Ion-solvent interactions of silver(I)-18-crown-6 perchlorate complex in methanol-acetonitrile mixtures |
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Authors: | C Kalidas R Raghunath |
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Institution: | (1) Department of Chemistry, Indian Institute of Technology, 36 Madras, India |
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Abstract: | The standard Gibbs transfer energies of the silver(I)-18-crown-6 perchlorate complex salt from methanol to various compositions of methanol-acetonitrile mixtures were determined from solubility measurements at 30°C and these data were separated into the corresponding ionic contributions by employing the negligible liquid junction potential method of Parkeret al. The solvent transport numbers AN, for the salt were also determined at various solvent compositions using a concentration cell with transference.The Gibbs transfer energy of the silver(I)-18-crown-6 complex cation is negative and decreases with the addition of acetonitrile but the transfer energy of the anion is positive and increases under the same conditions. The solvent transport number, AN, increases and passes through a maximum value of 5.48 at AN=0.55. These results indicate that the complex salt is heteroselectively solvated in these mixtures with the cation being preferentially solvated by acetonitrile and the anion by methanol molecules. |
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Keywords: | Silver(I)-18-crown-6 perchlorate complex selective solvation methanol-acetonitrile mixtures Gibbs transfer energies solvent transport numbers |
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