J. Nath, ULTRASONIC VELOCITIES, RELATIVE PERMITTIVITIES AND REFRACTIVE-INDEXESFOR BINARY-LIQUID MIXTURES OF TRICHLOROETHENE WITH PYRIDINE AND QUINOLINE, Fluid phase equilibria, 109(1), 1995, pp. 39-51
Ultrasonic velocities, u, relative permittivities, epsilon, and refrac
tive indices, n, have been measured for binary liquid mixtures of tric
hloroethene (CHClCCl2) with pyridine (C5H5N) and quinoline (C9H7N) at
303.15 K. The relative-permittivity data have been used to calculate t
otal molar polarisations, P, for the various systems. The quantities D
elta k(s) and Delta P which refer, respectively, to the deviations of
the isentropic compressibilities and total molar polarisations of the
mixtures from the values arising from the mole fraction mixture law, h
ave been calculated. The apparent molar polarisations, P-D, of C5H5N a
nd C9H7N have also been calculated in CHClCCl2. The values of Delta k(
s), Delta P and P-D show that CHClCCl2 forms intermolecular complexes
with C5H5N and C9H7N in the liquid state. The values of the equilibriu
m constant, K-f, for the formation of 1:1 complexes of CHClCCl2 with C
5H5N and C9H7N, as calculated using relative permittivity data, are in
accord with the theory based upon electrostatic interactions of the s
olute with the liquid.