An Alternative Interpretation for the Spectral Response of Self-Assembled Pseudoisocyanine J-Aggregates in Aqueous Solution

Date

2009-04-01

Author

Gulen, Demet

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An alternative interpretation for the optical response of pseudoisocyanine J-aggregates is given on the basis of a recently suggested monomeric absorption spectrum exhibiting the seemingly universal spectral fingerprint of cyanines. Temperature-dependence of the generic J-aggregate absorption spectra reported in the literature is quantified by employing simulations obtained in the Frenkel exciton formalism augmented by diagonal energetic disorder and exciton-phonon coupling. It is concluded that the pseudoisocyanine J-aggegates are formed mainly through aggregation of precursor aggregates with absorption around 525 nm upon decrease of temperature and/or increase of dye concentration. This conclusion opposes the common view which attributes the formation of pseudoisocyanine J-aggregates to aggregation of precursors of H-aggregate in nature and to monomers. It is expected that a large number of observations on optical response, and aggregation kinetics, which are still debated on and have been forced to be reconciled in a self-consistent picture through a variety of assumptions, can find reasonable explanations within the alternative viewpoint promoted in this note.

Subject Keywords

Electrical and Electronic Engineering, General Materials Science, General Chemistry, Condensed Matter Physics, Computational Mathematics

URI

https://hdl.handle.net/11511/63636

Journal

JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE

DOI

https://doi.org/10.1166/jctn.2009.1115

Collections

Department of Physics, Article

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Citation Formats

D. Gulen, “An Alternative Interpretation for the Spectral Response of Self-Assembled Pseudoisocyanine J-Aggregates in Aqueous Solution,” JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE, pp. 834–840, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/63636.