TETRAALKYLAMMONIUM BROMIDES IN METHANOL - SMALL-ANGLE NEUTRON-SCATTERING AND VAPOR-PRESSURE MEASUREMENTS

Vapor pressure measurements and small angle scattering (SANS) experiments are reported and discussed for bispiperidinium (BP) bromide and n-tetrupentylammonium bromide solutions in methanol at 25 degrees C. The BP(+)ion which may be considered as a tetraalkylammonium (TAA) ion with pairwise connected alkyl chains, is used for the study of the effects due to flexible TAA alkyl chains. SANS intensities are calibrated with the help of the precise osmotic coefficients from the vapor pressure measurements.