Journal
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
Volume 55, Issue 2, Pages 377-384Publisher
CHINESE CHEMICAL SOC
DOI: 10.1002/jccs.200800055
Keywords
ammonioum-crown ether complexation; conductance; nonaqueos solvent; thermodynamic study
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A conductance study of the interaction between ammonium ion and 18-Crown-6 (18C6), dicyclohexano- 18-crown-6 (DC18C6), ditertbutyl-dicyclohexano-18-crown-6 (t-bu)(2)DC18C6, diaza-15-crown-5 (DA 15C5), dibenzo-21-crown-7 (DB21C7) and N-Phenylaza-15-crown-5 (NPA 15C5) in acetonitril-dimethylsulfoxide mixture was carried out at various temperatures. The formation constants of the resultant 1:1 complexes were determined from the molar conductance-mole ratio data and found to vary in the order of DA 15C5 > DC 18C6 > 18C6 > (t-bu)(2)DC 18C6 > DB21C7 > NPA 15C5. The enthalpy and entropy of the complexation reactions were determined from the temperature dependence of the formation constants.
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