Excitonic treatment and bonding of aggregates of Rhodamine 6G in ethanol

Abstract

The self-association of Rhodamine 6G in ethanol has been studied by determining the dimerization and trimerization constants at different temperatures. The excitonic interpretation of the absorption spectra suggests a linear structure for the aggregates. The nature of the bonding has been also studied.

Dual fluorescence and laser emissions from fluorescein-Na and eosin-B

“…Generally, at higher concentration, quenching of fluorescence from monomeric species takes place mainly due to the inactive absorption of the exciting light by non-luminescent aggregates, as well as due to the migration of energy of electronic excitation from monomers to such aggregates. However, as reported for the case of Rh-6G dye [7,[28][29][30], dimers of the present dyes can participate effectively in the formation of stimulated emission both by monomers and dimers. Since the emission spectra of dimers are not separated from those of monomers, the generation efficiency cannot be estimated.…”

Raman imaging studies on the adsorption of methylene blue species onto silver modified linen fibers

“…It is well known that molecular association affects the color and photo‐physical properties of dyes in solution . The formation of molecular aggregates due to electrostatic attraction depends on several factors such as dye concentration, ionic strength of the medium, temperature, solvent, and pH .…”

Remarks on Fluorescence Concentration Quenching of Rhodamine 6G in Methanol

“…oligomers, excimers as well as statistical pairs [1][2][3][4][5][6][7][8][9]. These centres can absorb the exciting light or constitute traps for the excitation energy transferred to them from the excited monomers.…”