Strong difference between optical properties and morphologies for J-Aggregates of similar cyanine dyes

Strong difference between optical properties and morphologies for J-Aggregates of similar cyanine dyes

Optical properties and morphologies of molecular aggregates of two similar cyanine dyes (BIC and TDBC) have been studied. The dyes have the same 5,5′,6,6′-tetrachlorobenzimidacarbocyanine chromophore part and differ just in one methyl group in alkyl chains. Due to such a similarity of the dye molecu...

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Bibliographic Details
Published in:Dyes and pigments Vol. 152; pp. 49 - 53
Main Authors: Sorokin, Alexander V., Ropakova, Iryna Yu, Grynyov, Roman S., Vilkisky, Michael M., Liakh, Victoria M., Borovoy, Igor A., Yefimova, Svetlana L., Malyukin, Yuri V.
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-05-2018
Subjects:
Cyanine dye
Exciton
Fluorescence
J-aggregate
J-aggregate morphology
Quantum yield
Fluorescence
J-aggregate
Exciton
J-aggregate morphology
Quantum yield
Cyanine dye
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Summary:Optical properties and morphologies of molecular aggregates of two similar cyanine dyes (BIC and TDBC) have been studied. The dyes have the same 5,5′,6,6′-tetrachlorobenzimidacarbocyanine chromophore part and differ just in one methyl group in alkyl chains. Due to such a similarity of the dye molecular structures, their aggregates are often supposed to have similar structure. However the difference in optical properties was reported in some publications assuming different structures of the J-aggregates. Indeed, we have found distinct morphologies for BIC and TDBC J-aggregates: spherical species for BIC J-aggregates and rod-like ones for TDBC J-aggregates. The difference in morphologies and, hence, structures is the reason of unlike optical properties of these J-aggregates. [Display omitted] •TDBC and BIC cyanine dyes have minor difference in their structures and spectra.•J-aggregates of the dyes reveal significant difference in their optical properties.•The exciton delocalization lengths for TDBC and BIC J-aggregates differ in 3 times.•The reason for distinct spectra of the J-aggregates is their different morphology.
ISSN:0143-7208
1873-3743
DOI:10.1016/j.dyepig.2018.01.032