Molecular assemblies of polymethine dyes

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

“…From superpositions of these excitation waves, the 'excitation packets' can be formed, which describes the coherent motion of (localized) excitations [50]. In this way the excitation can migrate over hundreds of monomers [15,17]. This is an essential difference from the Förster-type excitation energy transfer, in which the chromophores retain their identity and their oscillating dipoles interact at a distance.…”

“…The results of application of both experimental and theoretical methods were presented in a book edited by Kobayashi [16]. Different possibilities of assembling cyanine dyes into their aggregates were analyzed by Shapiro [17]. Kirstein and Daehne [18] focused on the possibilities of forming tubular J-aggregated structures mimicking the natural lightharvesting complexes by proper chemical modifications of cyanine dyes.…”

The influence of temperature on optical properties of merocyanine dye thin films

“…In this case, we suppose that higher temperature assists orthogonal arrangement of dye molecules in dimer. Thus, splitting becomes minimal, and the maximum of absorption approaches to that of an individual molecule [20].…”

“…Dye association proceeds on the substrate surface during deposition; it is not excluded, however, that dye molecules can also evaporate in the form of associates but not as individual molecules. As it is known [20], dye molecule interaction in film leads to appearance of various aggregates, for example dimers. Due to molecule interaction, the splitting of the first electron level occurs complying with the Davidov rules.…”

Dissimilar Associates of Dyes in Aqueous Solutions: Experimental Study and Computer Simulation

“…The processes of association of dye molecules have a significant effect on the light absorption and luminescence of aqueous solutions [1][2][3][4]. The formation of dimers and more associated structures (self-associates) is recorded at concentrations of 5·10 -5 mol/L and higher [5][6][7][8][9][10][11].…”