Vapor pressure osmometry and conductance studies of solutions of bis(tetraalkylammonium) electrolytes in methanol, ethanol, and 2-propanol.
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概要
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Vapor-pressure depressions and electric conductivities have been measured for bis(tetraalkylammonium) electrolytes in methanol, ethanol, and 2-propanol. The analysis of the data of vapor pressure osmometry (VPO) of these bolaform salts was carried out taking into account the two-step dissociation equilibrium as follows.<BR>M<SUP>2+</SUP>+2X<SUP>－</SUP>\underset<I>K</I><SUB>d</SUB><SUP>I</SUP>\rightleftarrowsMX<SUP>+</SUP>+X<SUP>－</SUP>\underset<I>K</I><SUB>d</SUB><SUP>II</SUP>\rightleftarrowsMX<SUB>2</SUB><BR>In each solvent, the ionic association constants, <I>K</I><SUB>a</SUB><SUP>I</SUP> and <I>K</I><SUB>a</SUB><SUP>II</SUP> (<I>K</I><SUB>a</SUB>=1⁄<I>K</I><SUB>b</SUB>), tend to decrease with increasing ionic size. This tendency is greater in <I>K</I><SUB>a</SUB><SUP>I</SUP> than in <I>K</I><SUB>a</SUB><SUP>II</SUP>. The <I>K</I><SUB>a</SUB><SUP>II</SUP> values of bis(tetraalkylammonium) electrolytes show virtually no dependence on the dielectric constant of solvent. On the contrary, the values of <I>K</I><SUB>a</SUB><SUP>II</SUP> strongly depend on the dielectric constant of solvent. Using the values of <I>K</I><SUB>a</SUB><SUP>I</SUP> and <I>K</I><SUB>a</SUB><SUP>II</SUP> in 2-propanol, the ultrasonic relaxation data were analyzed.
著者
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Lee Ha
Department Of Anatomy Seoul National University College Of Medicine
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Nomura Hiroyasu
Department Of Chemical Engineering Faculty Of Engineering Nagoya University
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Miyahara Yutaka
Department Of Chemical Engineering Faculty Of Engineering Nagoya University
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Miyahara Yutaka
Department of Chemical Engineering, Faculty of Engineering, Nagqya University
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Verrall R.
Department of Chemistry and Chemical Engineeing, University of Saskatchewan
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