Spectral properties and structure of the J-aggregates of pseudoisocyanine dye in layered silicate films

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

“…These facts demonstrate that the interaction with the charged macromolecules neutralizing the charge of cyanine dye does not always result in dye aggregation into regular and stable J-form. The skill of researcher is to provide proper conditions for selfassembly, since the monomeric dyes and their dimers can also bind strongly to different charged structures preventing the formation of J-aggregates [143].…”

“…For some cyanine dyes in layered silicate dispersions based on natural and synthetic clay minerals the stabilization of J-aggregates against decomposition has been achieved [143]. J-aggregates are readily formed in nanocavities [154], as well as on the surface of semiconductor nanoparticles: CdTe [155] and CdSe [156,157].…”

Photophysics of Auramine O adsorbed on solid clays

“…Dyes adsorbed onto solid clays systems are studied to determine position, the geometry and orientation of the dyes in relation to the clay surfaces and changes in the interbasal distances of the clay layers [17][18][19].…”

Fluorescence tuning of 2D montmorillonite optically active layers with beta-cyclodextrine/dye supramolecular complexes

“…Due to the rapid energy relaxation in H-aggregate, their fluorescence is suppressed, but in some cases can be observed in monomers with a low fluorescence yield (Lakowicz, 2006). On the other hand, J-aggregates, with an oblique structure, exhibit only transitions to the low energy states of the exciton band and are characterised by a high fluorescence quantum yield in comparison with monomers (Bujdák and Iyi, 2008). For these reasons we assume that the broad band in fluorescence spectra located at 700 nm originates from the presence of the fraction of molecules forming J-aggregates.…”

“…The ion-ion interaction among molecules of cationic dye and the negative surface charge of montmorillonite layers represents a very strong non-covalent interaction. Clearly, the adsorption of organic cationic species is an experimentally straightforward task (Janek and Lagaly, 2003;Bujdák and Iyi, 2008). Nevertheless, the high local charge density distribution, including domain areas existing on the clay mineral surface, is the greatest obstacle to control formation of desired dye aggregates for 2D surface functionalization (Lagaly and Weiss, 1975;Ogawa et al, 1996;Janek et al, 1997;Bujdák et al, 2001).…”