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Complexation of naphthalene-viologen linked compounds with alpha-cyclodextrin: Effect of linkage length on thermodynamic parameters and complex structures

Title
Complexation of naphthalene-viologen linked compounds with alpha-cyclodextrin: Effect of linkage length on thermodynamic parameters and complex structures
Authors
Hwang, HJLee, SPark, JW
Ewha Authors
박준우이상혁
SCOPUS Author ID
박준우scopusscopus; 이상혁scopus
Issue Date
2000
Journal Title
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
ISSN
0253-2964JCR Link
Citation
vol. 21, no. 2, pp. 245 - 250
Publisher
KOREAN CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS; KCI WOS scopus
Abstract
Inclusion complexation between alpha-CD and naphthalene-viologen compounds linked with a flexible polymethylene bridges [-(CH2)(n)-; n = 3, 5, 7, 9, 12] is examined by NMR spectroscopy. Thermodynamic parameters such as equilibrium constants, enthalpy changes, and entropy changes of complexation were obtained. The equilibrium constants increase dramatically as the chain becomes longer. It is shown that the chain-length dependence of the equilibrium constant is dominated mainly by the entropy factor due to the hydrophobic interaction. Effects of intramolecular complexation on the apparent complexation constants are discussed. Structural features of the complex are also examined from chemical shift change and ROESY experiment. The main inclusion site seems to be the aromatic moiety for short chain molecules, and it moves toward the alkyl chain part as the chain becomes longer.
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자연과학대학 > 화학·나노과학전공 > Journal papers
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