Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials
- Autores
- Lobayan, Rosana Maria; Bentz, Erika Natalia; Jubert, Alicia Haydee; Pomilio, Alicia Beatriz
- Año de publicación
- 2013
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The (2→O→1')-bridged 4-phenylflavans comprise an interesting structure, included in natural antioxidants such as simple and dimeric A-type proanthocyanidins, catechins and condensed tannins. This work concerns the analysis of the stereoelectronic effects induced by substitution with R=H, OH and OCH3 in Z-isomers of (4α→6', 2α→O→1')-phenylflavans using density functional methods in order to deepen the understanding of the molecular and structural properties of these compounds. A fully relaxed scan procedure was performed. A topological study of the molecular charge density (Bader theory, Atoms in Molecules) and a Natural Bond Orbital (NBO) analysis at the B3LYP/6-311++G** level were carried out. The stereochemistry of the molecules was discussed in detail focusing on the factors related to their antioxidant properties. Bond dissociation enthalpies (BDEs), ionization potentials (IPs) and electron affinities (EAs) were calculated for the lowest energy conformers. The Nuclear Magnetic Resonance (NMR) chemical shifts were also calculated at the B3LYP/6-31G** level, and compared with the earlier reported experimental values, showing that the thermodynamically most stable conformer is also the most stable kinetically. The effects of substituents on chemical shifts were quantified. Through a donor acceptor map a qualitative comparison among the studied compounds is given. The lower (higher) BDE (IP) values found for R=OH (4α→6', 2α→O→1')-phenylflavans, were explained herein by specific mechanisms of charge delocalization. These findings highlight the key role played by hyperconjugative interactions in the stereoelectronic effects induced by substitution as an important factor in understanding the associated values of BDEs and IPs.
Fil: Lobayan, Rosana Maria. Universidad de la Cuenca del Plata; Argentina. Universidad Nacional del Nordeste; Argentina
Fil: Bentz, Erika Natalia. Universidad de la Cuenca del Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Jubert, Alicia Haydee. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Química Inorgánica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Química Inorgánica "Dr. Pedro J. Aymonino"; Argentina
Fil: Pomilio, Alicia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Bioquímica y Medicina Molecular. Universidad de Buenos Aires. Facultad Medicina. Instituto de Bioquímica y Medicina Molecular; Argentina - Materia
-
ATOMS IN MOLECULES
BOND DISSOCIATION ENTHALPIES
DENSITY FUNCTIONAL THEORY
IONIZATION POTENTIALS
NATURAL BOND ORBITAL ANALYSIS
PROANTHOCYANIDINS - 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:11336/151555
Ver los metadatos del registro completo
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Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentialsLobayan, Rosana MariaBentz, Erika NataliaJubert, Alicia HaydeePomilio, Alicia BeatrizATOMS IN MOLECULESBOND DISSOCIATION ENTHALPIESDENSITY FUNCTIONAL THEORYIONIZATION POTENTIALSNATURAL BOND ORBITAL ANALYSISPROANTHOCYANIDINShttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The (2→O→1')-bridged 4-phenylflavans comprise an interesting structure, included in natural antioxidants such as simple and dimeric A-type proanthocyanidins, catechins and condensed tannins. This work concerns the analysis of the stereoelectronic effects induced by substitution with R=H, OH and OCH3 in Z-isomers of (4α→6', 2α→O→1')-phenylflavans using density functional methods in order to deepen the understanding of the molecular and structural properties of these compounds. A fully relaxed scan procedure was performed. A topological study of the molecular charge density (Bader theory, Atoms in Molecules) and a Natural Bond Orbital (NBO) analysis at the B3LYP/6-311++G** level were carried out. The stereochemistry of the molecules was discussed in detail focusing on the factors related to their antioxidant properties. Bond dissociation enthalpies (BDEs), ionization potentials (IPs) and electron affinities (EAs) were calculated for the lowest energy conformers. The Nuclear Magnetic Resonance (NMR) chemical shifts were also calculated at the B3LYP/6-31G** level, and compared with the earlier reported experimental