Ethyl eosine

Photoinduced electron transfer from eosin and ethyl eosin to Fe(CN)g in AOT/heptane-RMs was studied and the Hfe time of the redox products in reverse micellar system was found to increase by about 300-fold compared to conventional photosystem [335]. The authors have presented a kinetic model for overall photochemical process. Kang et al. [336] reported photoinduced electron transfer from (alkoxyphenyl) triphenylporphyrines to water pool in RMs. Sarkar et al. [337] demonstrated the intramolecular excited state proton transfer and dual luminescence behavior of 3-hydroxyflavone in RMs. In combination with chemiluminescence, RMs were employed to determine gold in aqueous solutions of industrial samples containing silver alloy [338, 339]. Xie et al. [340] studied the a-naphthyl acetic acid sensitized room temperature phosphorescence of biacetyl in AOT-RMs. The intensity of phosphorescence was observed to be about 13 times higher than that seen in aqueous SDS micelles. 

Pemberton and Johnson [175,176] have performed a thorough study of the photopolymerization of vinyl acetate in aqueous methanol sensitized by ethyl Eosin and ascorbic acid. In agreement with Oster s results, these authors find that polymer is not formed in the absence of oxygen. In addition, dye photobleaching without polymer formation is observed when water is excluded. 

Another redox system, ethyl eosin/ascorbic acid in aqueous methanol solution, has been proposed 74,75). In fact, hydrogen peroxide is generated and its association with ascorbic acid initiates the polymerization. 

Hydroxytelechelic poly(vinyl acetate)s have been synthesized with redox system such as ethyl eosine-ascorbic acid-visible light in aqueous methanol74). The irradiation of the dye-acid system leads to hydrogen peroxide formation and then to the generation of hydroxyl radicals which initiate polymerization. The following initiation mechanism has been suggested 74,75)... 

Ethyl eosine in the triplet state can react with ascorbic acid (AH2) and yields a dye semiquinone (DH) and acid semi-oxide (A") ... 

Visible light induces hydrogen peroxide formation in ascorbic acid and ethyl eosine solution, and H202 initiates the polymerization of vinyl acetate 74,75). 

The cationic hexa-ammine complex of Pt(IV) gives an ion-pair with the acid dye, ethyl eosin, and this is also used in determinations of platinum (e = 8.0-10 ) [47,48]. 

Preparation of micrometer-sized microspheres of poly(styrene-co-butyl methacrylate) by dispersion polymerization in the presence of dyes such as Nigrosin, Sudan red 7B, Sudan black B, rhodamine B base, ethyl eosin, phenolphthalein. Disperse orange 13, and Disperse blue [87]. 

Other Names Ethyl eosin Fluorescein, 2, 4, 5, 7 -tetra-hromo-, ethyl ester, potassium derivative Fluorescein, 2, 4, 5, 7 -tetrahromo-, ethyl ester, potassium salt C.I. 45386 C.I. Solvent Red 45 Ethyl eosine Y NSC 8670 Spirit Eosine Spirit Primrose DH... 

Sodium salt of eosin. Grind together in a mortar 12 g. of eosin with 2 g. of anhydrous sodium carbonate. Transfer the mixture to a 250 ml. conical flask, moisten it with 10 ml. of rectified spirit, add 10 ml. of water and warm on a water bath, with stirring, until the evolution of carbon dioxide ceases. Add 50 ml. of ethyl alcohol, heat to boiling, and filter the hot solution through a fluted filter paper (supported in a short-stemmed funnel) into a beaker, and allow to stand overnight. Filter ofiF the browiiish-red crystals of sodium eosin, wash with a little alcohol, and dry. The yield is 10 g. 

The first sensor proposed for detecting gastric and oesophageal pH24, made use of two fluorophores, fluorescein and eosin, immobilised onto fibrous particles of amino-ethyl cellulose, fixed on polyester foils. Only tested in vitro, the sensor reveals a satisfactory response time of around 20 seconds. 

To evaluate the bar-coded slide labels supplied by Ventana, a number of tests were done by placing bar-code-labeled slides in vials containing eosin, hematoxylin, 100% ethyl alcohol, or xylene for 5 min. All labels subjected to these tests remained firmly affixed to the slides. In a second test of the bar codes, a number 2 pencil was used to place marks onto the bar codes in an... 

We have performed laser flash photolysis experiments in ethyl acetate/20% methanol under conditions in which triplet-triplet annihilation is not important. We achieve these conditions by using Eosin concentrations higher than 1 x 10 5 M and low pulse energies in order to obtain clean exponential decays for the triplet. Determination of the triplet lifetime at different Eosin and amine concentrations allows us to obtain the rate constants collected in Table 5. A summary of our observations is as follows ... 

TABLE 5 Triplet Decay Rate Constants for Eosin in Ethyl Acetate/20% Methanol"... 

Steady-state irradiation of Eosin and PDO leads to the formation of ethyl benzoate, benzil, and benzoyloxycarboxylate. Energy transfer from Eosin to PDO is unfavorable and the decomposition of PDO is most likely sensitized by electron transfer. In addition, at the concentration of PDO employed the fluorescence of Eosin is not significantly quenched and it is concluded that the excited state involved is the triplet of Eosin. 

By treating the potassium salt of eosin with methyl iodide or chloride, or with ethyl bromide, monomethyl- and monoethyl-ethers of eosin may be obtained, and these even surpass the eosins in brilliancy of shade, their tone being in general somewhat bluer. 

The ethyl ether, in form of its sodium or potassium salt, is extensively used in silk-dyeing as spirit eosin or primerose h kalcool/ For use, the commercial product is dissolved in spirit and gradually added to the dye-bath, which is acidified with acetic acid. 

Copper can be determined by use of ion associates, formed by the cationic complexes of Cu(I) with cuproine [63-65], neocuproine [65], bathocuproine [66] and thio-crown ethers [67,68], associated with the acid dyes such as Rose Bengal (e = 7.8-10 ) [63,65,66], the ethyl ester of eosin (e = 9.4-10 ) [64], and Erythrosin [63]. These ion-associates are extracted into chloroform [65,66], 1,2-dichloroethane [64,67,68], and other solvents. The ion-associates of cyanide [69] and chloride [70,71] complexes of Cu(I) with Methylene Blue (1,2-dichloroethane, = 9.8-10 ) [69], and Ethyl Violet (toluene, = 9.6-10 ) [70] are also worth mentioning. The halide complexes of Cu(I) with azo dyes have also been extracted. 

Black sand Titanium tetra-isopropoxide (1.5 mL) is dissolved in isopropanol (40.0 mL). Pre-dried Si/Black sand particles (0.2 g) are dispersed in the solution and sonicated for 0.5 h. Then, it is stirred for 5. The mixture is heated at 80°C for 3 h and then calcined at 450°C for 3 h Removal of six dyes Direct red 80, Eosin B, Rose bengal. Orange II, Ethyl violet, Rhodamine B [512]... 

Eosin Y. See Acid red 87 Eosin YS. See D C Red No. 22 Acid red 87 EOTMPTA. SeeTrimethylolpropane ethoxytriacrylate EP 2220 TC. See Epoxy resin EP. See p-Ethylphenol Propylene glycol ethyl ether... 

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