TY - JOUR
T1 - Complexation of naphthalene-viologen linked compounds with α- cyclodextrin
T2 - Effect of linkage length on thermodynamic parameters and complex structures
AU - Hwang, Hee Jung
AU - Lee, Sanghyuk
AU - Park, Joon Woo
PY - 2000/2/20
Y1 - 2000/2/20
N2 - Inclusion complexation between α-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.
AB - Inclusion complexation between α-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.
UR - http://www.scopus.com/inward/record.url?scp=0011719416&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0011719416
SN - 0253-2964
VL - 21
SP - 245
EP - 250
JO - Bulletin of the Korean Chemical Society
JF - Bulletin of the Korean Chemical Society
IS - 2
ER -