Thermodynamics of Solvation of 18-Crown-6 and Its Alkali-Metal Complexes in Various Solvents

被引：0
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作者：
Kumiko Ohtsu
Kazuhiko Ozutsumi
机构：
[1] University of Tsukuba,Laboratory of Analytical Chemistry, Department of Chemistry
[2] Ritsumeikan University,Department of Applied Chemistry, Faculty of Science and Engineering
来源：
Journal of inclusion phenomena and macrocyclic chemistry | 2003年 / 45卷
关键词：
alkali-metal complexes; aprotic solvents; 18-crown-6; enthalpies of transfer; solvent effect on complexation; water;
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摘要：
Heats of solution of 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6) in acetonitrile, 1,2-dichloroethane, N,N-dimethylformamide, dimethyl sulfoxide, nitromethane, propylene carbonate, pyridine and water were measured at 25 °C and the enthalpies of the transfer of 18-crown-6 from waterto the aprotic solvents were derived. The thermodynamic quantities, Δ G1°, Δ H1° and TΔ S1°, for the formation of the[M(18-crown-6)]+ (M+ = Na+, K+, Rb+, Cs+, NH4+) complexeswere determined by titration calorimetry in dimethyl sulfoxide containing0.1 mol dm-3 (C2H5)4NClO4 as a constant ionic medium at 25 °C. These thermodynamic quantities suggest that the complexationof 18-crown-6 with the alkali-metal ions mainly reflects the different solvationof 18-crown-6 and also the different degree of solvent structure.
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页码：217 / 224
页数：7
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