Fluorescence Properties of Coumarin Laser Dyes in Aqueous Polymer Media. Chromophore Isolation in Poly(methacrylic acid) Hypercoils

Coumarin and carbazole fluorescently modified cellulose nanocrystals using a one‐step esterification procedure

“…At the same time, coumarin derivatives are important fluorescent dyes with high photoluminescence quantum efficiencies, and uses in optoelectronic materials, while they also display anti-tumoral, anti-coagulant, and anti-oxidant properties. [27][28][29][30][31] Fillponen et al covalently linked an azide-bearing fluorescent molecule in a three step reaction: TEMPO mediated oxidation was followed by propargylamine grafting by carbodiimide-mediated amide coupling followed by a Copper(I)-catalysed AzideAlkyne Cycloaddition reaction (i.e. azide-alkyne click reaction) with azido-coumarin and azido-anthracene.…”

Photoluminescence properties of polystyrene-hosted fluorophore thin films

“…The red-shift of the emission peak 4,5 observed in polar media is due to stabilization of a twisted intra-molecular chargetransfer (TICT) state in which the dialkyl substituted amino group is twisted about the long molecular axis. 14 The presence of the second peak and its nearly featureless shape shown in FIG. 1(a) indicate that excimers of Coumarin 6 are formed in the polymer by conjugation of excited-state monomers.…”

“…25 In such cases, the fluorescence emission may have preferential direction as well, which is azimuthally symmetric, but anisotropic with respect to the direction normal to the thin-film surface. 14,36 Although, in our experiments, all measurements are performed at a certain elevation angle with respect to the normal to the thin film surface, time-resolved and steady state anisotropy measurements may lead to more complete understanding of the emission processes.…”

“…2,10-15 Coumarin 6 is a benzopyrone-class dye with a dialkyl-substituted amino-group and a benzothiazole-group asymmetrically placed around a lactone-ring. It absorbs and emits in the visible spectrum, however, significant spectral shift and quenching in fluorescence emission, depending on polarity of solvent 4,5 and concentration of polymer, 14,16 have been reported. PPO and POPOP comprise of phenyl-oxazole chains with one and two oxazole rings respectively, whereas PTP is from a polyphenyl group with three co-linear phenyl-rings.…”

Complexes of polyelectrolyte hydrogels with organic dyes: Effect of charge density on the complex stability and intragel dye aggregation

“…3,4 A new prospective direction is the study of gel-dye complexes as the medium for optical applications. 5,6 Up to now the interaction between anionic dyes and water-soluble cationic polyelectrolytes was studied for several systems. [7][8][9][10][11][12][13][14] It is known that under certain conditions in concentrated enough aqueous solutions the dye molecules aggregate due to their hydrophobic attraction.…”