Thermal decarboxylation of rose bengal dye

Amat‐Guerri, F.; López-González, M.M.C.; Martínez-Utrilla, R.

doi:10.1016/s0040-4039(01)81418-0

Cited by 8 publications

(5 citation statements)

References 4 publications

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“…The order with respect to light intensity is 0.5 (Figure 10), and at constant intensity the rate of photopolymerization is independent of the Bo" concentration (Figure 11). On the basis of these results we write for the initial rate of photopolymerization Figure 11. Plot of the initial rate of photopolymerization against the concentration of triphenyl n-butyl borate ion: [RBAX] = 5.0 X 10"4 M, /" = 6.84 X 10"4 einstein/L s. The average value for the rate of photopolymerization is 0.36 ± 0.03 M/s. "…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Photopolymerization studies using visible light photoinitiators

Valdes-Aguilera¹,

Pathak²,

Shi³

et al. 1992

Macromolecules

113

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Section: Resultsmentioning

confidence: 99%

“…Rose Bengal was decarboxylated following suggested literature procedures by heating in DMF. 11 The decarboxylated product (hereafter RB) was purified first by washing with copious quantities of water and then with hexane.…”

Section: Methodsmentioning

confidence: 99%

Photopolymerization studies using visible light photoinitiators

Valdes-Aguilera¹,

Pathak²,

Shi³

et al. 1992

Macromolecules

113

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“…To study the generation of superoxide anion radical O

_{2}^{.−}

after photoexcitation of 1 – 7 , EPR spin‐trapping was carried out with DMPO as the spin trapper 34, 35. After 20 min of irradiation with a 250‐W halogen lamp only 4 showed a very low‐intensity EPR signal (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Values of Φ 1 O 2 were determined using an equation that describes the change in concentration c A (mol dm −3 ) of a singlet oxygen acceptor (with known β value) after irradiation for a given time t (s) in the presence of a singlet oxygen generator (sensitizer 1 – 7 ) that absorbs a photon flux I a (mol s −1 dm −3 ) (Fig. 3):34, 35 …”

Section: Methodsmentioning

confidence: 99%

Photostability of D–π–A nonlinear optical chromophores containing a benzothiazolium acceptor

Cigáň

Gáplovský

Sigmundová

et al. 2010

J of Physical Organic Chem

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For the practical application of second‐order NLO materials, not only a high molecular quadratic hyperpolarizability β but also good thermal, chemical, and photochemical stabilities are required. Most of the state‐of‐the‐art chromophores with high NLO response cannot be put to use because they are photochemically highly unstable. Good thermal and photochemical stabilities with preserved high hyperpolarizabilities can be achieved by replacement of an aromatic ring with easily delocalizable heteroaromatics, e.g., with benzothiazole. Furthermore, desirable modifications of the benzothiazole fragment lead to improvement in β values. Here we report results of a comprehensive investigation of the photochemical stability of seven D–π–A push–pull molecules based on a N‐methylbenzothiazolium acceptor and a N,N‐dimethylaminophenyl donor with a different length of conjugated bridge and different acceptor strength. The quantum yield (Φ) and the kinetic parameters of photoreactions were determined for existing photodegradation pathways on irradiation at 300–850 nm in MeOH. Trans–cis photoisomerization is proposed as a fast but inefficient photobleaching mechanism for these irradiation wavelengths. Self‐sensitized photooxidation by 1O2 makes very slow parallel photodegradation pathway and, albeit to small value of Φ, plays a dominant role in the photodegradation of the compounds investigated. Both structural modifications (extension of conjugated bridge and an additional acceptor group bonded to heterocycle) resulting in an increase of NLO response led to a decrease in photostability due to the self‐sensitized 1O2 photooxidative attack. Thus a compromise should be found between an increase in NLO response and a decrease in photostability to make a choice of studied compounds for practical applications. Copyright © 2010 John Wiley & Sons, Ltd.

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“…Organic solid-state laser devices offer the promise of building broadly tunable coherent sources in the visible spectrum, at low cost [1]. Due to a large number of available emitters (from small molecular dyes [2,3] to conjugated polymers or hybrid inorganic-organic materials [4], which all can cover a large span of wavelengths) and their ability to form clean amorphous films, a diversified variety of laser designs can be implemented, with a much higher flexibility compared to inorganics in terms of building complex structures wherein different functional materials are either mixed, or deposited on top of each other, or next to one another. In addition of the traditional technique of thermal vacuum evaporation, inexpensive solution-based processes have emerged such as dip-coating [5], doctor-blading [6], horizontal dipping [7], or spin-coating [8].…”

Section: Introductionmentioning

confidence: 99%

Inkjet-printed vertically emitting solid-state organic lasers

Mhibik

Chénais

Forget

et al. 2016

Journal of Applied Physics

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International audienceIn this paper, we show that Inkjet Printing can be successfully applied to external-cavity vertically-emitting thin-film organic lasers, and can be used to generate a diffraction-limited output beam with an output energy as high as 33.6 µJ with a slope efficiency S of 34%. Laser emission shows to be continuously tunable from 570 to 670 nm using an intracavity polymer-based Fabry-Perot etalon. High-optical quality films with several µm thicknesses are realized thanks to ink-jet printing. We introduce a new optical material where EMD6415 commercial ink constitutes the optical host matrix and exhibits a refractive index of 1.5 and an absorption coefficient of 0.66 cm-1 at 550-680 nm. Standard laser dyes like Pyromethene 597 and Rhodamine 640 are incorporated in solution to the EMD6415 ink. Such large size " printed pixels " of 50 mm 2 present uniform and flat surfaces, with roughness measured as low as 1.5 nm in different locations of a 50µm x 50µm AFM scan. Finally, as the gain capsules fabricated by Inkjet printing are simple and do not incorporate any tuning or cavity element, they are simple to make, have a negligible fabrication cost and can be used as fully disposable items. This works opens the way towards the fabrication of really low-cost tunable visible lasers with an affordable technology that has the potential to be widely disseminated

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Thermal decarboxylation of rose bengal dye

Cited by 8 publications

References 4 publications

Photopolymerization studies using visible light photoinitiators

Photopolymerization studies using visible light photoinitiators

Photostability of D–π–A nonlinear optical chromophores containing a benzothiazolium acceptor

Inkjet-printed vertically emitting solid-state organic lasers

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