aiassa, C.. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; ArgentinaFil: Casado, Nieves Maria Claudia. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; ArgentinaFil: Santana, R. C.. Universidade Federal de Goiás; BrasilFil: Perec, Mireille. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Rapp, R. E.. Universidade Federal do Rio de Janeiro; BrasilFil: Calvo, Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaElsevier2007-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/22819Gerard, Matias Fernando; Aiassa, C.; Casado, Nieves Maria Claudia; Santana, R. C.; Perec, Mireille; et al.; Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O; Elsevier; Journal of Physics and Chemistry of Solids; 68; 8; 6-2007; 1533-15390022-3697CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.jpcs.2007.03.032info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0022369707001564info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:05:26Zoai:ri.conicet.gov.ar:11336/22819instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:05:27.093CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O |
| title |
Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O |
| spellingShingle |
Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O Gerard, Matias Fernando Magnetic Properties Electron Paramagnetic Resonance |
| title_short |
Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O |
| title_full |
Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O |
| title_fullStr |
Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O |
| title_full_unstemmed |
Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O |
| title_sort |
Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O |
| dc.creator.none.fl_str_mv |
Gerard, Matias Fernando Aiassa, C. Casado, Nieves Maria Claudia Santana, R. C. Perec, Mireille Rapp, R. E. Calvo, Rafael |
| author |
Gerard, Matias Fernando |
| author_facet |
Gerard, Matias Fernando Aiassa, C. Casado, Nieves Maria Claudia Santana, R. C. Perec, Mireille Rapp, R. E. Calvo, Rafael |
| author_role |
author |
| author2 |
Aiassa, C. Casado, Nieves Maria Claudia Santana, R. C. Perec, Mireille Rapp, R. E. Calvo, Rafael |
| author2_role |
author author author author author author |
| dc.subject.none.fl_str_mv |
Magnetic Properties Electron Paramagnetic Resonance |
| topic |
Magnetic Properties Electron Paramagnetic Resonance |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| dc.description.none.fl_txt_mv |
Magnetic and EPR data have been collected for complex [Cu(L-Arg)2](NO3)2-3H2O (Arg ¼ arginine). Magnetic susceptibility w in the temperature range 2–160 K, and a magnetization isotherm at T ¼ 2.29(1)K with magnetic fields between 0 and 9 T were measured. The observed variation of wT with T indicates predominant antiferromagnetic interactions between Cu(II) ions coupled in 1D chains along the b axis. Fitting a molecular field model to the susceptibility data allows to evaluate g ¼ 2.10(1) for the average g-factor and J ¼ -0.42(6) cm-1 for the nearest neighbor exchange coupling (defined as Hex ¼ -PJijSi- Sj). This coupling is assigned to syn–anti equatorial–apical carboxylate bridges connecting Cu(II) ion neighbors at 5.682A ° , with a total bond length of 6.989A ° and is consistent with the magnetization isotherm results. It is discussed and compared with couplings observed in other compounds with similar exchange bridges. EPR spectra at 9.77 were obtained in powder samples and at 9.77 and at 34.1GHz in the three orthogonal planes of single crystals. At both microwave frequencies, and for all magnetic field orientations a single signal arising from the collapse due to exchange interaction of resonances corresponding to two rotated Cu(II) sites is observed. From the EPR results the molecular g-tensors corresponding to the two copper sites in the unit cell were evaluated, allowing an estimated lower limit |J |40.1 cm-1 for the exchange interaction between Cu(II) neighbors, consistent with the magnetic measurements. Fil: Gerard, Matias Fernando. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina Fil: Aiassa, C.. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina Fil: Casado, Nieves Maria Claudia. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina Fil: Santana, R. C.. Universidade Federal de Goiás; Brasil Fil: Perec, Mireille. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Rapp, R. E.. Universidade Federal do Rio de Janeiro; Brasil Fil: Calvo, Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina |
| description |
Magnetic and EPR data have been collected for complex [Cu(L-Arg)2](NO3)2-3H2O (Arg ¼ arginine). Magnetic susceptibility w in the temperature range 2–160 K, and a magnetization isotherm at T ¼ 2.29(1)K with magnetic fields between 0 and 9 T were measured. The observed variation of wT with T indicates predominant antiferromagnetic interactions between Cu(II) ions coupled in 1D chains along the b axis. Fitting a molecular field model to the susceptibility data allows to evaluate g ¼ 2.10(1) for the average g-factor and J ¼ -0.42(6) cm-1 for the nearest neighbor exchange coupling (defined as Hex ¼ -PJijSi- Sj). This coupling is assigned to syn–anti equatorial–apical carboxylate bridges connecting Cu(II) ion neighbors at 5.682A ° , with a total bond length of 6.989A ° and is consistent with the magnetization isotherm results. It is discussed and compared with couplings observed in other compounds with similar exchange bridges. EPR spectra at 9.77 were obtained in powder samples and at 9.77 and at 34.1GHz in the three orthogonal planes of single crystals. At both microwave frequencies, and for all magnetic field orientations a single signal arising from the collapse due to exchange interaction of resonances corresponding to two rotated Cu(II) sites is observed. From the EPR results the molecular g-tensors corresponding to the two copper sites in the unit cell were evaluated, allowing an estimated lower limit |J |40.1 cm-1 for the exchange interaction between Cu(II) neighbors, consistent with the magnetic measurements. |
| publishDate |
2007 |
| dc.date.none.fl_str_mv |
2007-06 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://hdl.handle.net/11336/22819 Gerard, Matias Fernando; Aiassa, C.; Casado, Nieves Maria Claudia; Santana, R. C.; Perec, Mireille; et al.; Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O; Elsevier; Journal of Physics and Chemistry of Solids; 68; 8; 6-2007; 1533-1539 0022-3697 CONICET Digital CONICET |
| url |
http://hdl.handle.net/11336/22819 |
| identifier_str_mv |
Gerard, Matias Fernando; Aiassa, C.; Casado, Nieves Maria Claudia; Santana, R. C.; Perec, Mireille; et al.; Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O; Elsevier; Journal of Physics and Chemistry of Solids; 68; 8; 6-2007; 1533-1539 0022-3697 CONICET Digital CONICET |
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eng |
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eng |
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jpcs.2007.03.032 info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0022369707001564 |
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Elsevier |
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Elsevier |
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