Langmuir and Langmuir-Blodgett (LB) films of tetrapyridyl metalloporphyrins

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dc.contributor.authorPavinatto, F. J.
dc.contributor.authorGameiro, A. F. [UNESP]
dc.contributor.authorHidalgo, A. A.
dc.contributor.authorDinelli, L. R.
dc.contributor.authorRomualdo, L. L.
dc.contributor.authorBatista, A. A.
dc.contributor.authorBarbosa Neto, N. M.
dc.contributor.authorFerreira, M. [UNESP]
dc.contributor.authorOliveira, O. N.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Uberlândia (UFU)
dc.contributor.institutionFundação Educac Barretos
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2014-05-20T13:23:02Z
dc.date.available2014-05-20T13:23:02Z
dc.date.issued2008-07-15
dc.description.abstractWe report on the formation of Langmuir films of 5,10,15,20-tetra(4-pyridyl) 21H,23H-porphine,hereafter named tetrapyridyl porphyrins with distinct central ions (2H(+), Zn(2+), Cu(2+), Ni(2+)). The films were characterized with surface pressure and surface potential isotherms and in situ UV-vis absorbance. The measurements indicated strong aggregation of porphyrin monomers at the air-water interface, with a red shift of the Soret band in comparison with the spectrum obtained from CHCl(3) solutions. The shift was larger for the non-substituted H(2)TPyP, and depended on the metal ion. Significantly, aggregation occurred right after spreading of the Langmuir film, with on further shifts in the UV-vis spectra upon compression of the film, or even after transferring them onto solid substrates in the form of Langmuir-Blodgett (LB) films. The buildup of LB films from H(2)TPyP and ZnTPyP was monitored with UV-vis spectroscopy, indicating an equal amount of material deposited in each deposition step. Using FTIR in the transmission and reflection modes, we inferred that the H(2)TPyP molecules exhibit no preferential orientation in the LB films, while for ZnTPyP there is preferential orientation, with the porphyrin molecules anchored to the substrate by the lateral pyridyl groups. (C) 2008 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv São Paulo, Inst Fis São Carlos, BR-13560970 São Carlos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Depto Fis Quim & Biol, Fac Ciencias & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.affiliationUniversidade Federal de Uberlândia (UFU), Inst Fis, BR-38400902 Uberlandia, MG, Brazil
dc.description.affiliationFundação Educac Barretos, BR-14783226 Barretos, SP, Brazil
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), Dept Quim, BR-13565905 São Carlos, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Depto Fis Quim & Biol, Fac Ciencias & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.format.extent5946-5952
dc.identifierhttp://www.sciencedirect.com/science/article/pii/S0169433208006673
dc.identifier.citationApplied Surface Science. Amsterdam: Elsevier B.V., v. 254, n. 18, p. 5946-5952, 2008.
dc.identifier.issn0169-4332
dc.identifier.urihttp://hdl.handle.net/11449/6875
dc.identifier.wosWOS:000256815000054
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofApplied Surface Science
dc.relation.ispartofjcr4.439
dc.relation.ispartofsjr1,093
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjecttetrapyidyl porphyrinsen
dc.subjectLangmuir filmsen
dc.subjectLangmuir-Blodgett filmsen
dc.titleLangmuir and Langmuir-Blodgett (LB) films of tetrapyridyl metalloporphyrinsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.orcid0000-0002-9459-8167[8]
unesp.author.orcid0000-0002-5399-5860[9]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências e Tecnologia, Presidente Prudentept

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