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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/93012
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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 Técnicas2025-09-29T10:36:25Zoai: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:34982025-09-29 10:36:25.867CONICET 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 |
_version_ |
1844614384668639232 |
score |
13.070432 |