Results 301 to 310 of about 203,448 (330)
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The photophysics of rhodamine B
Journal of Photochemistry, 1982Abstract The effects of solvent viscosity and dielectric constant on the photophysics of rhodamine B in its protonated and zwitterion forms were studied. The internal conversion rate is dependent on the S 1 -S 0 energy separation and increases when this gap is lowered through rotation of the diethylamino groups. Comparison is made with rhodamine 640
F. E. Treloar +3 more
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On the aggregation of rhodamine B in ethanol
Chemical Physics Letters, 1988Abstract The dimer and the trimer aggregation constants of the cationic form of rhodamine B are determined in very concentrated ethanolic solutions of the dye. The absorption spectrum, the geometrical structure and the association bonding of the aggregates are discussed and compared with those previously obtained in aqueous solution.
F. López Arbeloa +2 more
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Mediation of rhodamine B photodegradation by biochar
Chemosphere, 2020Significant degradation of organic contaminants in biochar sorption systems has recently been reported, demonstrating a promising potential application of biochar in pollution control. We hypothesized that the degradation of organic chemicals by biochar may be further enhanced under irradiation by UV light due to the photocatalytic activities of ...
Bo Pan +7 more
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Aggregation of Rhodamine B in Water
Russian Journal of Applied Chemistry, 2004Protolytic and associative equilibria in aqueous solutions of rhodamine B were studied. The curves of potentiometric titration with NaOH solution of the dye hydrochloride within the 5 ×10-4-3 ×10-2 M range and at an ionic strength of 0.1 M (NaCl or KCl) were treated by chemometric methods of successive modification of the equilibrium system models with
N. O. Mchedlov-Petrosyan, Yu. V. Kholin
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A new application of Rhodamine 200 B (Sulfo Rhodamine B)
Dyes and Pigments, 1995Abstract The laser dye Rhodamine 200 B (Sulfo Rhodamine B) (CI Acid Red 52) can be used as a fluorescent counterion for the transfer of various cationic species (e.g. cationic surfactants and crown-complexes of metal ions) into a chloroform phase. The extraction of ionic associates is found to be independent of the acidity of the aqueous phase within
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Chemical Physics Letters, 1973
Abstract The visible absorption fluorescence and phosporescence spectra and the polarized fluorescence and phosphorescence excitation spectra have been measured for the dimer form of rhodamine B. The rhodamine B dimer is somewhat unique in that it exhibits both fluorescence and phosphorescence whereas other dyes usually exhibit only phosphorescence ...
Richard W. Chambers +2 more
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Abstract The visible absorption fluorescence and phosporescence spectra and the polarized fluorescence and phosphorescence excitation spectra have been measured for the dimer form of rhodamine B. The rhodamine B dimer is somewhat unique in that it exhibits both fluorescence and phosphorescence whereas other dyes usually exhibit only phosphorescence ...
Richard W. Chambers +2 more
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Application of solutions of Rhodamine B in dosimetry
Applied Radiation and Isotopes, 2014Aqueous solutions of the organic dye Rhodamine B were found to be useful in measuring radiation doses in the range 0.1-2 kGy. Either spectrophotometric or spectrofluorometric measurements can be used. The dosimeter readout is unchanged for at least 60 days after irradiation if the solution is kept in the dark at room temperature.
S.M. Gafar +3 more
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Molecular forms of rhodamine B
Chemical Physics Letters, 1981Abstract Three molecular forms of rhodamine B (neutral, cationic and cationic-lactonic) in aqueous solutions are reported. The pka of the equilibria between the neutral and cationic forms as well as cationic and cationic-lactonic ones are evaluated. The dimerization constants of neutral and cationic forms (coloured) are also determined.
I. López Arbeloa, P.Ruiz Ojeda
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The composition of rhodamine b chlorogallate
Analytica Chimica Acta, 1961Abstract The formula of rhodamine Bchlorogallate has been shown to be (RH) GaCl4,where R == rhodamine B.
F. Culkin, J.P. Riley
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Chemical Physics Letters, 1982
Abstract Aggregation of the coloured neutral and cationic forms of rhodamine β in aqueous solution has been studied. The formation constants and absorption of the dimers were determined. The geometric disposition of monomers in both aggregates and the nature of the association forces are discussed. Trimers are not formed.
I. López Arbeloa, P.Ruiz Ojeda
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Abstract Aggregation of the coloured neutral and cationic forms of rhodamine β in aqueous solution has been studied. The formation constants and absorption of the dimers were determined. The geometric disposition of monomers in both aggregates and the nature of the association forces are discussed. Trimers are not formed.
I. López Arbeloa, P.Ruiz Ojeda
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