values, showing that the thermodynamically most stable conformer is also the most stable kinetically. The effects of substituents on chemical shifts were quantified. Through a donor acceptor map a qualitative comparison among the studied compounds is given. The lower (higher) BDE (IP) values found for R=OH (4α→6', 2α→O→1')-phenylflavans, were explained herein by specific mechanisms of charge delocalization. These findings highlight the key role played by hyperconjugative interactions in the stereoelectronic effects induced by substitution as an important factor in understanding the associated values of BDEs and IPs.Fil: Lobayan, Rosana Maria. Universidad de la Cuenca del Plata; Argentina. Universidad Nacional del Nordeste; ArgentinaFil: Bentz, Erika Natalia. Universidad de la Cuenca del Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Jubert, Alicia Haydee. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Química Inorgánica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Química Inorgánica "Dr. Pedro J. Aymonino"; ArgentinaFil: Pomilio, Alicia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Bioquímica y Medicina Molecular. Universidad de Buenos Aires. Facultad Medicina. Instituto de Bioquímica y Medicina Molecular; ArgentinaElsevier Science Inc.2013-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/151555Lobayan, Rosana Maria; Bentz, Erika Natalia; Jubert, Alicia Haydee; Pomilio, Alicia Beatriz; Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials; Elsevier Science Inc.; Computational and Theoretical Chemistry; 1006; 2-2013; 37-462210-271XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S2210271X12005786info:eu-repo/semantics/altIdentifier/doi/10.1016/j.comptc.2012.11.008info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:12:30Zoai:ri.conicet.gov.ar:11336/151555instacron: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 10:12:30.624CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials |
title |
Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials |
spellingShingle |
Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials Lobayan, Rosana Maria ATOMS IN MOLECULES BOND DISSOCIATION ENTHALPIES DENSITY FUNCTIONAL THEORY IONIZATION POTENTIALS NATURAL BOND ORBITAL ANALYSIS PROANTHOCYANIDINS |
title_short |
Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials |
title_full |
Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials |
title_fullStr |
Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials |
title_full_unstemmed |
Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials |
title_sort |
Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials |
dc.creator.none.fl_str_mv |
Lobayan, Rosana Maria Bentz, Erika Natalia Jubert, Alicia Haydee Pomilio, Alicia Beatriz |
author |
Lobayan, Rosana Maria |
author_facet |
Lobayan, Rosana Maria Bentz, Erika Natalia Jubert, Alicia Haydee Pomilio, Alicia Beatriz |
author_role |
author |
author2 |
Bentz, Erika Natalia Jubert, Alicia Haydee Pomilio, Alicia Beatriz |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
ATOMS IN MOLECULES BOND DISSOCIATION ENTHALPIES DENSITY FUNCTIONAL THEORY IONIZATION POTENTIALS NATURAL BOND ORBITAL ANALYSIS PROANTHOCYANIDINS |
topic |
ATOMS IN MOLECULES BOND DISSOCIATION ENTHALPIES DENSITY FUNCTIONAL THEORY IONIZATION POTENTIALS NATURAL BOND ORBITAL ANALYSIS PROANTHOCYANIDINS |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The (2→O→1')-bridged 4-phenylflavans comprise an interesting structure, included in natural antioxidants such as simple and dimeric A-type proanthocyanidins, catechins and condensed tannins. This work concerns the analysis of the stereoelectronic effects induced by substitution with R=H, OH and OCH3 in Z-isomers of (4α→6', 2α→O→1')-phenylflavans using density functional methods in order to deepen the understanding of the molecular and structural properties of these compounds. A fully relaxed scan procedure was performed. A topological study of the molecular charge density (Bader theory, Atoms in Molecules) and a Natural Bond Orbital (NBO) analysis at the B3LYP/6-311++G** level were carried out. The stereochemistry of the molecules was discussed in detail focusing on the factors related to their antioxidant properties. Bond dissociation enthalpies (BDEs), ionization potentials (IPs) and electron affinities (EAs) were calculated for the lowest energy conformers. The Nuclear Magnetic Resonance (NMR) chemical