Abstract
A thermodynamic study of the association of Na+, K+, Rb+, and Cs+ with dicyclohexano-18-crown-6 in acetonitrile has been carried out at 308, 303, 298, 293, and 288 K using a conductometric technique. The observed molar conductivities, A, were found to decrease significantly for mole ratios less than unity. A model involving 1∶1 stoichiometry has been used to analyze the conductivity data. The stability constant,K, and the limiting molar conductivity, A c , for each 1∶1 complex were determined from the conductivity data by using a nonlinear least squares curve fitting procedure. The binding sequence, based on the value of logK at 298 K, as derived from this study is K+>Na+>Rb+>Cs+. Values of ΔH o and ΔS o are reported and their significance is discussed.
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