ISSN:
1572-8927
Keywords:
Electrolytic conductance
;
molar conductance
;
ion pair formation
;
complex formation
;
18-crown-6
;
calix[4]arene-bis-crown-6
;
lithium perchlorate
;
sodium perchlorate
;
potassium perchlorate
;
rubidium perchlorate
;
cesium perchlorate
;
acetonitrile
;
methanol
;
propylene carbonate
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Résumé The interactions of Li+, Na+, K+, Rb+, and Cs+ with the “double-crown calix,” calix[4]arene-bis-crown-6, have been studied in methanol, acetonitrile, and propylene carbonate at 25°C using precise conductivity measurements. For Li+ and Na+ in solutions containing this calix[4]arene, only 1:1 cation:ligand complexes are formed which permit the determination of the thermodynamic complexation formation constants,K f. The conductivity data strongly suggest that 2:1 cationcalixarene complexes form with K+, Rb+, and Cs+. The existence of 2:1 complexes was experimentally confirmed for the potassium systems by a mass spectroscopic method.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00972592
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