The Inclusion Complex Formation of Cyclodextrin and Congo Red in Aqueous Solution

김창석; 김동원; 반우경

오늘 하루 그만보기

P-ISSN1225-0163
E-ISSN2288-8985
SCOPUS, ESCI, KCI

Home

Browse Articles

Article Detail

Home > Article Detail

P-ISSN 1225-0163
E-ISSN 2288-8985

e-Submission

Vol.15, No.2

PubReader PDF Citation

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

& (2002). The Inclusion Complex Formation of Cyclodextrin and Congo Red in Aqueous Solution. , 15(2), 115-119.

copy

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 $\alpha$-and $\beta$-CD, respectively. Therefore, $\alpha$-CD was not found to form an inclusion complex with Congo red due to steric hinderance. In the $\beta$-CD use two $\beta$-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 $\beta$-CD and Congo red. The thermodynamic parameters were calculated from the plot of $lnK_f$ vs 1/T. The $\Delta$H, $\Delta$S and $\Delta$G were -50.73 kJ/mol, $-108.96J/K{\cdot}mol$ and -18.26 kJ/mol, respectively.