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首页> 外文期刊>Indian Journal of Chemistry, Section A. Inorganic, Physical, Theoretical & Analytical >Conductance studies of alkali iodides in mixed organic solvents II: Conductance measurements in N,N-dimethylformamide-ethanol mixed solvents
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Conductance studies of alkali iodides in mixed organic solvents II: Conductance measurements in N,N-dimethylformamide-ethanol mixed solvents

机译：混合有机溶剂中碱性碘化物的电导研究II：在N，N-二甲基甲酰胺-乙醇混合溶剂中的电导率测量

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摘要

Limiting ionic conductivities for Na~+, K~+ and Cs~+ ions have been obtained at 25 deg C in mixtures of ethanol and N, N-dimethylformamide over the entire solvent composition range and in the pure solvents. Variations in limiting ionic conductivities for the ions have been observed as the mole fraction of ethanol in the mixed solvents varied. These variations show a maximum at the solvent composition of near 0.8 mole fraction of ethanol in the mixed solvents for the three ions. Using Nightingale's modification of the Robinson-Stokes treatment, the radii of the solvated ions in the various solvent systems have been calculated and the solvation numbers of Na~+, K~+ and Cs~+ in the various solvents calculated therefrom. The solvation numbers of Na~+, K~+ and Cs~+ range between 2.37-2.38, 2.23-2.73 and 1.89-2.43 respectively in the various solvent mixtures. Plots of the solvation numbers as a function of solvent composition show a solvation numbers as a function of solvent composition show a minimum at about 0.80 ethanol mole fraction which coincides with the maximum in the limiting ionic condutivities. The results of the study suggest that ion-solvent intractions which account for the extent of solvation of the ions is the dominant factor which influences the conductance behaviour of Na~+, K~+ and Cs~+ ions in N,N-dimethylforamide-ethanol mixed solvents. Factors such as solvent vis-cosities and densities appear to play less dominant roles.
机译：在乙醇和N，N-二甲基甲酰胺的混合物中，在整个溶剂组成范围内和在纯溶剂中，在25℃下，已获得Na +，K +和Cs +离子的极限离子电导率。随着乙醇在混合溶剂中的摩尔分数的变化，已经观察到离子的极限离子电导率的变化。这些变化表明，对于三种离子而言，在混合溶剂中，在溶剂组成中，乙醇的最大值约为0.8摩尔分数。使用Nightingale对Robinson-Stokes处理的改进，已计算出各种溶剂体系中的溶剂化离子的半径，并由此计算出了各种溶剂中Na〜+，K〜+和Cs〜+的溶剂化数。在各种溶剂混合物中，Na〜+，K〜+和Cs〜+的溶剂化数分别在2.37-2.38、2.23-2.73和1.89-2.43之间。作为溶剂组成的函数的溶剂化数图显示，作为溶剂组成的函数的溶剂化数在约0.80乙醇摩尔分数下显示出最小值，这与极限离子电导率中的最大值一致。研究结果表明，影响溶剂化程度的离子溶剂迁移是影响Na，+，K〜+和Cs〜+离子在N，N-二甲基甲酰胺-中电导行为的主导因素。乙醇混合溶剂。溶剂粘度和密度等因素似乎起着较少的主导作用。

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