Thermochemical behaviour of crown ethers in the mixtures of water with organic solvents -: Part VI.: Enthalpy of solution of 12-crown-4 and 18-crown-6 in the mixtures of water with hexamethylphosphortriamide at 298.15 K

被引：10
|
作者：
Józwiak, M [1 ]
机构：
[1] Univ Lodz, Dept Phys Chem, PL-90236 Lodz, Poland
来源：
THERMOCHIMICA ACTA | 2004年 / 413卷 / 1-2期
关键词：
crown ethers; enthalpy of solution; water-hexamethylphosphortriamide mixture; hydrophobic properties; preferential solvation;
D O I：
10.1016/j.tca.2003.11.007
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Enthalpies of solution of crown ethers (12-crown-4 (12C4) and 18-crown-6 ethers (18C6)) in the water-hexamethylphosphortriamide (HMPA) mixture and of hexamethylphosphortriamide in the mixtures of water with dimethylsulfoxide (DMSO) and N,N-dimethylformamide (DMF) have been measured within the whole mole fraction range at 298.15 K. From the results obtained, it follows that 12-crown-4 ether shows weaker and 18-crown-6 ether stronger hydrophobic properties than hexamethylphosphortriamide as shown by the curve of dissolution enthalpy 12-crown-4 and 18-crown-6 ethers in the mixture of water and dimethylsulfoxide, N,N-dimethylformamide or hexamethylphosphortriamide as well as by the preferential solvation of crown ether molecules by hexamethylphosphortriamide molecules. (C) 2003 Elsevier B.V. All rights reserved.
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页码：17 / 22
页数：6
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