shifts were also calculated at the B3LYP/6-31G** level, and compared with the earlier reported experimental values, showing that the thermodynamically most stable conformer is also the most stable kinetically. The effects of substituents on chemical shifts were quantified. Through a donor acceptor map a qualitative comparison among the studied compounds is given. The lower (higher) BDE (IP) values found for R=OH (4α→6', 2α→O→1')-phenylflavans, were explained herein by specific mechanisms of charge delocalization. These findings highlight the key role played by hyperconjugative interactions in the stereoelectronic effects induced by substitution as an important factor in understanding the associated values of BDEs and IPs. Fil: Lobayan, Rosana Maria. Universidad de la Cuenca del Plata; Argentina. Universidad Nacional del Nordeste; Argentina Fil: Bentz, Erika Natalia. Universidad de la Cuenca del Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Jubert, Alicia Haydee. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Química Inorgánica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Química Inorgánica "Dr. Pedro J. Aymonino"; Argentina Fil: Pomilio, Alicia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Bioquímica y Medicina Molecular. Universidad de Buenos Aires. Facultad Medicina. Instituto de Bioquímica y Medicina Molecular; Argentina |
description |
The (2→O→1')-bridged 4-phenylflavans comprise an interesting structure, included in natural antioxidants such as simple and dimeric A-type proanthocyanidins, catechins and condensed tannins. This work concerns the analysis of the stereoelectronic effects induced by substitution with R=H, OH and OCH3 in Z-isomers of (4α→6', 2α→O→1')-phenylflavans using density functional methods in order to deepen the understanding of the molecular and structural properties of these compounds. A fully relaxed scan procedure was performed. A topological study of the molecular charge density (Bader theory, Atoms in Molecules) and a Natural Bond Orbital (NBO) analysis at the B3LYP/6-311++G** level were carried out. The stereochemistry of the molecules was discussed in detail focusing on the factors related to their antioxidant properties. Bond dissociation enthalpies (BDEs), ionization potentials (IPs) and electron affinities (EAs) were calculated for the lowest energy conformers. The Nuclear Magnetic Resonance (NMR) chemical shifts were also calculated at the B3LYP/6-31G** level, and compared with the earlier reported experimental values, showing that the thermodynamically most stable conformer is also the most stable kinetically. The effects of substituents on chemical shifts were quantified. Through a donor acceptor map a qualitative comparison among the studied compounds is given. The lower (higher) BDE (IP) values found for R=OH (4α→6', 2α→O→1')-phenylflavans, were explained herein by specific mechanisms of charge delocalization. These findings highlight the key role played by hyperconjugative interactions in the stereoelectronic effects induced by substitution as an important factor in understanding the associated values of BDEs and IPs. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-02 |
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/11336/151555 Lobayan, Rosana Maria; Bentz, Erika Natalia; Jubert, Alicia Haydee; Pomilio, Alicia Beatriz; Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials; Elsevier Science Inc.; Computational and Theoretical Chemistry; 1006; 2-2013; 37-46 2210-271X CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/151555 |
identifier_str_mv |
Lobayan, Rosana Maria; Bentz, Erika Natalia; Jubert, Alicia Haydee; Pomilio, Alicia Beatriz; Charge delocalization in Z-isomers of (4α→6', 2α→O→1')-phenylflavans with R=H, OH and OCH3: Effects on bond dissociation enthalpies and ionization potentials; Elsevier Science Inc.; Computational and Theoretical Chemistry; 1006; 2-2013; 37-46 2210-271X CONICET Digital CONICET |
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/S2210271X12005786 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.comptc.2012.11.008 |
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 |
dc.publisher.none.fl_str_mv |
Elsevier Science Inc. |
publisher.none.fl_str_mv |
Elsevier Science Inc. |
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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1844614032973103104 |
score |
13.070432 |