Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties

Autores
Sueldo Occello, Valeria Noemi; Hoyos, Maria Rita Micaela; Veglia, Alicia Viviana
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The influence of the macrocyclic compound cucurbit[6]uril (CB6) on the photophysical properties of the fluorophore pyrene (PYR) has been studied. Guest–host interaction was observed by UV–visible spectroscopy and spectrofluorimetry. The fluorescence of PYR was significantly increased in the presence of CB6. The binding equilibrium constants for the complex with 1:1 stoichiometry were determined in HCOOH 55% w/v. The values of the association constants, KA, and the fluorescence quantum yield ratios between complexed and free substrate, ϕPYR–CB6/ϕPYR, at different temperatures were (3.1±0.9)×102 M−1 and (5.1±0.2), (3.6±0.5)×102 M−1 and (5.9±0.1), (4.8±0.7)×102 M−1 and (5.5±0.1) at 15.0 °C, 25.0 °C and 40.0 °C, respectively. The enthalpic and entropic contributions to the complexation process were determined, yielding ΔS=(92±3) J mol−1 K−1 and ΔH=(13±1) kJ mol−1. From these results it can be concluded that the complex formation is mainly driven by the entropic term. The forces involved in the complexation are interpreted from the sign and magnitude of the thermodynamic parameters obtained. The partial inclusion of PYR or the formation of a suspended complex is proposed in base of all the data. The interaction is also demonstrated in the solid state by differential scanning calorimetric (DSC) measurements.
Fil: Sueldo Occello, Valeria Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Hoyos, Maria Rita Micaela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Veglia, Alicia Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Materia
Cucurbit[6]Uril
Pyrene
Complex Formation
Spectrofluorimetry
Spectrophotometry
Hydrophobic Effects
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:11336/31490
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/31490
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic propertiesSueldo Occello, Valeria NoemiHoyos, Maria Rita MicaelaVeglia, Alicia VivianaCucurbit[6]UrilPyreneComplex FormationSpectrofluorimetrySpectrophotometryHydrophobic Effectshttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The influence of the macrocyclic compound cucurbit[6]uril (CB6) on the photophysical properties of the fluorophore pyrene (PYR) has been studied. Guest–host interaction was observed by UV–visible spectroscopy and spectrofluorimetry. The fluorescence of PYR was significantly increased in the presence of CB6. The binding equilibrium constants for the complex with 1:1 stoichiometry were determined in HCOOH 55% w/v. The values of the association constants, KA, and the fluorescence quantum yield ratios between complexed and free substrate, ϕPYR–CB6/ϕPYR, at different temperatures were (3.1±0.9)×102 M−1 and (5.1±0.2), (3.6±0.5)×102 M−1 and (5.9±0.1), (4.8±0.7)×102 M−1 and (5.5±0.1) at 15.0 °C, 25.0 °C and 40.0 °C, respectively. The enthalpic and entropic contributions to the complexation process were determined, yielding ΔS=(92±3) J mol−1 K−1 and ΔH=(13±1) kJ mol−1. From these results it can be concluded that the complex formation is mainly driven by the entropic term. The forces involved in the complexation are interpreted from the sign and magnitude of the thermodynamic parameters obtained. The partial inclusion of PYR or the formation of a suspended complex is proposed in base of all the data. The interaction is also demonstrated in the solid state by differential scanning calorimetric (DSC) measurements.Fil: Sueldo Occello, Valeria Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Hoyos, Maria Rita Micaela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Veglia, Alicia Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaElsevier Science2014-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/31490Veglia, Alicia Viviana; Hoyos, Maria Rita Micaela; Sueldo Occello, Valeria Noemi; Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties; Elsevier Science; Journal of Luminescence; 158; 10-2014; 435-4400022-2313CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0022231314006024info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jlumin.2014.10.031info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:49:23Zoai:ri.conicet.gov.ar:11336/31490instacron: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 09:49:23.974CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties
title Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties
spellingShingle Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties
Sueldo Occello, Valeria Noemi
Cucurbit[6]Uril
Pyrene
Complex Formation
Spectrofluorimetry
Spectrophotometry
Hydrophobic Effects
title_short Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties
