A conductance study of the association of alkali cations with 1,13-dibenzo-24-crown-8 in acetonitrile |
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Authors: | K. M. Tawarah S. A. Mizyed |
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Affiliation: | (1) Department of Chemistry, Yarmouk University, Irbid, Jordan |
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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 were found to decrease significantly for mole ratios less than unity. A model involving 11 stoichiometry has been used to analyze the conductivity data. The stability constant, K, and the molar conductivity C for each 11 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 Ho and So are reported and their significance is discussed. |
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Keywords: | Dibenzo-24-crown-8 electrolytic conductance alkali cations thermodynamic study crown ethers |
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