Light-Induced Structural Change in Iridium Complexes Studied by Electron Spin Resonance

dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorUniversidade de São Paulo (USP)
dc.contributorUniv Tennessee
dc.creatorBatagin-Neto, A. [UNESP]
dc.creatorAssis, A. P. [UNESP]
dc.creatorLima, J. F.
dc.creatorMagon, C. J.
dc.creatorYan, L.
dc.creatorShao, M.
dc.creatorHu, B.
dc.creatorGraeff, C. F. O. [UNESP]
dc.date2014-12-03T13:11:31Z
dc.date2014-12-03T13:11:31Z
dc.date2014-05-29
dc.date.accessioned2023-09-09T10:12:11Z
dc.date.available2023-09-09T10:12:11Z
dc.identifierhttp://dx.doi.org/10.1021/jp503831p
dc.identifierJournal Of Physical Chemistry A. Washington: Amer Chemical Soc, v. 118, n. 21, p. 3717-3725, 2014.
dc.identifier1089-5639
dc.identifierhttp://hdl.handle.net/11449/113227
dc.identifier10.1021/jp503831p
dc.identifierWOS:000336772300002
dc.identifier0000-0003-0162-8273
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8762836
dc.descriptionIridium-based compounds are materials of great interest in the production of highly efficient organic light emitting diodes and several other applications. However, these organometallic compounds present relative low stability due to photodegradation processes still not well understood. In this work we investigated paramagnetic states induced by UV photoexcitation on iridium(III) bis[(4,6-fluorophenyl)-pyridinato-N,C2']picolinate (FIrpic) and iridium(III)-tris(2-phenyl-pyridine) (Ir(ppy)(3)) complexes dispersed in different polymeric matrices by electron spin resonance (ESR). Photogenerated charged states with relatively strong hyperfine interactions were observed and attributed to matrix/complex charge-transfer processes. Measurements of the signal amplitude decay after photoexcitation interruption were performed as a function of temperature. The photoinduced centers are thermally activated with energy barrier between 0.3 and 0.6 eV. Electronic structure calculations suggest that the signals observed by ESR are associated with metastable negatively charged Jr complexes distorted structures.
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCenter for Scientific Computing (NCC/GridUNESP) of the Sao Paulo State University (UNESP)
dc.descriptionUniv Estadual Paulista, UNESP, BR-18409010 Sao Paulo, Brazil
dc.descriptionUniv Estadual Paulista, UNESP, POSMAT Programa Posgrad Ciencia & Tecnol Mat, BR-17033360 Sao Paulo, Brazil
dc.descriptionUniv Sao Paulo, Inst Fis Sao Carlos, BR-05508070 Sao Paulo, Brazil
dc.descriptionUniv Tennessee, Knoxville, TN 37996 USA
dc.descriptionUniv Estadual Paulista, UNESP, DF FC, BR-17033360 Sao Paulo, Brazil
dc.descriptionUniv Estadual Paulista, UNESP, BR-18409010 Sao Paulo, Brazil
dc.descriptionUniv Estadual Paulista, UNESP, POSMAT Programa Posgrad Ciencia & Tecnol Mat, BR-17033360 Sao Paulo, Brazil
dc.descriptionUniv Estadual Paulista, UNESP, DF FC, BR-17033360 Sao Paulo, Brazil
dc.descriptionFAPESP: 12/03116-7
dc.format3717-3725
dc.languageeng
dc.publisherAmer Chemical Soc
dc.relationJournal of Physical Chemistry A
dc.relation2.836
dc.relation1,170
dc.rightsAcesso restrito
dc.sourceWeb of Science
dc.titleLight-Induced Structural Change in Iridium Complexes Studied by Electron Spin Resonance
dc.typeArtigo


Este ítem pertenece a la siguiente institución