Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/4117
Title: Investigation of structure-spectroscopy-function relationship of twodimensional J-aggregates of tetrachlorobenzimidazolorcarbocyanine preferentially oriented in poly-vinly-alcohol thin films
Authors: Gülen, Demet
Atasoylu, Onur
Özçelik, Serdar
Keywords: J-aggregates
Frenkel exciton
Phonon-assisted exciton relaxation
Davydov splitting
Polarized UV–Vis absorption
Vertical spin coating
Cyanines
Issue Date: Jan-2009
Publisher: Elsevier Ltd.
Source: Gülen, D., Atasoylu, O., & Özçelik, S. (2009). Investigation of structure-spectroscopy-function relationship of twodimensional J-aggregates of tetrachlorobenzimidazolorcarbocyanine preferentially oriented in poly-vinly-alcohol thin films. Chemical Physics, 355(1), 73–80. doi:10.1016/j.chemphys.2008.11.005
Abstract: The structure–spectroscopy–function relationship of 1,1 0 ,3,3 0 -tetraethyl-5,5 0 ,6,6 0 -tetrachlorobenzimidazolocarbocyanine (TTBC) aggregates is studied using a combination of experimental and theoretical techniques. The aggregates are macroscopically aligned in poly-vinyl-alcohol thin films by vertical spin coating. Angular dependence of the UV–Vis spectra is measured at eleven different orientations between the electric field polarization and the macroscopic alignment axis. The aggregates are characterized by a pair of Davydov split bands with opposite polarization behaviors: an H-band (505 nm) and a J-band (594 nm) polarized respectively, close to being parallel and perpendicular to the alignment axis. Spectral response is interpreted via simulations within the Frenkel exciton formalism. TTBC aggregates are shown to assume very similar internal molecular packing (herringbone) and dynamics of excited states (phononassisted intraband and interband relaxations) in ionic aqueous solution and in thin films. The general conclusions on the structure–spectroscopy–function relationship are expected to hold for other cyanine aggregates with the same generic spectral features.
URI: http://dx.doi.org/10.1016/j.chemphys.2008.11.005
http://hdl.handle.net/11147/4117
Appears in Collections:Chemistry / Kimya
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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