Interactions at the molecular level between biphosphine ruthenium complexes and stearic acid in Langmuir and Langmuir-Blodgett films
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1021/jp020038t http://hdl.handle.net/11449/224300 |
Resumo: | A molecular-level interaction between biphosphine ruthenium complexes and stearic acid has been observed in Langmuir and Langmuir-Blodgett (LB) films. Similar results were obtained for the ruthenium complexes mer-[RuCl3(dppb)(4-Mepy)] (dppb = PPh2(CH2)4PPh2; 4-Mepy = 4-methylpyridine) (Rupic) and mer-[RuCl3(dppb)(py)], (pyridine) (Rupy), which differ by the substituent group in the pyridine ring. The interaction was manifested in the Langmuir films by a nonlinear increase in the area per molecule and in surface potential with the relative concentration of the ruthenium complex in the mixture. In the LB films, interaction with stearic acid occurred via complexation with Rupy or Rupic, even though the latter are not charged. It is suggested that one of the chlorides is labilized, thus promoting complexation and keeping the Ru(III) oxidation state for the complex. Complexation was confirmed through FTIR data. Interaction with stearic acid enhanced the color change characteristic of biphosphine ruthenium complexes, which may be associated with an order-induced effect or with the exposure to the water subphase in the LB film preparation. In addition, X-ray diffraction experiments failed to detect separate domains of cadmium stearate, which is also attributed to the molecular-level interaction that prevents separate stearic acid or cadmium stearate domains from being formed. |
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spelling |
Interactions at the molecular level between biphosphine ruthenium complexes and stearic acid in Langmuir and Langmuir-Blodgett filmsA molecular-level interaction between biphosphine ruthenium complexes and stearic acid has been observed in Langmuir and Langmuir-Blodgett (LB) films. Similar results were obtained for the ruthenium complexes mer-[RuCl3(dppb)(4-Mepy)] (dppb = PPh2(CH2)4PPh2; 4-Mepy = 4-methylpyridine) (Rupic) and mer-[RuCl3(dppb)(py)], (pyridine) (Rupy), which differ by the substituent group in the pyridine ring. The interaction was manifested in the Langmuir films by a nonlinear increase in the area per molecule and in surface potential with the relative concentration of the ruthenium complex in the mixture. In the LB films, interaction with stearic acid occurred via complexation with Rupy or Rupic, even though the latter are not charged. It is suggested that one of the chlorides is labilized, thus promoting complexation and keeping the Ru(III) oxidation state for the complex. Complexation was confirmed through FTIR data. Interaction with stearic acid enhanced the color change characteristic of biphosphine ruthenium complexes, which may be associated with an order-induced effect or with the exposure to the water subphase in the LB film preparation. In addition, X-ray diffraction experiments failed to detect separate domains of cadmium stearate, which is also attributed to the molecular-level interaction that prevents separate stearic acid or cadmium stearate domains from being formed.Instituto de Fisica de Sao Carlos Universidade de São Paulo, CP 369, 13560-970 São Carlos/SPEMBRAPA Instrumentacao Agropecuaria, CP 741, 13560-970 São Carlos/SPDepartamento de Física Universidade Estadual de Sao Paulo, CP 467, 19060-900 Presidente Prudente/SPDepartamento de Física Universidade Estadual de Sao Paulo, CP 467, 19060-900 Presidente Prudente/SPUniversidade de São Paulo (USP)Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)Universidade Estadual Paulista (UNESP)Ferreira, MarystelaWohnrath, KarenRiul Jr., AntonioGiacometti, José A. [UNESP]Oliveira Jr., Osvaldo N.2022-04-28T19:55:39Z2022-04-28T19:55:39Z2002-07-25info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article7272-7277http://dx.doi.org/10.1021/jp020038tJournal of Physical Chemistry B, v. 106, n. 29, p. 7272-7277, 2002.1089-5647http://hdl.handle.net/11449/22430010.1021/jp020038t2-s2.0-0037173854Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Physical Chemistry Binfo:eu-repo/semantics/openAccess2022-04-28T19:55:40Zoai:repositorio.unesp.br:11449/224300Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T19:55:40Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Interactions at the molecular level between biphosphine ruthenium complexes and stearic acid in Langmuir and Langmuir-Blodgett films |
