EFFECT OF SOLVENT COMPOSITION ON IONIC MOBILITIES OF SOME TETRAALKYLAMMONIUM AND COMMON IONS IN PROPYLENE CARBONATE PLUS METHANOL MEDIA AT 25-DEGREES-C
Pk. Muhuri et Dk. Hazra, EFFECT OF SOLVENT COMPOSITION ON IONIC MOBILITIES OF SOME TETRAALKYLAMMONIUM AND COMMON IONS IN PROPYLENE CARBONATE PLUS METHANOL MEDIA AT 25-DEGREES-C, Zeitschrift für physikalische Chemie, 190, 1995, pp. 111-122
Citations number
37
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Precise conductance measurements are reported for tetraalkylammonium b
romides, R(4)NBr (R = methyl to heptyl), sodium tetraphenylborate (NaB
Ph(4)) and tetrabutylammonium tetraphenylborate (Bu(4)NBPh(4)) in bina
ry mixtures of propylene carbonate (PC) and methanol at four different
mole fractions viz. 0.1, 0.2, 0.4 and 0.6 of PC. The conductance data
have been analyzed by the 1978 Fuoss conductance equation in terms of
the limiting molar conductance, Lambda(0), the Walden product, Lambda
(0) eta(0), and the association constant, K-A. Single ion conductances
have been determined using Bu(4)NBPh(4) as the ''reference electrolyt
e''. The K-A values indicate the possibility of ionic association for
these salts in this protic-dipolar aprotic solvent mixtures. Evaluatio
n of Stokes radii shows that the tetraalkylammonium ions remain almost
unsolvated over the whole composition range of the mixtures, whereas
the Na+ ion is highly solvated at all percentages of the mixed solvent
s, and the Br- ion shows solvational behaviour only at low PC content
in the mixture.