Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes

Autores
Ferrari, Gabriela Verónica; Pappano, Nora Beatriz; Debattista, Nora Beatriz; Montaña, Maria Paulina
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Flavonoids are a large family of natural compounds that includes flavones, flavonols, and chalcones, among others. These compounds are investigated due to their varied biological properties and their capacity to complex metal ions. In this work, the complexation of four 3-hydroxyflavones with the lanthanum(III) ion was studied. A series of novel complexes of La(III) with the selected 3-hydroxyflavones, 3,7-dihydroxyflavone (L1), 3,7,3′- trihydroxyflavone (L2), 3,5,7,3′,4′-pentahydroxyflavone (quercetin) (L3), and 3,5,7,2′,4′-pentahydroxyflavone (morin) (L4), were studied by means of Potentiometric and spectrophotometric methods at 26.3 °C and 0.1 M ionic strength in a water-dioxan (1:1, v/v) medium. Their formation constants were evaluated by the Calvin-Bjerrum and Irving-Rossotti methods. Complex 1:1 was found for all four ligands, whereas the 2:1 ligand-metal stoichiometry was found for only three of the four ligands. The obtained protonation constants of the ligands were: L 1, log K1H = 9.128 ±0.664; L 2, log K1H = 11.091 ± 0.134, log K 2H = 8.822 ± 5·10-4; L 3, log K2H = 9.310 ±0.119, log K 2H = 8.382 ± 0.109; L4, log K 1H = 10.021 ± 0.355, log K2H = 7.173 ± 0.576. The determined stability constants were: L 1-La(III), log K1 = 7.269 ± 0.387; L 2-La(III), log K1 = 9.164 ± 0.020, log K 2 = 5.200 ± 0.185; L3-La(III), log K1 = 8.143 ± 0.284, log K2 = 5.632 ± 0.585; L 4-La(III), log K1 = 7.407 ± 0.596, log K 2 = 4.830 ± 0.165.
Fil: Ferrari, Gabriela Verónica. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Química de San Luis. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Química de San Luis; Argentina
Fil: Pappano, Nora Beatriz. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; Argentina
Fil: Debattista, Nora Beatriz. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; Argentina
Fil: Montaña, Maria Paulina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Química de San Luis. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Química de San Luis; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; Argentina
Materia
FLAVONOIDS
LANTHANUM
POTENTIOMETRIC
STABILITY CONSTANT
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/93012
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/93012
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexesFerrari, Gabriela VerónicaPappano, Nora BeatrizDebattista, Nora BeatrizMontaña, Maria PaulinaFLAVONOIDSLANTHANUMPOTENTIOMETRICSTABILITY CONSTANThttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Flavonoids are a large family of natural compounds that includes flavones, flavonols, and chalcones, among others. These compounds are investigated due to their varied biological properties and their capacity to complex metal ions. In this work, the complexation of four 3-hydroxyflavones with the lanthanum(III) ion was studied. A series of novel complexes of La(III) with the selected 3-hydroxyflavones, 3,7-dihydroxyflavone (L1), 3,7,3′- trihydroxyflavone (L2), 3,5,7,3′,4′-pentahydroxyflavone (quercetin) (L3), and 3,5,7,2′,4′-pentahydroxyflavone (morin) (L4), were studied by means of Potentiometric and spectrophotometric methods at 26.3 °C and 0.1 M ionic strength in a water-dioxan (1:1, v/v) medium. Their formation constants were evaluated by the Calvin-Bjerrum and Irving-Rossotti methods. Complex 1:1 was found for all four ligands, whereas the 2:1 ligand-metal stoichiometry was found for only three of the four ligands. The obtained protonation constants of the ligands were: L 1, log K1H = 9.128 ±0.664; L 2, log K1H = 11.091 ± 0.134, log K 2H = 8.822 ± 5·10-4; L 3, log K2H = 9.310 ±0.119, log K 2H = 8.382 ± 0.109; L4, log K 1H = 10.021 ± 0.355, log K2H = 7.173 ± 0.576. The determined stability constants were: L 1-La(III), log K1 = 7.269 ± 0.387; L 2-La(III), log K1 = 9.164 ± 0.020, log K 2 = 5.200 ± 0.185; L3-La(III), log K1 = 8.143 ± 0.284, log K2 = 5.632 ± 0.585; L 4-La(III), log K1 = 7.407 ± 0.596, log K 2 = 4.830 ± 0.165.Fil: Ferrari, Gabriela Verónica. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Química de San Luis. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Química de San Luis; ArgentinaFil: Pappano, Nora Beatriz. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; ArgentinaFil: Debattista, Nora Beatriz. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; ArgentinaFil: Montaña, Maria Paulina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Química de San Luis. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Química de San Luis; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; ArgentinaAmerican Chemical Society2008-06info: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/11336/93012Ferrari, Gabriela Verónica; Pappano, Nora Beatriz; Debattista, Nora Beatriz; Montaña, Maria Paulina; Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes; American Chemical Society; Journal of Chemical and Engineering Data; 53; 6; 6-2008; 1241-12450021-9568CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1021/je7004598info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/je7004598info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:34:01Zoai:ri.conicet.gov.ar:11336/93012instacron: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:34982025-10-15 15:34:01.678CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes
title Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes
spellingShingle Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes
Ferrari, Gabriela Verónica
FLAVONOIDS
