Synthesis and Spectroscopic Properties of New Rose Bengal and Eosin Y Derivatives

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

doi:10.1016/0143-7208(90)85017-i

Cited by 48 publications

(20 citation statements)

References 40 publications

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“…[53]). The difference in the absorption cross-section spectra is thought to be caused by the presence of fluorescein derivatives with a lower degree of bromination [6,[54][55][56] in our recrystallized dye.…”

Section: Dye Preparationmentioning

confidence: 99%

“…For the S () -S t ground-state absorption of the pump pulses LI and L2 the absorption anisotropy is taken into account by the angle dependent absorption cross-section or L (6) = 3cr L cos 2 0, where 0 is the angle between the SQ-SJ transition dipole moment of the molecules and the direction of the electric field of the linearly polarized laser light. For the S,-S" excited state absorption of the pump pulses LI and L2 an isotropic absorption dynamics is used in the equation system since the relative orientation between § {) - § x transition dipole moments and the S,-S" transition dipole moments is unknown._At highjnimp intensities the Sj-level populations N 2 (6) and N 3 (0) approach the isotropic distribution N 2 and N 3 because of nearly complete depletion of the ground-state population N { . Therefore the isotropic excited singlet state absorption approach gives correct excited state absorption cross-sections a cx .…”

Section: (Idmentioning

confidence: 99%

“…It is applied as a photo-oxidation sensitizer due to its high efficiency of singlet oxygen generation [3][4][5][6]. Laser action of eosin Y was achieved in various solvents [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Intersystem-crossing and excited-state absorption in eosin Y solutions determined by picosecond double pulse transient absorption measurements

Penzkofer

Beidoun

Daiber

1992

Journal of Luminescence

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Section: Dye Preparationmentioning

confidence: 99%

Section: (Idmentioning

confidence: 99%

See 1 more Smart Citation

Intersystem-crossing and excited-state absorption in eosin Y solutions determined by picosecond double pulse transient absorption measurements

Penzkofer

Beidoun

Daiber

1992

Journal of Luminescence

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“…In the photopolymer system, this dye must adopt mainly the quinonoid form, with an absorption spectrum with a maximum flanked by two bad-defined shoulders (Fig, 1), as observed in other xanthene dyes in neutral media. 9 However, the high transmision value measured at 514 nm points to the presence of an important proportion of the ionized form of 21SF, non distinguishable in the absorption spectrum of the solution. The presence of colorless xanthydrolic and ethylenic forms, already observed in the parent non-halogenated dye succiylfluorescein,'° can't be disregarded.…”

Section: -Results and Discussionmentioning

confidence: 99%

<title>Sensitivity enhancement in panchromatic photopolymers for holography using a mixture of visible-light photoinitiators</title>

Fimia¹,

Mateos

Sastre

et al. 1996

SPIE Proceedings

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Photopolymers usually present lower energetic sensitivity, and to narrower wavelength range, than other more conventional recording materials for Holography such as dichromated gelatins. We have previously overcome some of these disadvantages using a mixture of visible light photoinitiators. In present communication we describe a new aqueous photopolymer containing the monomers , methylenbisacrylamide and zinc acrylate, the initiators 4,5-diiodosuccinyfluoroscein (21SF) and Methylene Blue (MB), and the coinitiator sodium p-toluensulfinate. This formulation exhibits a dramatic enhancement of the energetic sensitivity upon radiation with 5 14 or 633 nm light (Ar or He-Ne laser respectively), with regard to the same mixture but with only one dye, reaching maximum diffraction efficiencies of 15-20 % with 15-60 mJ cm2 This enhancement is explained trough a more efficient photogeneration of iniciator radicals by the ground-state formation of on ion-pair complex between cationic (MB) and anionic (21SF) chromophoros, the proximity of which must favor electron transfer between groups.This must compensate the observed absorvance decrease at 5 14 nm, with regard to the absorbance of 21SF alone in the same medium (maximum absorption at 490 nm). A clear absorbance increase at 633 nm, with regard to the absorbance of MB alone (maximum absorption at 660 nm), must also favor the phothpolymerization.

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“…EoB was recrystallized from methanol. Details of purification methods can be found in reference [28].…”

Section: Methodsmentioning

confidence: 99%

Photophysical Behavior of Modified Xanthenic Dyes Embedded into Silsesquioxane Hybrid Films: Application in Photooxidation of Organic Molecules

Waiman

Palacios

Montejano

et al. 2017

International Journal of Photoenergy

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Polymeric materials based on a bridged silsesquioxane with pendant dodecyl chains were synthesized and modified with different xanthenic dyes with the aim of developing a material with potential application in photooxidation of organic compounds. The employed dyes constitute a family of novel xanthenic chromophores with outstanding properties as singlet oxygen photosensitizers. The hybrid matrix was chosen for its enhanced properties such as flexibility and chemical resistance. The employed dyes were easily incorporated into the hybrid polymer obtaining homogeneous, transparent, and low-refractive-index materials. The polymeric films were characterized using UV-Vis absorption, fluorescence, and laser flash photolysis techniques. The ability of these materials to produce singlet oxygen was tested following the photooxidation of 9,10-dimethylanthracene which is a well-known chemical trap for singlet oxygen. High photooxidation efficiencies were observed for these materials, which present the advantage of being easily removed/collected from the solution where photooxidation takes place. While photobleaching of the incorporated dyes is commonly observed in the solution, it takes place very slowly when dyes are embedded in the hybrid matrix. These properties bode well for the potential use of these materials in novel wastewater purification strategies.

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Synthesis and Spectroscopic Properties of New Rose Bengal and Eosin Y Derivatives

Cited by 48 publications

References 40 publications

Intersystem-crossing and excited-state absorption in eosin Y solutions determined by picosecond double pulse transient absorption measurements

Intersystem-crossing and excited-state absorption in eosin Y solutions determined by picosecond double pulse transient absorption measurements

<title>Sensitivity enhancement in panchromatic photopolymers for holography using a mixture of visible-light photoinitiators</title>

Photophysical Behavior of Modified Xanthenic Dyes Embedded into Silsesquioxane Hybrid Films: Application in Photooxidation of Organic Molecules

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