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dc.contributor.authorPavinatto, F. J.-
dc.contributor.authorGameiro, A. F.-
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.-
dc.contributor.authorOliveira, O. N.-
dc.identifier.citationApplied Surface Science. Amsterdam: Elsevier B.V., v. 254, n. 18, p. 5946-5952, 2008.-
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.publisherElsevier B.V.-
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.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.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.rights.accessRightsAcesso restrito-
dc.relation.ispartofApplied Surface Science-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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