Rose Bengal solution

Figure 1.14B and 1.14C show the fluorescence emission spectra of a mixture of GR and Rose Bengal solutions on glass and SiFs, before and after UV... 

The encapsulation of small guest molecules was achieved by constructing the dendrimer shell in the presence of the guest molecules followed by extensive dialysis to remove free guest molecules in solution [11]. A variety of probe molecules were applied, including Rose Bengal, 7,7,8,8,-tetracyano-quino-dimethane (TCNQ) and 3-carboxy-PROXYL. UV-Vis, fluorescence and EPR... 

Bilski P, Motten AG, Bilska M, Chignell CF (1993) The photooxidation of diethylhydroxylamine by rose bengal in micellar and nonmicellar aqueous solutions. Photochem Photobiol 58 11-18. 

Fig. 2. Energy level diagram of rose bengal, chlorophyll, and anthracene in solution...

Luttrull et al. assessed the extent of dye interaction in a series of rationally synthesized dimeric Rose Bengals (Figure 14). Based on extensive studies of the spectra of these compounds in ethanol and ethanol-water, these workers concluded that the compounds exist in an open conformation in EtOH, but that the extent of dye/dye interaction increases as the solution becomes more aqueous. Thus the extinction coefficient at the maximum decreases as the amount of ethanol in the solution decreases. The more hydrophobic the groups at C-6 (changing, for example, from Na to tributylammonium), the more changing the solvent toward an increasing water content decreases the extinction coefficient, that is, enforces aggregation. 

Among the more interesting applications of polymer Rose Bengal is that of a sensitizer in studying the oxidation of other polymeric substrates [301]. Rose Bengal immobilized on Sepharose has been reported as a sensitizer for protein photooxidation [302], The oxygen uptake by the amino acids cysteine, hisitidine, methionine, tryptophan, and tyrosine was reported to be about 20% as much from the immobilized dye as from the free dye in aqueous solution. 

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