Journal of the American Chemical Society p. 6895 - 6899 (1982)
Update date:2022-08-11
Topics:
Michaux, Gabriel
Reisse, Jacques
The interactions of 18-crown-6, 15-crown-5, and 12-crown-4 with Na+ and K+ were studied in methanol and water as solvents at 25 deg C. ΔG0 values for both 1:1 and 2:1 complexation reactions were determined by potentiometric titrations.Used in conjunction with these values, calorimetric measurements led to ΔH0 and ΔS0 values.The thermodynamic parameters obtained cannot be correlated with the cations or the crown ethers "hole" sizes in any 1:1 or 2:1 reactions.Moreover, the ΔG0 values are the results of quite different but permanently compensating combinations of the ΔH0 and ΔS0 values.These arise from several thermodynamic processes in which the role of the solvent must be considered.In the case of 18-crown-6, we present a quantitative interpretation in which this crown ether develops interactions that are stronger with Na+ than with K+.
View MoreWuxi Forest Biological Co.,Ltd
Contact:+86-510-81602300
Address:Room 317,Building D, No.159 middle Chengjiang Road,Jiangyin Wuxi city.
Contact:+86 512 6287 2180
Address:398 Ruoshui Road, Suzhou Industrial Park, Suzhou, Jiangsu, P. R. China
Jingzhou TianHe Sci&Tech Chemical Co., Ltd.
Contact:86-716-8331612
Address:Jiangjin Road, #18, High-grade technology industries development district, Jingzhou city, Hubei province
LinHai Cina Chemical Co., LTD.
Contact:0576-85580989
Address:Pharma-chem zone,Duqiao,Linhai,Zhejiang,China
ShiJiaZhuang Dowell Chemical Co.,Ltd.
website:http://www.dowechem.com
Contact:+86-13463963265,+86-311-89805679
Address:Xiyangling village, high tech Zone, Shijiazhuang,Hebei, China
Doi:10.1021/jo00283a019
(1989)Doi:10.1007/s00706-013-1007-6
(2013)Doi:10.1016/j.crci.2014.01.011
(2014)Doi:10.1246/cl.1986.1381
(1986)Doi:10.1016/S0040-4039(00)85651-8
(1982)Doi:10.1016/S0039-6028(03)00192-4
(2003)