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dc.contributor.authorAlsam, Amani A.
dc.contributor.authorAly, Shawkat Mohammede
dc.contributor.authorUsman, Anwar
dc.contributor.authorParida, Manas R.
dc.contributor.authorDel Gobbo, Silvano
dc.contributor.authorAlarousu, Erkki
dc.contributor.authorMohammed, Omar F.
dc.date.accessioned2015-09-09T05:45:54Z
dc.date.available2015-09-09T05:45:54Z
dc.date.issued2015-09-02
dc.identifier.citationBimolecular Excited-State Electron Transfer with Surprisingly Long-Lived Radical Ions 2015:150902050947004 The Journal of Physical Chemistry C
dc.identifier.issn1932-7447
dc.identifier.issn1932-7455
dc.identifier.doi10.1021/acs.jpcc.5b06636
dc.identifier.urihttp://hdl.handle.net/10754/576981
dc.description.abstractWe explored the excited-state interactions of bimolecular, non-covalent systems consisting of cationic poly[(9,9-di(3,3’-N,N’-trimethyl-ammonium) propyl fluorenyl-2,7-diyl)-alt-co-(9,9-dioctyl-fluorenyl-2,7-diyl)] diiodide salt (PFN) and 1,4-dicyanobenzene (DCB) using steady-state and time-resolved techniques, including femto- and nanosecond transient absorption and femtosecond infrared spectroscopies with broadband capabilities. The experimental results demonstrated that photo-induced electron transfer from PFN to DCB occurs on the picosecond time scale, leading to the formation of PFN+• and DCB-• radical ions. Interestingly, real-time observations of the vibrational marker modes on the acceptor side provided direct evidence and insight into the electron transfer process indirectly inferred from UV-Vis experiments. The band narrowing on the picosecond time scale observed on the antisymmetric C-N stretching vibration of the DCB radical anion provides clear experimental evidence that a substantial part of the excess energy is channeled into vibrational modes of the electron transfer product and that the geminate ion pairs dissociate. More importantly, our nanosecond time-resolved data indicate that the charge-separated state is very long lived ( 30 ns) due to the dissociation of the contact radical ion pair into free ions. Finally, the fast electron transfer and slow charge recombination anticipate the current donor−acceptor system with potential applications in organic solar cells.
dc.language.isoen
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttp://pubs.acs.org/doi/10.1021/acs.jpcc.5b06636
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/10.1021/acs.jpcc.5b06636.
dc.titleBimolecular Excited-State Electron Transfer with Surprisingly Long-Lived Radical Ions
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.identifier.journalThe Journal of Physical Chemistry C
dc.eprint.versionPost-print
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personAly, Shawkat Mohammede
kaust.personUsman, Anwar
kaust.personParida, Manas R.
kaust.personDel Gobbo, Silvano
kaust.personAlarousu, Erkki
kaust.personMohammed, Omar F.
kaust.personAlsam, Amani Abdu
refterms.dateFOA2016-09-02T00:00:00Z


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