Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes

Autores
Sartoris, Rosana Patricia; Calvo, Rafael; Santana, Ricardo; Nascimento, Otaciro R.; Perec, Mireille; Baggio, Ricardo Fortunato
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Two new pyrophosphate-bridged copperII complexes, [Cu(dpa)(H2O7P2)]21 and [Cu2(terpy)2(HO7P2)·(H2O4P)·(H3O4P)·(H2O)] 2 (dpa = 2,2′-dipyridylamine and terpy = 2,2′:6′,2″-terpyridine) were isolated and their crystal structures determined by single-crystal X-ray diffraction. The compounds are triclinic and contain dinuclear copperII units bridged by pyrophosphate anions. The EPR spectra observed in three planes of single crystal samples as a function of field orientation at 293 K for compounds 1 and 2, and also for two other pyrophosphate compounds already reported, [Cu(bipy)(cis-H2O7P2)]2·3(H2O) 3 and [Cu(bipy)(trans-H2P2O7)]24 display a single resonance for any field orientation and temperatures T between 4 and 293 K, as in mononuclear spin systems, without hyperfine structure, and their g-factors and line widths were measured. The relations between the principal directions of the g-matrices and the molecular structures are discussed and compared with related compounds. The temperature dependences of the intensity of the EPR signals observed for 1–4 above 4 K indicate a paramagnetic Curie behavior, with no indication of intradinuclear exchange interactions (so, |J| < 2 K). The absence of dinuclear splitting and of hyperfine structure of the dinuclear units is explained in terms of averaging out by the interdinuclear interactions, allowing to set a lower limit of their magnitudes.
Fil: Sartoris, Rosana Patricia. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Física del Litoral; Argentina
Fil: Calvo, Rafael. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Física del Litoral; Argentina
Fil: Santana, Ricardo. Universidade Federal de Goias; Brasil
Fil: Nascimento, Otaciro R.. Universidade de São Paulo. Instituto de Física de São Carlos. Departamento de Física e Informática. Grupo de Biofísica Molecular Sergio Mascarenhas; Brasil
Fil: Perec, Mireille. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina
Fil: Baggio, Ricardo Fortunato. Comisión Nacional de Energía Atómica; Argentina
Materia
Copper
Pyrophosphates
Structure
Magnetic Interactions
Epr
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/4401
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/4401
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII ComplexesSartoris, Rosana PatriciaCalvo, RafaelSantana, RicardoNascimento, Otaciro R.Perec, MireilleBaggio, Ricardo FortunatoCopperPyrophosphatesStructureMagnetic InteractionsEprhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Two new pyrophosphate-bridged copperII complexes, [Cu(dpa)(H2O7P2)]21 and [Cu2(terpy)2(HO7P2)·(H2O4P)·(H3O4P)·(H2O)] 2 (dpa = 2,2′-dipyridylamine and terpy = 2,2′:6′,2″-terpyridine) were isolated and their crystal structures determined by single-crystal X-ray diffraction. The compounds are triclinic and contain dinuclear copperII units bridged by pyrophosphate anions. The EPR spectra observed in three planes of single crystal samples as a function of field orientation at 293 K for compounds 1 and 2, and also for two other pyrophosphate compounds already reported, [Cu(bipy)(cis-H2O7P2)]2·3(H2O) 3 and [Cu(bipy)(trans-H2P2O7)]24 display a single resonance for any field orientation and temperatures T between 4 and 293 K, as in mononuclear spin systems, without hyperfine structure, and their g-factors and line widths were measured. The relations between the principal directions of the g-matrices and the molecular structures are discussed and compared with related compounds. The temperature dependences of the intensity of the EPR signals observed for 1–4 above 4 K indicate a paramagnetic Curie behavior, with no indication of intradinuclear exchange interactions (so, |J| < 2 K). The absence of dinuclear splitting and of hyperfine structure of the dinuclear units is explained in terms of averaging out by the interdinuclear interactions, allowing to set a lower limit of their magnitudes.Fil: Sartoris, Rosana Patricia. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Física del Litoral; ArgentinaFil: Calvo, Rafael. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Física del Litoral; ArgentinaFil: Santana, Ricardo. Universidade Federal de Goias; BrasilFil: Nascimento, Otaciro R.. Universidade de São Paulo. Instituto de Física de São Carlos. Departamento de Física e Informática. Grupo de Biofísica Molecular Sergio Mascarenhas; BrasilFil: Perec, Mireille. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía; ArgentinaFil: Baggio, Ricardo Fortunato. Comisión Nacional de Energía Atómica; ArgentinaElsevier2014-05-15info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/4401Sartoris, Rosana Patricia; Calvo, Rafael; Santana, Ricardo; Nascimento, Otaciro R.; Perec, Mireille; et al.; Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes; Elsevier; Polyhedron; 79; 15-5-2014; 178-1850277-5387enginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0277538714002988info:eu-repo/semantics/altIdentifier/doi/10.1016/j.poly.2014.05.002info:eu-repo/semantics/altIdentifier/issn/0277-5387info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:49:05Zoai:ri.conicet.gov.ar:11336/4401instacron: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:34982025-09-03 09:49:05.533CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes
title Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes
spellingShingle Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes
Sartoris, Rosana Patricia
Copper
Pyrophosphates
Structure
Magnetic Interactions
Epr
title_short Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes
title_full Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes
title_fullStr Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes
title_full_unstemmed Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes
title_sort Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes
dc.creator.none.fl_str_mv Sartoris, Rosana Patricia
Calvo, Rafael
Santana, Ricardo
Nascimento, Otaciro R.
