Two-photon anisotropy: Analytical description and molecular modeling for symmetrical and asymmetrical organic dyes

dc.creatorFu, J
dc.creatorPrzhonska, OV
dc.creatorPadilha, LA
dc.creatorHagan, DJ
dc.creatorVan Stryland, EW
dc.creatorBelfield, KD
dc.creatorBondar, MV
dc.creatorSlominsky, YL
dc.creatorKachkovski, AD
dc.date2006
dc.dateFEB 6
dc.date2014-11-15T10:46:03Z
dc.date2015-11-26T17:19:36Z
dc.date2014-11-15T10:46:03Z
dc.date2015-11-26T17:19:36Z
dc.date.accessioned2018-03-29T00:07:15Z
dc.date.available2018-03-29T00:07:15Z
dc.identifierChemical Physics. Elsevier Science Bv, v. 321, n. 3, n. 257, n. 268, 2006.
dc.identifier0301-0104
dc.identifierWOS:000235440100003
dc.identifier10.1016/j.chemphys.2005.08.021
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/76836
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/76836
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/76836
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1282938
dc.descriptionOne- and two-photon anisotropy spectra of a series of symmetrical and asymmetrical polymethine (PD) and fluorene molecules were measured experimentally and discussed theoretically within the framework of three-state and four-state models. For all the molecules discussed in this paper, the experimental two-photon anisotropy values, r(2PA), lie in the relatively narrow range from 0.47 to 0.57 and remain almost independent of wavelength over at least two electronic transitions. This is in contrast with their one-photon anisotropy, which shows strong wavelength dependence, typically varying from approximate to 0 to 0.38 over the same transitions. A detailed analysis of the two-photon absorption (2PA) processes allows us to conclude that a three-state model can explain the 2PA anisotropy spectra of most asymmetrical PDs and fluorenes. However, this model is inadequate for all the symmetrical molecules. Experimental values Of r2PA for symmetrical polymethines and fluorenes can be explained by symmetry breaking leading to the deviation of the orientation of the participating transition dipole moments from their 'classical' orientations. (c) 2005 Elsevier B.V. All rights reserved.
dc.description321
dc.description3
dc.description257
dc.description268
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationChemical Physics
dc.relationChem. Phys.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectpolymethine dyes
dc.subjectfluorenes
dc.subjecttwo-photon absorption
dc.subjectone- and two-photon anisotropy
dc.subjecttransition dipole moments
dc.subjectsymmetry breaking
dc.subjectAbsorption Cross-sections
dc.subjectExcited-state Absorption
dc.subjectFluorescence Anisotropy
dc.subjectPolymethine Dyes
dc.subjectChromophores
dc.subjectExcitation
dc.subjectFluorophores
dc.subjectDerivatives
dc.titleTwo-photon anisotropy: Analytical description and molecular modeling for symmetrical and asymmetrical organic dyes
dc.typeArtículos de revistas


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