Cyclodextrin cavity size effect on the complexation and rotational dynamics of the laser dye 2,5-diphenyl-1,3,4-oxadiazole: From singly occupied complexes to their nanotubular self-assemblies

Article Abstract:

The steady-state (SS) and time-resolved (TR) fluorescence spectroscopy are used to study the general complexation scheme as well as the dynamic features of the supramolecular structures resulting from the interaction of the laser dye 2,5-diphenyl-1,3,4-oxadiazole (PPD) with the naturally occurring [alpha]-, [beta]- and [gamma]-cyclodextrins in water. The results have supported that two distinct dimeric forms of PPD play the role of the shaft between adjacent units.

Usage, Fluorescence spectroscopy, Azo compounds

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Molecular recognition kinetics of beta-cyclodextrin for several alcohols by ultrasonic relaxation method

Article Abstract:

Ultrasonic absorption coefficients alpha were measured in the frequency range 0.8-9Mhz by a resonance method in which three cells with 3,5 and 7 Mhz x-cut fundamental x-cuts crystals were investigated. The result indicates that the isometric effect of the guests on the dynamic interaction with beta-cyclodextrin was considered and it is deducted form the experimental results that the hydrophobicity is very sensitive for recognition.

Relaxation phenomena, Relaxation (Physics), Alcohols

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Complexation dynamics of xanthone and thioxanthone to (beta)-cyclodextrin derivatives

Article Abstract:

The relocation of the excited triplet-state ketones from the cyclodextrins (CD) cavity to the aqueous phase was followed for studying the complexation dynamics of xanthone and thioxanthone to substituted (beta)-cyclodextrin derivatives. Results suggest that the ground-state complexation efficiency and the binding dynamics of a neutral guest molecule is affected by the substitution on the rim of (beta)-CD.

Chemistry, Physical and theoretical, Physical chemistry, Ketones, Aqueous solution reactions

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