- Molecular recognition studies on supramolecular systems. 32. Molecular recognition of dyes by organoselenium-bridged bis(β-cyclodextrin)s
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A series of novel bis(β-cyclodextrin)s tethered with organoselenium linkers, i.e., 6,6′-(o-phenylenediseleno)-bridged bis(β-cyclodextrin) (2), 6,6′-[2,2′-diselenobis(benzoyloxy)]-bridged bis(β-cyclodextrin) (3), and 6,6′-[2,2′-diselenobis[2-(benzoylamino)ethylamino]]-bridged bis(β-cyclodextrin) (4), were synthesized from β-cyclodextrin (1). The inclusion complexation behavior of 1-4 with some dyes, such as 8-anilinonaphthalenesulfonate (ANS), Brilliant Green, Crystal Violet, Tropaeolin OO, Auramine O, and Methyl Orange, was investigated in aqueous phosphate buffer solution (pH 7.20) at 25 °C by UV-vis, fluorescence, and circular dichroism spectrometry, as well as fluorescence lifetime measurements. The complex stability constants (KS) and Gibbs free energy changes (δG°) for the stoichiometric 1:1 inclusion complexation of 1-4 with the dyes were obtained by the spectrophotometric or spectropolarimetric titrations. The bis(β-cyclodextrin)s 2-4 showed much higher affinities toward these guest dyes than native β-cyclodextrin I with fairly good molecular selectivities. The cooperative binding abilities of these bis(β-cyclodextrin)s are discussed from the viewpoints of size/shape-fit interaction, induced-fit concept, and multiple recognition mechanism.
- Liu,Li,You,Wada,Inoue
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p. 225 - 232
(2007/10/03)
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- Concentrated solution of a phosphate of a dyestuff of the Auramine series
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A concentrated phosphate solution of the base of a dyestuff of the Auramine series in a hydrophilic solvent (I), which solution is stable to storage and anhydrous; processes for the preparation of such a solution and use of such a solution for colouring paper or inks for flexography.
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- Anhydrous bases and salts of dyestuffs of the auramine series, process for their preparation and their use
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Process for the preparation of an anhydrous base or salt of a dyestuff of the Auramine series, which comprises isolating the base or salt in acetone, methylethylketone or diethylketone; products prepared by such a process; the hydrofluoride of the base of Auramine O; the phosphate of the base of Auramine O; the hydrobromide of the base of ethylauramine; the phosphate of the base of ethylauramine; the hydrofluoride and phosphate of the base of Auramine G and paper, inks, textile fibers, leather or plastics materials colored by the hydrofluoride of the base of Auramine O; the phosphate of the base of Auramine O; the hydrobromide of the base of ethylauramine; the phosphate of the base of ethylauramine.
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