Perec, Mireille
Baggio, Ricardo Fortunato
author Sartoris, Rosana Patricia
author_facet Sartoris, Rosana Patricia
Calvo, Rafael
Santana, Ricardo
Nascimento, Otaciro R.
Perec, Mireille
Baggio, Ricardo Fortunato
author_role author
author2 Calvo, Rafael
Santana, Ricardo
Nascimento, Otaciro R.
Perec, Mireille
Baggio, Ricardo Fortunato
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Copper
Pyrophosphates
Structure
Magnetic Interactions
Epr
topic Copper
Pyrophosphates
Structure
Magnetic Interactions
Epr
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Two new pyrophosphate-bridged copperII complexes, [Cu(dpa)(H2O7P2)]21 and [Cu2(terpy)2(HO7P2)·(H2O4P)·(H3O4P)·(H2O)] 2 (dpa = 2,2′-dipyridylamine and terpy = 2,2′:6′,2″-terpyridine) were isolated and their crystal structures determined by single-crystal X-ray diffraction. The compounds are triclinic and contain dinuclear copperII units bridged by pyrophosphate anions. The EPR spectra observed in three planes of single crystal samples as a function of field orientation at 293 K for compounds 1 and 2, and also for two other pyrophosphate compounds already reported, [Cu(bipy)(cis-H2O7P2)]2·3(H2O) 3 and [Cu(bipy)(trans-H2P2O7)]24 display a single resonance for any field orientation and temperatures T between 4 and 293 K, as in mononuclear spin systems, without hyperfine structure, and their g-factors and line widths were measured. The relations between the principal directions of the g-matrices and the molecular structures are discussed and compared with related compounds. The temperature dependences of the intensity of the EPR signals observed for 1–4 above 4 K indicate a paramagnetic Curie behavior, with no indication of intradinuclear exchange interactions (so, |J| < 2 K). The absence of dinuclear splitting and of hyperfine structure of the dinuclear units is explained in terms of averaging out by the interdinuclear interactions, allowing to set a lower limit of their magnitudes.
Fil: Sartoris, Rosana Patricia. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Física del Litoral; Argentina
Fil: Calvo, Rafael. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Física del Litoral; Argentina
Fil: Santana, Ricardo. Universidade Federal de Goias; Brasil
Fil: Nascimento, Otaciro R.. Universidade de São Paulo. Instituto de Física de São Carlos. Departamento de Física e Informática. Grupo de Biofísica Molecular Sergio Mascarenhas; Brasil
Fil: Perec, Mireille. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina
Fil: Baggio, Ricardo Fortunato. Comisión Nacional de Energía Atómica; Argentina
description Two new pyrophosphate-bridged copperII complexes, [Cu(dpa)(H2O7P2)]21 and [Cu2(terpy)2(HO7P2)·(H2O4P)·(H3O4P)·(H2O)] 2 (dpa = 2,2′-dipyridylamine and terpy = 2,2′:6′,2″-terpyridine) were isolated and their crystal structures determined by single-crystal X-ray diffraction. The compounds are triclinic and contain dinuclear copperII units bridged by pyrophosphate anions. The EPR spectra observed in three planes of single crystal samples as a function of field orientation at 293 K for compounds 1 and 2, and also for two other pyrophosphate compounds already reported, [Cu(bipy)(cis-H2O7P2)]2·3(H2O) 3 and [Cu(bipy)(trans-H2P2O7)]24 display a single resonance for any field orientation and temperatures T between 4 and 293 K, as in mononuclear spin systems, without hyperfine structure, and their g-factors and line widths were measured. The relations between the principal directions of the g-matrices and the molecular structures are discussed and compared with related compounds. The temperature dependences of the intensity of the EPR signals observed for 1–4 above 4 K indicate a paramagnetic Curie behavior, with no indication of intradinuclear exchange interactions (so, |J| < 2 K). The absence of dinuclear splitting and of hyperfine structure of the dinuclear units is explained in terms of averaging out by the interdinuclear interactions, allowing to set a lower limit of their magnitudes.
publishDate 2014
dc.date.none.fl_str_mv 2014-05-15
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
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/4401
Sartoris, Rosana Patricia; Calvo, Rafael; Santana, Ricardo; Nascimento, Otaciro R.; Perec, Mireille; et al.; Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes; Elsevier; Polyhedron; 79; 15-5-2014; 178-185
0277-5387
url http://hdl.handle.net/11336/4401
identifier_str_mv Sartoris, Rosana Patricia; Calvo, Rafael; Santana, Ricardo; Nascimento, Otaciro R.; Perec, Mireille; et al.; Structural and EPR Studies of Pyrophosphate-Bridged Dinuclear CuII Complexes; Elsevier; Polyhedron; 79; 15-5-2014; 178-185
0277-5387
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0277538714002988
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.poly.2014.05.002
info:eu-repo/semantics/altIdentifier/issn/0277-5387
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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