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The Inclusion Complex Formation of Cyclodextrin and Congo Red in Aqueous Solution
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2002, v.15 no.2, pp.115-119
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(2002). The Inclusion Complex Formation of Cyclodextrin and Congo Red in Aqueous Solution. Analytical Science and Technology, 15(2), 115-119.
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Abstract
The formation of inclusion complexes between cyclodextrin(CD) and Congo red was studied by spectrophotometric methods at various temperatures. The cavity sizes are 0.49 nm, 0.62 nm for <TEX>$\alpha$</TEX>-and <TEX>$\beta$</TEX>-CD, respectively. Therefore, <TEX>$\alpha$</TEX>-CD was not found to form an inclusion complex with Congo red due to steric hinderance. In the <TEX>$\beta$</TEX>-CD use two <TEX>$\beta$</TEX>-CD molecules formed an inclusion complex with one molecule of Congo red, from the slope of the S-shaped curve increased. Two prominent isosbestic points appear at 346 nm and 478 nm. The formation constants were decreased with the increasing temperatures, due to low binding energy between <TEX>$\beta$</TEX>-CD and Congo red. The thermodynamic parameters were calculated from the plot of <TEX>$lnK_f$</TEX> vs 1/T. The <TEX>$\Delta$</TEX>H, <TEX>$\Delta$</TEX>S and <TEX>$\Delta$</TEX>G were -50.73 kJ/mol, <TEX>$-108.96J/K{\cdot}mol$</TEX> and -18.26 kJ/mol, respectively.
- keywords
- host, guest, cyclodextrin, absorbance, inclusion complex, congo red
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