Unusual interactions binding iron tetrasulfonated phthalocyanine and poly(allylamine hydrochloride) in layer-by-layer films

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dc.contributor.authorZucolotto, V
dc.contributor.authorFerreira, M.
dc.contributor.authorCordeiro, M. R.
dc.contributor.authorConstantino, CJL
dc.contributor.authorBalogh, D. T.
dc.contributor.authorZanatta, A. R.
dc.contributor.authorMoreira, W. C.
dc.contributor.authorOliveira, O. N.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:26:54Z
dc.date.available2014-05-20T15:26:54Z
dc.date.issued2003-04-24
dc.description.abstractMolecular-level interactions are found to bind iron tetrasulfonated phthalocyanine (FeTsPc) and the polyelectrolyte poly(allylamine hydrochloride) (PAH) in electroactive layer-by-layer (LBL) films. These interactions have been identified by comparing Fourier transform infrared (FTIR) and Raman spectroscopy data from bulk samples of FeTsPc and PAH with those from FeTsPc/PAH LBL films. of particular importance were the SO3- -NH3 interactions that we believe to bind PAH and FeTsPc and the interactions between unprotonated amine groups of PAH and the coordinating metal of the phthalocyanine. The multilayer formation was monitored via UV-vis spectroscopy by measuring the increase in the Q band of FeTsPc at 676 nm. Film thickness estimated with profilometry was ca. I I Angstrom per bilayer for films adsorbed on glass. Reflection absorption infrared spectroscopy (RAIRS) revealed an anisotropy in the LBL film adsorbed on gold with FeTsPc molecules oriented perpendicularly to the substrate plane. Cyclic voltammograms showed reproducible pairs of oxidation-reduction peaks at 1.07 and 0.81 V, respectively, for a 50-bilayer PAH/FeTsPc film at 50 mV/s (vs Ag/Ag+). The peak shape and current dependence on the scan rate suggest that the process is a diffusion controlled charge transport. In the presence of dopamine, the electroactivity of FeTsPc/PAH LBL films vanishes due to a passivation effect. Dopamine activity is not detected either because the interaction between Fe atoms and NH2 groups prevents dopamine molecules from coordinating with the Fe atoms.en
dc.description.affiliationIFSC, USP, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliationUFSCar, DQ, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliationUNESP, FCT, DFQB, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.affiliationUnespUNESP, FCT, DFQB, BR-19060900 Presidente Prudente, SP, Brazil
dc.format.extent3733-3737
dc.identifierhttp://dx.doi.org/10.1021/jp027573d
dc.identifier.citationJournal of Physical Chemistry B. Washington: Amer Chemical Soc, v. 107, n. 16, p. 3733-3737, 2003.
dc.identifier.doi10.1021/jp027573d
dc.identifier.issn1520-6106
dc.identifier.urihttp://hdl.handle.net/11449/36976
dc.identifier.wosWOS:000182350200011
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofJournal of Physical Chemistry B
dc.relation.ispartofjcr3.146
dc.relation.ispartofsjr1,331
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleUnusual interactions binding iron tetrasulfonated phthalocyanine and poly(allylamine hydrochloride) in layer-by-layer filmsen
dc.typeArtigo
dcterms.licensehttp://pubs.acs.org/paragonplus/copyright/jpa_form_a.pdf
dcterms.rightsHolderAmer Chemical Soc
unesp.author.orcid0000-0003-4307-3077[1]
unesp.author.orcid0000-0002-9459-8167[2]
unesp.author.orcid0000-0002-9196-3982[5]
unesp.author.orcid0000-0002-5217-7524[6]
unesp.author.orcid0000-0002-5399-5860[8]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências e Tecnologia, Presidente Prudentept
unesp.departmentFísica, Química e Biologia - FCTpt

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Presidente Prudente - FCT - Faculdade de Ciências e Tecnologia