LANTHANUM
POTENTIOMETRIC
STABILITY CONSTANT
title_short Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes
title_full Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes
title_fullStr Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes
title_full_unstemmed Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes
title_sort Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes
dc.creator.none.fl_str_mv Ferrari, Gabriela Verónica
Pappano, Nora Beatriz
Debattista, Nora Beatriz
Montaña, Maria Paulina
author Ferrari, Gabriela Verónica
author_facet Ferrari, Gabriela Verónica
Pappano, Nora Beatriz
Debattista, Nora Beatriz
Montaña, Maria Paulina
author_role author
author2 Pappano, Nora Beatriz
Debattista, Nora Beatriz
Montaña, Maria Paulina
author2_role author
author
author
dc.subject.none.fl_str_mv FLAVONOIDS
LANTHANUM
POTENTIOMETRIC
STABILITY CONSTANT
topic FLAVONOIDS
LANTHANUM
POTENTIOMETRIC
STABILITY CONSTANT
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Flavonoids are a large family of natural compounds that includes flavones, flavonols, and chalcones, among others. These compounds are investigated due to their varied biological properties and their capacity to complex metal ions. In this work, the complexation of four 3-hydroxyflavones with the lanthanum(III) ion was studied. A series of novel complexes of La(III) with the selected 3-hydroxyflavones, 3,7-dihydroxyflavone (L1), 3,7,3′- trihydroxyflavone (L2), 3,5,7,3′,4′-pentahydroxyflavone (quercetin) (L3), and 3,5,7,2′,4′-pentahydroxyflavone (morin) (L4), were studied by means of Potentiometric and spectrophotometric methods at 26.3 °C and 0.1 M ionic strength in a water-dioxan (1:1, v/v) medium. Their formation constants were evaluated by the Calvin-Bjerrum and Irving-Rossotti methods. Complex 1:1 was found for all four ligands, whereas the 2:1 ligand-metal stoichiometry was found for only three of the four ligands. The obtained protonation constants of the ligands were: L 1, log K1H = 9.128 ±0.664; L 2, log K1H = 11.091 ± 0.134, log K 2H = 8.822 ± 5·10-4; L 3, log K2H = 9.310 ±0.119, log K 2H = 8.382 ± 0.109; L4, log K 1H = 10.021 ± 0.355, log K2H = 7.173 ± 0.576. The determined stability constants were: L 1-La(III), log K1 = 7.269 ± 0.387; L 2-La(III), log K1 = 9.164 ± 0.020, log K 2 = 5.200 ± 0.185; L3-La(III), log K1 = 8.143 ± 0.284, log K2 = 5.632 ± 0.585; L 4-La(III), log K1 = 7.407 ± 0.596, log K 2 = 4.830 ± 0.165.
Fil: Ferrari, Gabriela Verónica. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Química de San Luis. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Química de San Luis; Argentina
Fil: Pappano, Nora Beatriz. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; Argentina
Fil: Debattista, Nora Beatriz. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; Argentina
Fil: Montaña, Maria Paulina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Química de San Luis. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Química de San Luis; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Química. Área de Química Física; Argentina
description Flavonoids are a large family of natural compounds that includes flavones, flavonols, and chalcones, among others. These compounds are investigated due to their varied biological properties and their capacity to complex metal ions. In this work, the complexation of four 3-hydroxyflavones with the lanthanum(III) ion was studied. A series of novel complexes of La(III) with the selected 3-hydroxyflavones, 3,7-dihydroxyflavone (L1), 3,7,3′- trihydroxyflavone (L2), 3,5,7,3′,4′-pentahydroxyflavone (quercetin) (L3), and 3,5,7,2′,4′-pentahydroxyflavone (morin) (L4), were studied by means of Potentiometric and spectrophotometric methods at 26.3 °C and 0.1 M ionic strength in a water-dioxan (1:1, v/v) medium. Their formation constants were evaluated by the Calvin-Bjerrum and Irving-Rossotti methods. Complex 1:1 was found for all four ligands, whereas the 2:1 ligand-metal stoichiometry was found for only three of the four ligands. The obtained protonation constants of the ligands were: L 1, log K1H = 9.128 ±0.664; L 2, log K1H = 11.091 ± 0.134, log K 2H = 8.822 ± 5·10-4; L 3, log K2H = 9.310 ±0.119, log K 2H = 8.382 ± 0.109; L4, log K 1H = 10.021 ± 0.355, log K2H = 7.173 ± 0.576. The determined stability constants were: L 1-La(III), log K1 = 7.269 ± 0.387; L 2-La(III), log K1 = 9.164 ± 0.020, log K 2 = 5.200 ± 0.185; L3-La(III), log K1 = 8.143 ± 0.284, log K2 = 5.632 ± 0.585; L 4-La(III), log K1 = 7.407 ± 0.596, log K 2 = 4.830 ± 0.165.
publishDate 2008
dc.date.none.fl_str_mv 2008-06
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
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/93012
Ferrari, Gabriela Verónica; Pappano, Nora Beatriz; Debattista, Nora Beatriz; Montaña, Maria Paulina; Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes; American Chemical Society; Journal of Chemical and Engineering Data; 53; 6; 6-2008; 1241-1245
0021-9568
CONICET Digital
CONICET
url http://hdl.handle.net/11336/93012
identifier_str_mv Ferrari, Gabriela Verónica; Pappano, Nora Beatriz; Debattista, Nora Beatriz; Montaña, Maria Paulina; Potentiometric and spectrophotometric study of 3-hydroxyflavone-La(III) complexes; American Chemical Society; Journal of Chemical and Engineering Data; 53; 6; 6-2008; 1241-1245
0021-9568
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1021/je7004598
info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/je7004598
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
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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score 13.22299

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