Conductance study of some transition and heavy metal complexes with 1,10-diaza-18-crown-6 in binary acetonitrile-dimethylsulfoxide mixtures |
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Authors: | Jahanbakhsh Ghasemi Mojtaba Shamsipur |
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Affiliation: | (1) Department of Chemistry, Shiraz University, Shiraz, Iran |
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Abstract: | A conductance study of the interaction between cobalt, nickel, copper, zinc, cadmium, and lead ions with 1,10-diaza-18-crown-6 in different acetonitrile-dimethylsulfoxide mixtures has been carried out at various temperatures. The formation constants of the resulting 1 1 complexes were determined from the molar conductance-mole ratio data and found to vary in the order Zn2+2+2+2+2+2+. The enthalpy and entropy of complexation reactions were determined from the temperature dependence of the formation constants. A linear relationship is observed between the log Kf of different complexes and mole fraction of acetonitrile in the solvent mixtures. The T S vs. H plot of all thermodynamic data obtained shows a fairly good linear correlation indicating the existence of an enthalpy-entropy compensation in the complexation reactions. |
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Keywords: | 1,10-Diaza-18-crown-6 transition and heavy metal ions mixed solvent conduetance complex stability enmalpy-entropy compensation acetonitrile, dimethylsulfoxide |
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