Effect of β cyclodextrin and its derivatives on the fluorescence intensities of Al(Ⅲ) Ferron were investigated in detail.The results indicated that sensitizing effect and enhanced selectivity of the system as CTMAB ...Effect of β cyclodextrin and its derivatives on the fluorescence intensities of Al(Ⅲ) Ferron were investigated in detail.The results indicated that sensitizing effect and enhanced selectivity of the system as CTMAB and HP β CD are in coexistence,there is obvious synergistie senzitizing effect.Byusing pyrene as probe,the mechanism of the effect was discussed in the light of inclusion effect principle of the cyclodextrins.展开更多
Complexation of 4-azido-2,2,6,6-tetramethylpiperidine-1-oxyl (R1) and 4- oxybenzenesulfonyl-2,2,6,6-tetramethylpiperidine-1-oxyl (R2) with β-cyclod extrin (β-CD) and [2-O-(2-hydroxypropyl)]-β-cyclodextrin(2-HP-β-C...Complexation of 4-azido-2,2,6,6-tetramethylpiperidine-1-oxyl (R1) and 4- oxybenzenesulfonyl-2,2,6,6-tetramethylpiperidine-1-oxyl (R2) with β-cyclod extrin (β-CD) and [2-O-(2-hydroxypropyl)]-β-cyclodextrin(2-HP-β-CD) in aqueous solution have been studied by electron spin resonance (ESR). The isot ropic nitrogen hyperfine coupling constants aN and the rotational correlation ti me τC of the radicals change regularly after complexing with β-CD and 2-HP- β-CD. The magnitude of change in τC is in order: R1/2-HP-β-CD >R1/β-CD; R1/β-CD >R2/β-CD, R1/2-HP-β-CD >R2/2-HP-β-CD.展开更多
Spectrofluorometric titration and continuous variation were used to study supramolecular inclusion complexes of β-CD and its derivatives with 2-p-toluidinglnaphthalene-6-sulfonate(TNS).The stoichiometry,stability con...Spectrofluorometric titration and continuous variation were used to study supramolecular inclusion complexes of β-CD and its derivatives with 2-p-toluidinglnaphthalene-6-sulfonate(TNS).The stoichiometry,stability constants and configuration of supramolecular inclusion complexes were discussed.The results suggest that β-CD and its derivatives form 1∶1 supramolecular inclusion complexes with TNS in aqueous solutions.The hydrophobic interactions and van der Waals forces determine the stability of supramolecular inclusion complexes.The size fit between the hosts and the guest plays important roles in the formation of the supramolecular inclusion complexes.展开更多
文摘Effect of β cyclodextrin and its derivatives on the fluorescence intensities of Al(Ⅲ) Ferron were investigated in detail.The results indicated that sensitizing effect and enhanced selectivity of the system as CTMAB and HP β CD are in coexistence,there is obvious synergistie senzitizing effect.Byusing pyrene as probe,the mechanism of the effect was discussed in the light of inclusion effect principle of the cyclodextrins.
文摘Complexation of 4-azido-2,2,6,6-tetramethylpiperidine-1-oxyl (R1) and 4- oxybenzenesulfonyl-2,2,6,6-tetramethylpiperidine-1-oxyl (R2) with β-cyclod extrin (β-CD) and [2-O-(2-hydroxypropyl)]-β-cyclodextrin(2-HP-β-CD) in aqueous solution have been studied by electron spin resonance (ESR). The isot ropic nitrogen hyperfine coupling constants aN and the rotational correlation ti me τC of the radicals change regularly after complexing with β-CD and 2-HP- β-CD. The magnitude of change in τC is in order: R1/2-HP-β-CD >R1/β-CD; R1/β-CD >R2/β-CD, R1/2-HP-β-CD >R2/2-HP-β-CD.
文摘Spectrofluorometric titration and continuous variation were used to study supramolecular inclusion complexes of β-CD and its derivatives with 2-p-toluidinglnaphthalene-6-sulfonate(TNS).The stoichiometry,stability constants and configuration of supramolecular inclusion complexes were discussed.The results suggest that β-CD and its derivatives form 1∶1 supramolecular inclusion complexes with TNS in aqueous solutions.The hydrophobic interactions and van der Waals forces determine the stability of supramolecular inclusion complexes.The size fit between the hosts and the guest plays important roles in the formation of the supramolecular inclusion complexes.
