Closely Stacked Oligo(phenylene ethynylene)s: Effect of π-Stacking on the Electronic Properties of Conjugated Chromophores.
In this work, a bicyclo[4.4.1]undecane scaffold is used to hold oligo(phenylene ethynylene) units in a cofacially stacked arrangement along the entire length of the conjugated units. We study the impact that the resulting strong interchain interactions have on the photophysical properties. The lengt...
| Publicado en: | Journal of the American Chemical Society Vol. 134; no. 16; pp. 7176 - 7186 |
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| Autores principales: | , , , , , |
| Formato: | Artículo |
| Publicado: |
American Chemical Society
4/25/2012
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=74970574&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 74970574 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 4/25/2012 vid: 134 iid: 16 pid: 997 pub: American Chemical Society artinfo: ui: 74970574 10.1021/ja3019065 ppf: 7176 ppct: 10 formats: tig: atl: Closely Stacked Oligo(phenylene ethynylene)s: Effect of π-Stacking on the Electronic Properties of Conjugated Chromophores. aug: au: Jagtap, Subodh P. Mukhopadhyay, Sukrit Coropceanu, Veaceslav Brizius, Glen L. Brédas, Jean-Luc Collard, David M. affil: School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology Atlanta, Georgia 30332-0400, United States su: Stacking interactions Bioconjugates Oligomers Density functionals Chromophores Electric properties sug: subj: Stacking interactions Bioconjugates Oligomers Density functionals Chromophores Electric properties ab: In this work, a bicyclo[4.4.1]undecane scaffold is used to hold oligo(phenylene ethynylene) units in a cofacially stacked arrangement along the entire length of the conjugated units. We study the impact that the resulting strong interchain interactions have on the photophysical properties. The length of the individual oligomer branches was varied from three to five rings to investigate the effect of conjugation on the electronic properties of the stacked segments. Absorption and fluorescence spectra were recorded and compared to those of the corresponding unstacked analogues. Time-dependent density functional theory calculations were carried out and helped to rationalize the low-energy features present in the fluorescence spectra of the stacked systems. The calculations indicate that the low-energy emissions are due to the presence of excimer-like states. The stronger intensity of the low-energy fluorescence band observed in the five-ring stacked system compared to the three-ring analogue is attributed to the smaller activation barrier that separates the local intrachain state and the excimer-like state in the former compound. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2012 holdings: @attributes: islocal: N |
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