title |
Interactions at the molecular level between biphosphine ruthenium complexes and stearic acid in Langmuir and Langmuir-Blodgett films |
spellingShingle |
Interactions at the molecular level between biphosphine ruthenium complexes and stearic acid in Langmuir and Langmuir-Blodgett films Ferreira, Marystela |
title_short |
Interactions at the molecular level between biphosphine ruthenium complexes and stearic acid in Langmuir and Langmuir-Blodgett films |
title_full |
Interactions at the molecular level between biphosphine ruthenium complexes and stearic acid in Langmuir and Langmuir-Blodgett films |
title_fullStr |
Interactions at the molecular level between biphosphine ruthenium complexes and stearic acid in Langmuir and Langmuir-Blodgett films |
title_full_unstemmed |
Interactions at the molecular level between biphosphine ruthenium complexes and stearic acid in Langmuir and Langmuir-Blodgett films |
title_sort |
Interactions at the molecular level between biphosphine ruthenium complexes and stearic acid in Langmuir and Langmuir-Blodgett films |
author |
Ferreira, Marystela |
author_facet |
Ferreira, Marystela Wohnrath, Karen Riul Jr., Antonio Giacometti, José A. [UNESP] Oliveira Jr., Osvaldo N. |
author_role |
author |
author2 |
Wohnrath, Karen Riul Jr., Antonio Giacometti, José A. [UNESP] Oliveira Jr., Osvaldo N. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Ferreira, Marystela Wohnrath, Karen Riul Jr., Antonio Giacometti, José A. [UNESP] Oliveira Jr., Osvaldo N. |
description |
A molecular-level interaction between biphosphine ruthenium complexes and stearic acid has been observed in Langmuir and Langmuir-Blodgett (LB) films. Similar results were obtained for the ruthenium complexes mer-[RuCl3(dppb)(4-Mepy)] (dppb = PPh2(CH2)4PPh2; 4-Mepy = 4-methylpyridine) (Rupic) and mer-[RuCl3(dppb)(py)], (pyridine) (Rupy), which differ by the substituent group in the pyridine ring. The interaction was manifested in the Langmuir films by a nonlinear increase in the area per molecule and in surface potential with the relative concentration of the ruthenium complex in the mixture. In the LB films, interaction with stearic acid occurred via complexation with Rupy or Rupic, even though the latter are not charged. It is suggested that one of the chlorides is labilized, thus promoting complexation and keeping the Ru(III) oxidation state for the complex. Complexation was confirmed through FTIR data. Interaction with stearic acid enhanced the color change characteristic of biphosphine ruthenium complexes, which may be associated with an order-induced effect or with the exposure to the water subphase in the LB film preparation. In addition, X-ray diffraction experiments failed to detect separate domains of cadmium stearate, which is also attributed to the molecular-level interaction that prevents separate stearic acid or cadmium stearate domains from being formed. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-07-25 2022-04-28T19:55:39Z 2022-04-28T19:55:39Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1021/jp020038t Journal of Physical Chemistry B, v. 106, n. 29, p. 7272-7277, 2002. 1089-5647 http://hdl.handle.net/11449/224300 10.1021/jp020038t 2-s2.0-0037173854 |
url |
http://dx.doi.org/10.1021/jp020038t http://hdl.handle.net/11449/224300 |
identifier_str_mv |
Journal of Physical Chemistry B, v. 106, n. 29, p. 7272-7277, 2002. 1089-5647 10.1021/jp020038t 2-s2.0-0037173854 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Physical Chemistry B |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
7272-7277 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799964680836349952 |