The Diffusion Coefficient of the 1:1 γ-Cyclodextrin Inclusion Complex of C[sub 60] via Hydrodynamic Modulation at a Rotating Disk Electrode

2000 ◽  
Vol 147 (7) ◽  
pp. 2625 ◽  
Author(s):  
Wenju Feng ◽  
Barry Miller
Keyword(s):  
Diffusion Coefficient ◽  
Inclusion Complex ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Disk Electrode ◽  
Cyclodextrin Inclusion ◽  
Cyclodextrin Inclusion Complex ◽  
Hydrodynamic Modulation

Evaluation of the diffusion coefficient of the zincate ion using a rotating disk electrode

1986 ◽  
Vol 64 (3) ◽  
pp. 523-527 ◽  
Author(s):  
Elisabete Jorge Pessine ◽  
Silvia M. L. Agostinho ◽  
Hélio C. Chagas
Keyword(s):  
Aqueous Solution ◽  
Diffusion Coefficient ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Experimental Results ◽  
Alkali Concentration ◽  
Disk Electrode ◽  
Disc Electrode ◽  
Einstein Theory ◽  
Temperature Range

Using a rotating Hg-film disc electrode, the diffusion coefficient of the zincate ion in a 1–4 M aqueous solution of NaOH was measured. Experiments covered a temperature range from 25 to 40 °C. The experimental results are in agreement with the predictions of the Stokes–Einstein theory for diffusivity. The obtained Stokes radii decrease with increasing alkali concentration, but the ratio Dη/T is reasonably constant within the whole range of temperature investigated

scholarly journals Comprehensive Characterisation of the Ketoprofen-β-Cyclodextrin Inclusion Complex Using X-ray Techniques and NMR Spectroscopy

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 4089
Author(s):  
Katarzyna Betlejewska-Kielak ◽  
Elżbieta Bednarek ◽  
Armand Budzianowski ◽  
Katarzyna Michalska ◽  
Jan K. Maurin
Keyword(s):  
Nmr Spectroscopy ◽  
Inclusion Complex ◽  
Crystal And Molecular Structure ◽  
Binding Constants ◽  
Nmr Studies ◽  
X Ray ◽  
Cyclodextrin Inclusion ◽  
Powder Samples ◽  
Cyclodextrin Inclusion Complex ◽  
Co Precipitation

Racemic ketoprofen (KP) and β-cyclodextrin (β-CD) powder samples from co-precipitation (1), evaporation (2), and heating-under-reflux (3) were analysed using X-ray techniques and nuclear magnetic resonance (NMR) spectroscopy. On the basis of NMR studies carried out in an aqueous solution, it was found that in the samples obtained by methods 1 and 2, there were large excesses of β-CD in relation to KP, 10 and 75 times, respectively, while the sample obtained by method 3 contained equimolar amounts of β-CD and KP. NMR results indicated that KP/β-CD inclusion complexes were formed and the estimated binding constants were approximately 2400 M−1, showing that KP is quite strongly associated with β-CD. On the other hand, the X-ray single-crystal technique in the solid state revealed that the (S)-KP/β-CD inclusion complex with a stoichiometry of 2:2 was obtained as a result of heating-under-reflux, for which the crystal and molecular structure were examined. Among the methods used for the preparation of the KP/β-CD complex, only method 3 is suitable.

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