The photoluminescence response of Rhodamine 6G (R6G) laser dye intercalated into solid thin films Laponite (Lap) clay is studied as a function loading. Fluorescence spectroscopy (steady-state and time-resolved techniques) was used to characterize the R6G species adsorbed films. For very diluted loadings (</=0.1% CEC, i.e., percentage total cation exchange capacity Lap) fluorescence properties monomer were characterized, which presents an emission band centered at 548 nm, average lifetime 4.2...

The formation constant and absorption spectrum of the dimer Rhodamine 6G have been evaluated: trimer is not formed. geometric structure aggregate determined using exciton theory. thermodynamics dimerization process permit study association forces, justifying structural differences from those exhibited by B dimers.

Highly emitting 8-propargylaminoBODIPY (8-PAB) 2 was prepared in 94% yield. Unlike any other BODIPY structure hitherto described the literature, displays efficient emission blue region of visible spectrum with a fluorescence quantum yield up to 0.94 and high laser efficiency (35%) at 483 nm.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics of rhodamines: molecular structure and solvent effectsF. Lopez Arbeloa, T. M. J. Tapia Estevez, I. ArbeloaCite this: Phys. Chem. 1991, 95, 6, 2203–2208Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published inissue 1 March 1991https://pubs.acs.org/doi/10.1021/j100159a022https://doi.org/10.1021/j100159a022research-articleACS PublicationsRequest reuse permissionsArticle...

To develop the solid-state laser oscillator based on dye compounds, incorporation of rhodamine 6G (R6G, a dye) in cetyltrimethylammonium (CTA+) cationic surfactant/montmorillonite clay hybrid (HpC) thin solid films was investigated. The R6G/HpC samples were prepared by immersing HpC into R6G aqueous solution with various concentration. X-ray diffraction patterns HpC, measured before and after intercalation R6G, proved coexistence both surfactant interlayer spaces. All exhibited luminescence....

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen-bonding effect on the photophysical properties of 7-aminocoumarin derivativesTeresa Lopez Arbeloa, Fernando M. Jose Tapia, and Inigo ArbeloaCite this: J. Phys. Chem. 1993, 97, 18, 4704–4707Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 1993https://pubs.acs.org/doi/10.1021/j100120a024https://doi.org/10.1021/j100120a024research-articleACS PublicationsRequest reuse permissionsArticle...

The molecular structure and the photophysical properties of pyrromethene-BF2 (PM) dyes are studied with aim finding best structural environmental conditions which optimize laser performance these dyes. To this end, UV–Vis absorption fluorescence spectra decay curves several PM registered in a multitude solvents different physicochemical polymeric solid matrices. Quantum mechanical calculations at levels also applied order to explain behaviour pyrromethenes incorporate alkyl (methyl, ethyl...

The trimerization equilibrium constant of rhodamine 6 G in aqueous solution as determined by absorption spectroscopy is higher than that the dimer previously reported. Similarities observed between spectra both aggregates are explained exciton theory considering a sandwich structure for aggregates. lack emission from implies an important decrease fluorescence quantum yield dye, and rate quenching produced trimer calculated separately. dominant mechanism seems to be long-range energy transfer...

We report on the photophysical properties and laser action of five newly synthesized dipyrromethene·BF2 complexes that are analogues dye PM567 dissolved in apolar, polar nonprotic, protic solvents, paying attention to effect concentration. All these dyes have a common chromophore core differ length 8-(ω-acetoxy)polymethylene substituent. When pumped transversely at 534 nm, efficiencies up 59% were obtained, which found be nearly independent nature solvent polymethylene chain. Good...

UV−vis absorption spectroscopy and fluorescence (steady-state time-resolved) techniques were used to study the photophysical properties of pyrromethene 597 (PM597) dye in several solvents, which include a wide range apolar, polar, protic media. This presents lower quantum yield than well-known PM567 because an increase nonradiative deactivation rate constant. is attributed loss planarity excited state provided by steric hindrance tert-butyl groups at positions 2 6 chromophore core. Such...

Absorption and fluorescence (steady-state time-correlated) techniques are used to study the photophysical characteristics of pyrromethene 650 (PM650) dye. The presence cyano group at 8 position considerably shifts absorption bands lower energies with respect other related dyes; this is attributed strong electron-acceptor character group, as theoretically confirmed by quantum mechanical methods. properties PM650 intensively solvent-dependent. band shifted in polar/protic solutions, evolution...

New BODIPY dyes with two 4-formylphenyl, 4-(2,2-dimethoxycarbonylvinyl)phenyl and 4-(2,2-dicyanovinyl)phenyl groups at the 3- 5-positions have been successfully designed synthesized via palladium-catalyzed coupling reaction or Knoevenagel-type condensations. Structural modification of core conjugation-extending residues significantly affects spectroscopy photophysical properties fluorophore. These substituents cause largest bathochromic shift in both absorption emission spectra, which are...

The aggregation process of Rhodamine 6G (R6G) laser dye intercalated in supported thin films Laponite clay (Lap) is analyzed by means electronic absorption spectroscopy. Two procedures are proposed to express the analytical concentration solid samples with respect a reference-diluted film normalization-concentration factor. From evolution concentration-normalized spectra factor, nonlinear least-squares fitting equation obtained from mass law, characteristics and constant dimer R6G Lap were...

A new fluorescence polarization method is applied to evaluate the preferential orientation of rhodamine 6G (R6G) adsorbed into laponite (Lap) clay mineral in supported films. For this purpose, spectra for horizontal and vertical directions emission polarizer were recorded a common horizontally polarized excitation light as function twist angle δ film with respect (and emission) beam. The fluorescent species films can be evaluated from linear relationship between dichroic ratio recently...

We report on the synthesis and photophysical lasing properties of two new dipyrromethene·BF2 dyes, analogues commercial dye PM567, dissolved in liquid solutions or polymeric matrices poly(methyl methacrylate) as solid copolymers with methyl methacrylate, where chromophore is covalently bound to chains. The dyes have 8 position substituted by group p-(acetoxypolymethylene)phenyl p-(methacryloyloxypolymethylene)phenyl (number methylenes = 1 3). Good correlations between dilute characteristics...

New tailormade BODIPY dyes have been synthesized by a simple protocol to reach wavelength finely tunable laser action from 540 625 nm while maintaining highly efficient and photostable emission. The new are analogues of the commercial dye PM597 with eight position free (PTH8) or substituted groups acetoxymethyl (PTAlk) p-acetoxymethylphenyl (PTAr). photophysical properties strongly depend on geometrical distortion planarity indacene core generated presence bulky 2,6-di-tert-butyl...

Abstract The adsorption isotherm of methylene blue (MB) on sepiolite gels is the Langmuir type, indicating a great affinity MB towards sepiolite; quantitative up to 0·1 mmol/g sepiolite. differences observed in absorption spectrum region 500–650 nm for different loadings are interpreted terms aggregation molecules surface with formation dimers, trimers and higher aggregates. progressive coverage by produces sharp decrease viscosity gels, suspension becomes peptized an loading 0·21 which...