Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/2385
Title: Absorption spectrum of monomeric pseudoisocyanine: A new perspective and its implications for formation and spectral response of J-aggregates in solution and in thin films
Authors: Gülen, Demet
Özçelik, Serdar
Keywords: Monomers
Frenkel exciton
J-aggregates
Pseudoisocyanine
UV-vis absorption
Issue Date: May-2008
Publisher: Elsevier Ltd.
Source: Gülen, D., and Özçelik, S. (2008). Absorption spectrum of monomeric pseudoisocyanine: A new perspective and its implications for formation and spectral response of J-aggregates in solution and in thin films. Journal of Luminescence, 128(5-6), 834-837. doi:10.1016/j.jlumin.2007.11.019
Abstract: We argued against the current spectral assignment for absorption spectrum of monomeric PIC which is widely accepted since the pioneering works of Scheibe and Jelley [G. Scheibe, Angew. Chem. 49 (1936) 563; E.E. Jelly, Nature 138 (1936) 1009]. A new spectrum is presented along with its conceptual basis. The hypothesized spectrum attributes the previous 0-0 (≈525 nm) and 0-1 (≈490 nm) assignments, respectively, to intermediates acting as the precursor of J-aggregates and to the 0-0 transition of monomeric PIC and brings the spectrum in accord with the seemingly universal spectral fingerprint of cyanines. The hypothesis is used to analyze and interpret the temperature dependence of the UV-vis absorption of PIC aggregates in saline aqueous solution by incorporating the J-band simulations within frenkel exciton formalism. Its implications for aggregate formation kinetics are given on the basis of current spectroscopic evidence. The hypothesis readily answers several long-standing questions: Why compared to many other cyanines at least an order of magnitude higher dye concentration is needed to form J-aggregates of PIC? Why are there no precursors, since aggregation is expected to be a consecutive process? A large number of observations on steady-state and time-resolved spectral properties, and aggregation kinetics in solution/thin films are likely to find reasonable explanations within this hypothesis.
Description: Proceedings of the 16th International Conference on Dynamical Processes in Excited States of Solids
URI: http://doi.org/10.1016/j.jlumin.2007.11.019
http://hdl.handle.net/11147/2385
ISSN: 0022-2313
0022-2313
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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