Mueller Matrix Polarimetry on Cyanine Dye J -Aggregates

Cyanine dyes are known to form - and -aggregates in aqueous solutions. Here we show that the cyanine dye, S0271, assembles in water into vortex induced chiral -aggregates. The chirality of the -aggregates depends on the directionality of the vortex. This study utilised both conventional benchtop CD...

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Published inMolecules (Basel, Switzerland) Vol. 28; no. 4; p. 1523
Main Authors Clowes, Samuel R, Răsădean, Dora M, Gianga, Tiberiu-M, Jávorfi, Tamás, Hussain, Rohanah, Siligardi, Giuliano, Pantoş, G Dan
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 04.02.2023
MDPI
Subjects
Aggregates
Aqueous solutions
Birefringence
Chirality
circular dichroism
Cyanine dyes
Dichroism
Dyes
Experiments
J-aggregates
Linear dichroism
Mueller matrix polarimetry
Polarimetry
Spectrum analysis
Vortices
Mueller matrix polarimetry
circular dichroism
J-aggregates
cyanine dyes
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Summary:Cyanine dyes are known to form - and -aggregates in aqueous solutions. Here we show that the cyanine dye, S0271, assembles in water into vortex induced chiral -aggregates. The chirality of the -aggregates depends on the directionality of the vortex. This study utilised both conventional benchtop CD spectropolarimeters and Mueller matrix polarimetry. It was found that -aggregates have real chirality alongside linear dichroism and linear and circular birefringence. We identify the factors that are key to the formation of metastable chiral -aggregates and propose a mechanism for their assembly.
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ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28041523