Abstract
A conductance study concerning the association of Na+, K+, Rb+, and Cs+ with 1,13-dibenzo-24-crown-8 in acetonitrile has been carried out at 35, 30, 25, 20, and 15°C. The observed molar conductivities Λ 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 molar conductivity ΛC 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 log K at 25°C, is found to be Rb+>Cs+>K+>Na+. Values of ΔHo and ΔSo are reported and their significance is discussed.
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