title_full Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties
title_fullStr Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties
title_full_unstemmed Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties
title_sort Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties
dc.creator.none.fl_str_mv Sueldo Occello, Valeria Noemi
Hoyos, Maria Rita Micaela
Veglia, Alicia Viviana
author Sueldo Occello, Valeria Noemi
author_facet Sueldo Occello, Valeria Noemi
Hoyos, Maria Rita Micaela
Veglia, Alicia Viviana
author_role author
author2 Hoyos, Maria Rita Micaela
Veglia, Alicia Viviana
author2_role author
author
dc.subject.none.fl_str_mv Cucurbit[6]Uril
Pyrene
Complex Formation
Spectrofluorimetry
Spectrophotometry
Hydrophobic Effects
topic Cucurbit[6]Uril
Pyrene
Complex Formation
Spectrofluorimetry
Spectrophotometry
Hydrophobic Effects
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 influence of the macrocyclic compound cucurbit[6]uril (CB6) on the photophysical properties of the fluorophore pyrene (PYR) has been studied. Guest–host interaction was observed by UV–visible spectroscopy and spectrofluorimetry. The fluorescence of PYR was significantly increased in the presence of CB6. The binding equilibrium constants for the complex with 1:1 stoichiometry were determined in HCOOH 55% w/v. The values of the association constants, KA, and the fluorescence quantum yield ratios between complexed and free substrate, ϕPYR–CB6/ϕPYR, at different temperatures were (3.1±0.9)×102 M−1 and (5.1±0.2), (3.6±0.5)×102 M−1 and (5.9±0.1), (4.8±0.7)×102 M−1 and (5.5±0.1) at 15.0 °C, 25.0 °C and 40.0 °C, respectively. The enthalpic and entropic contributions to the complexation process were determined, yielding ΔS=(92±3) J mol−1 K−1 and ΔH=(13±1) kJ mol−1. From these results it can be concluded that the complex formation is mainly driven by the entropic term. The forces involved in the complexation are interpreted from the sign and magnitude of the thermodynamic parameters obtained. The partial inclusion of PYR or the formation of a suspended complex is proposed in base of all the data. The interaction is also demonstrated in the solid state by differential scanning calorimetric (DSC) measurements.
Fil: Sueldo Occello, Valeria Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Hoyos, Maria Rita Micaela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Veglia, Alicia Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
description The influence of the macrocyclic compound cucurbit[6]uril (CB6) on the photophysical properties of the fluorophore pyrene (PYR) has been studied. Guest–host interaction was observed by UV–visible spectroscopy and spectrofluorimetry. The fluorescence of PYR was significantly increased in the presence of CB6. The binding equilibrium constants for the complex with 1:1 stoichiometry were determined in HCOOH 55% w/v. The values of the association constants, KA, and the fluorescence quantum yield ratios between complexed and free substrate, ϕPYR–CB6/ϕPYR, at different temperatures were (3.1±0.9)×102 M−1 and (5.1±0.2), (3.6±0.5)×102 M−1 and (5.9±0.1), (4.8±0.7)×102 M−1 and (5.5±0.1) at 15.0 °C, 25.0 °C and 40.0 °C, respectively. The enthalpic and entropic contributions to the complexation process were determined, yielding ΔS=(92±3) J mol−1 K−1 and ΔH=(13±1) kJ mol−1. From these results it can be concluded that the complex formation is mainly driven by the entropic term. The forces involved in the complexation are interpreted from the sign and magnitude of the thermodynamic parameters obtained. The partial inclusion of PYR or the formation of a suspended complex is proposed in base of all the data. The interaction is also demonstrated in the solid state by differential scanning calorimetric (DSC) measurements.
publishDate 2014
dc.date.none.fl_str_mv 2014-10
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/11336/31490
Veglia, Alicia Viviana; Hoyos, Maria Rita Micaela; Sueldo Occello, Valeria Noemi; Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties; Elsevier Science; Journal of Luminescence; 158; 10-2014; 435-440
0022-2313
CONICET Digital
CONICET
url http://hdl.handle.net/11336/31490
identifier_str_mv Veglia, Alicia Viviana; Hoyos, Maria Rita Micaela; Sueldo Occello, Valeria Noemi; Complexation (cucurbit[6]uril-pyrene): Thermodynamicand spectroscopic properties; Elsevier Science; Journal of Luminescence; 158; 10-2014; 435-440
0022-2313
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/S0022231314006024
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jlumin.2014.10.031
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
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
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 13.070432

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