Conductimetric studies of ionic association of tetraalkylammonium halides and tetraphenylborate in N,N-dimethylformamide-methyl ethyl ketone mixtures at 25.DEG.C.
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概要
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The molar conductivities of Et<SUB>4</SUB>NBr, <I>n</I>-Pr<SUB>4</SUB>NBr, <I>n</I>-Bu<SUB>4</SUB>NBr, and <I>n</I>-Bu<SUB>4</SUB>NBPh<SUB>4</SUB> have been measured in <I>N</I>,<I>N</I>-dimethylformamide–methyl ethyl ketone (DMF–MEK) mixtures (34.5<I>≥D≥</I>20.10) over the maximum concentration range (2×D<SUP>3</SUP>×10<SUP>−7</SUP> mol dm<SUP>−3</SUP>) along with the densities and viscosities of the solvent mixtures at 25 °C. The conductance data have been analyzed by using the Fuoss-1978 (F78) conductance equation and the results compared with those obtained from the Justice (J) and the Fuoss-Onsager-Skinner (FOS) equations. The molar conductivities at infinite dilution (<I>Λ</I><SUB>0</SUB>), the thermodynamic association constant (<I>K</I><SUB>A</SUB>) and the distance or the ion-size parameter (<I>R</I> or <I>a</I>°) are evaluated from these data. A better fit of the parameters was provided by the F78 equation which yielded <I>K</I><SUB>A</SUB> and <I>R</I> values. The <I>Λ</I><SUB>0</SUB> and the <I>K</I><SUB>A</SUB> values are found to increase with decrease in the dielectric constant of the medium and in a given solvent mixture they follow the order Et<SUB>4</SUB>NBr><I>n</I>-Pr<SUB>4</SUB>NBr><I>n</I>-Bu<SUB>4</SUB>NBr><I>n</I>-Bu<SUB>4</SUB>NBPh<SUB>4</SUB>.
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著者
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Ansari Aijaz
Department of Chemistry, Aligarh Muslim University
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Islam Nurul
Department of Chemistry, Aligarh Muslim University
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Zaidi S.
Department of Chemistry, Aligarh Muslim University